Move useful printing backend code from chrome/service/cloud_print to printing/backend.

BUG=none
TEST=none
Review URL: http://codereview.chromium.org/3945003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@63772 0039d316-1c4b-4281-b951-d872f2087c98

26 files changed, 790 insertions, 446 deletions

diff --git a/build/common.gypi b/build/common.gypi
index 9f87a44..4d5836e 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -392,6 +392,11 @@
           'NACL_WIN64',
         ],
       }],
+      ['OS=="linux" and chromeos==0 and target_arch!="arm"', {
+        'use_cups%': 1,
+      }, {
+        'use_cups%': 0,
+      }],
     ],
 
     # NOTE: When these end up in the Mac bundle, we need to replace '-' for '_'
diff --git a/chrome/chrome.gyp b/chrome/chrome.gyp
index 3a414cd..d306fdc 100644
--- a/chrome/chrome.gyp
+++ b/chrome/chrome.gyp
@@ -1148,15 +1148,6 @@
       'include_dirs': [
         '..',
       ],
-      'variables': {
-        'conditions': [
-          ['OS=="linux" and chromeos==0 and target_arch!="arm"', {
-            'use_cups%': 1,
-          }, {
-            'use_cups%': 0,
-          }],
-        ],
-      },
       'conditions': [
         ['OS=="win"', {
           'defines': [
diff --git a/chrome/service/cloud_print/cloud_print_consts.cc b/chrome/service/cloud_print/cloud_print_consts.cc
index 0974205..7513875 100644
--- a/chrome/service/cloud_print/cloud_print_consts.cc
+++ b/chrome/service/cloud_print/cloud_print_consts.cc
@@ -28,8 +28,6 @@ const char kPrinterCapsHashValue[] = "capsHash";
 const char kPrinterTagsValue[] = "tags";
 const char kProxyTagPrefix[] = "__cp__";
 const char kTagsHashTagName[] = "__cp__tagshash";
-const char kLocationTagName[] = "location";
-const char kDriverNameTagName[] = "drivername";
 
 
 const char kDefaultCloudPrintServerUrl[] = "https://www.google.com/cloudprint";
diff --git a/chrome/service/cloud_print/cloud_print_consts.h b/chrome/service/cloud_print/cloud_print_consts.h
index 0e98b94..532f717 100644
--- a/chrome/service/cloud_print/cloud_print_consts.h
+++ b/chrome/service/cloud_print/cloud_print_consts.h
@@ -30,8 +30,6 @@ extern const char kPrinterCapsHashValue[];
 extern const char kPrinterTagsValue[];
 extern const char kProxyTagPrefix[];
 extern const char kTagsHashTagName[];
-extern const char kLocationTagName[];
-extern const char kDriverNameTagName[];
 extern const char kDefaultCloudPrintServerUrl[];
 extern const char kGaiaUrl[];
 extern const char kCloudPrintGaiaServiceId[];
diff --git a/chrome/service/cloud_print/cloud_print_proxy.cc b/chrome/service/cloud_print/cloud_print_proxy.cc
index f2fa628..4141b2d 100644
--- a/chrome/service/cloud_print/cloud_print_proxy.cc
+++ b/chrome/service/cloud_print/cloud_print_proxy.cc
@@ -12,6 +12,7 @@
 #include "chrome/common/pref_names.h"
 #include "chrome/common/json_pref_store.h"
 #include "chrome/service/cloud_print/cloud_print_consts.h"
+#include "chrome/service/cloud_print/print_system.h"
 #include "chrome/service/service_process.h"
 
 // This method is invoked on the IO thread to launch the browser process to
@@ -133,7 +134,7 @@ void CloudPrintProxy::Shutdown() {
 
 // Notification methods from the backend. Called on UI thread.
 void CloudPrintProxy::OnPrinterListAvailable(
-    const cloud_print::PrinterList& printer_list) {
+    const printing::PrinterList& printer_list) {
   DCHECK(CalledOnValidThread());
   // We could potentially show UI here allowing the user to select which
   // printers to register. For now, we just register all.
@@ -163,4 +164,3 @@ void CloudPrintProxy::OnAuthenticationFailed() {
   g_service_process->io_thread()->message_loop_proxy()->PostTask(
       FROM_HERE, NewRunnableFunction(&ShowTokenExpiredNotificationInBrowser));
 }
-
diff --git a/chrome/service/cloud_print/cloud_print_proxy.h b/chrome/service/cloud_print/cloud_print_proxy.h
index cccf2b4..36399ca 100644
--- a/chrome/service/cloud_print/cloud_print_proxy.h
+++ b/chrome/service/cloud_print/cloud_print_proxy.h
@@ -46,7 +46,7 @@ class CloudPrintProxy : public CloudPrintProxyFrontend,
 
   // Notification methods from the backend. Called on UI thread.
   virtual void OnPrinterListAvailable(
-      const cloud_print::PrinterList& printer_list);
+      const printing::PrinterList& printer_list);
   virtual void OnAuthenticated(const std::string& cloud_print_token,
                                const std::string& cloud_print_xmpp_token,
                                const std::string& email);
@@ -72,4 +72,3 @@ class CloudPrintProxy : public CloudPrintProxyFrontend,
 };
 
 #endif  // CHROME_SERVICE_CLOUD_PRINT_CLOUD_PRINT_PROXY_H_
-
diff --git a/chrome/service/cloud_print/cloud_print_proxy_backend.cc b/chrome/service/cloud_print/cloud_print_proxy_backend.cc
index d30160e..ac4e110 100644
--- a/chrome/service/cloud_print/cloud_print_proxy_backend.cc
+++ b/chrome/service/cloud_print/cloud_print_proxy_backend.cc
@@ -4,6 +4,9 @@
 
 #include "chrome/service/cloud_print/cloud_print_proxy_backend.h"
 
+#include <map>
+#include <vector>
+
 #include "base/file_util.h"
 #include "base/md5.h"
 #include "base/rand_util.h"
@@ -17,11 +20,10 @@
 #include "chrome/service/cloud_print/printer_job_handler.h"
 #include "chrome/service/gaia/service_gaia_authenticator.h"
 #include "chrome/service/service_process.h"
+#include "googleurl/src/gurl.h"
 #include "jingle/notifier/base/notifier_options.h"
 #include "jingle/notifier/listener/push_notifications_thread.h"
 #include "jingle/notifier/listener/talk_mediator_impl.h"
-
-#include "googleurl/src/gurl.h"
 #include "net/url_request/url_request_status.h"
 
 // The real guts of CloudPrintProxyBackend, to keep the public client API clean.
@@ -58,7 +60,7 @@ class CloudPrintProxyBackend::Core
   // shutdown.
   void DoShutdown();
   void DoRegisterSelectedPrinters(
-      const cloud_print::PrinterList& printer_list);
+      const printing::PrinterList& printer_list);
 
   // URLFetcher::Delegate implementation.
   virtual void OnURLFetchComplete(const URLFetcher* source, const GURL& url,
@@ -103,7 +105,7 @@ class CloudPrintProxyBackend::Core
   // NotifyXXX is how the Core communicates with the frontend across
   // threads.
   void NotifyPrinterListAvailable(
-      const cloud_print::PrinterList& printer_list);
+      const printing::PrinterList& printer_list);
   void NotifyAuthenticated(
     const std::string& cloud_print_token,
     const std::string& cloud_print_xmpp_token,
@@ -149,7 +151,7 @@ class CloudPrintProxyBackend::Core
   // registered. We then pass a copy of this list to the frontend to give the
   // user a chance to further trim the list. When the frontend gives us the
   // final list we make a copy into this so that we can start registering.
-  cloud_print::PrinterList printer_list_;
+  printing::PrinterList printer_list_;
   // The URLFetcher instance for the current request
   scoped_ptr<URLFetcher> request_;
   // The index of the nex printer to be uploaded.
@@ -164,7 +166,7 @@ class CloudPrintProxyBackend::Core
   // so we won't have to requery the printer if the upload fails and we need
   // to retry.
   std::string last_uploaded_printer_name_;
-  cloud_print::PrinterCapsAndDefaults last_uploaded_printer_info_;
+  printing::PrinterCapsAndDefaults last_uploaded_printer_info_;
   // A map of printer id to job handler.
   typedef std::map<std::string, scoped_refptr<PrinterJobHandler> >
       JobHandlerMap;
@@ -235,7 +237,7 @@ void CloudPrintProxyBackend::Shutdown() {
 }
 
 void CloudPrintProxyBackend::RegisterPrinters(
-    const cloud_print::PrinterList& printer_list) {
+    const printing::PrinterList& printer_list) {
   core_thread_.message_loop()->PostTask(FROM_HERE,
       NewRunnableMethod(
           core_.get(),
@@ -344,7 +346,7 @@ void CloudPrintProxyBackend::Core::DoInitializeWithToken(
 void CloudPrintProxyBackend::Core::StartRegistration() {
   DCHECK(MessageLoop::current() == backend_->core_thread_.message_loop());
   printer_list_.clear();
-  print_system_->EnumeratePrinters(&printer_list_);
+  print_system_->GetPrintBackend()->EnumeratePrinters(&printer_list_);
   server_error_count_ = 0;
   // Now we need to ask the server about printers that were registered on the
   // server so that we can trim this list.
@@ -381,7 +383,7 @@ void CloudPrintProxyBackend::Core::DoShutdown() {
 }
 
 void CloudPrintProxyBackend::Core::DoRegisterSelectedPrinters(
-    const cloud_print::PrinterList& printer_list) {
+    const printing::PrinterList& printer_list) {
   DCHECK(MessageLoop::current() == backend_->core_thread_.message_loop());
   if (!print_system_.get())
     return;  // No print system available.
@@ -409,14 +411,15 @@ void CloudPrintProxyBackend::Core::RegisterNextPrinter() {
   // For the next printer to be uploaded, create a multi-part post request to
   // upload the printer capabilities and the printer defaults.
   if (next_upload_index_ < printer_list_.size()) {
-    const cloud_print::PrinterBasicInfo& info =
+    const printing::PrinterBasicInfo& info =
         printer_list_.at(next_upload_index_);
     bool have_printer_info = true;
     // If we are retrying a previous upload, we don't need to fetch the caps
     // and defaults again.
     if (info.printer_name != last_uploaded_printer_name_) {
-      have_printer_info = print_system_->GetPrinterCapsAndDefaults(
-          info.printer_name.c_str(), &last_uploaded_printer_info_);
+      have_printer_info =
+          print_system_->GetPrintBackend()->GetPrinterCapsAndDefaults(
+              info.printer_name.c_str(), &last_uploaded_printer_info_);
     }
     if (have_printer_info) {
       last_uploaded_printer_name_ = info.printer_name;
@@ -536,7 +539,7 @@ void CloudPrintProxyBackend::Core::OnURLFetchComplete(
 }
 
 void CloudPrintProxyBackend::Core::NotifyPrinterListAvailable(
-    const cloud_print::PrinterList& printer_list) {
+    const printing::PrinterList& printer_list) {
   DCHECK(MessageLoop::current() == backend_->frontend_loop_);
   backend_->frontend_->OnPrinterListAvailable(printer_list);
 }
@@ -617,7 +620,7 @@ void CloudPrintProxyBackend::Core::InitJobHandlerForPrinter(
       printer_info_cloud.printer_id);
   // We might already have a job handler for this printer
   if (index == job_handler_map_.end()) {
-    cloud_print::PrinterBasicInfo printer_info;
+    printing::PrinterBasicInfo printer_info;
     printer_data->GetString(kNameValue, &printer_info.printer_name);
     DCHECK(!printer_info.printer_name.empty());
     printer_data->GetString(kPrinterDescValue,
@@ -635,7 +638,7 @@ void CloudPrintProxyBackend::Core::InitJobHandlerForPrinter(
         if (StartsWithASCII(tag, kTagsHashTagName, false)) {
           std::vector<std::string> tag_parts;
           base::SplitStringDontTrim(tag, '=', &tag_parts);
-          DCHECK(tag_parts.size() == 2);
+          DCHECK_EQ(tag_parts.size(), 2U);
           if (tag_parts.size() == 2)
             printer_info_cloud.tags_hash = tag_parts[1];
         }
@@ -695,7 +698,7 @@ void CloudPrintProxyBackend::Core::HandleServerError(Task* task_to_retry) {
 bool CloudPrintProxyBackend::Core::RemovePrinterFromList(
     const std::string& printer_name) {
   DCHECK(MessageLoop::current() == backend_->core_thread_.message_loop());
-  for (cloud_print::PrinterList::iterator index = printer_list_.begin();
+  for (printing::PrinterList::iterator index = printer_list_.begin();
        index != printer_list_.end(); index++) {
     if (0 == base::strcasecmp(index->printer_name.c_str(),
                               printer_name.c_str())) {
@@ -758,4 +761,3 @@ void CloudPrintProxyBackend::Core::OnAuthError() {
   backend_->frontend_loop_->PostTask(FROM_HERE, NewRunnableMethod(this,
       &Core::NotifyAuthenticationFailed));
 }
-
diff --git a/chrome/service/cloud_print/cloud_print_proxy_backend.h b/chrome/service/cloud_print/cloud_print_proxy_backend.h
index e5a82c7..931fd91 100644
--- a/chrome/service/cloud_print/cloud_print_proxy_backend.h
+++ b/chrome/service/cloud_print/cloud_print_proxy_backend.h
@@ -9,9 +9,9 @@
 #include <string>
 
 #include "base/thread.h"
-#include "chrome/service/cloud_print/print_system.h"
 #include "chrome/common/net/url_fetcher.h"
 #include "googleurl/src/gurl.h"
+#include "printing/backend/print_backend.h"
 
 class CloudPrintProxyService;
 class DictionaryValue;
@@ -27,7 +27,7 @@ class CloudPrintProxyFrontend {
 
   // There is a list of printers available that can be registered.
   virtual void OnPrinterListAvailable(
-      const cloud_print::PrinterList& printer_list) = 0;
+      const printing::PrinterList& printer_list) = 0;
   // We successfully authenticated with the cloud print server. This callback
   // allows the frontend to persist the tokens.
   virtual void OnAuthenticated(const std::string& cloud_print_token,
@@ -59,7 +59,7 @@ class CloudPrintProxyBackend {
                            const std::string email,
                            const std::string& proxy_id);
   void Shutdown();
-  void RegisterPrinters(const cloud_print::PrinterList& printer_list);
+  void RegisterPrinters(const printing::PrinterList& printer_list);
 
  private:
   // The real guts of SyncBackendHost, to keep the public client API clean.
@@ -82,4 +82,3 @@ class CloudPrintProxyBackend {
 };
 
 #endif  // CHROME_SERVICE_CLOUD_PRINT_CLOUD_PRINT_PROXY_BACKEND_H_
-
diff --git a/chrome/service/cloud_print/print_system.cc b/chrome/service/cloud_print/print_system.cc
index 57c1342..f15d6b8 100644
--- a/chrome/service/cloud_print/print_system.cc
+++ b/chrome/service/cloud_print/print_system.cc
@@ -6,10 +6,6 @@
 
 namespace cloud_print {
 
-PrinterBasicInfo::PrinterBasicInfo() : printer_status(0) {}
-
-PrinterBasicInfo::~PrinterBasicInfo() {}
-
 PrintJobDetails::PrintJobDetails()
     : status(PRINT_JOB_STATUS_INVALID),
       platform_status_flags(0),
diff --git a/chrome/service/cloud_print/print_system.h b/chrome/service/cloud_print/print_system.h
index 2abdcc3..c6949bd 100644
--- a/chrome/service/cloud_print/print_system.h
+++ b/chrome/service/cloud_print/print_system.h
@@ -15,30 +15,16 @@
 class DictionaryValue;
 class FilePath;
 
+namespace printing {
+class PrintBackend;
+struct PrinterBasicInfo;
+}
+
 // This is the interface for platform-specific code for cloud print
 namespace cloud_print {
 
 typedef int PlatformJobId;
 
-struct PrinterBasicInfo {
-  PrinterBasicInfo();
-  ~PrinterBasicInfo();
-
-  std::string printer_name;
-  std::string printer_description;
-  int printer_status;
-  std::map<std::string, std::string> options;
-};
-
-typedef std::vector<PrinterBasicInfo> PrinterList;
-
-struct PrinterCapsAndDefaults {
-  std::string printer_capabilities;
-  std::string caps_mime_type;
-  std::string printer_defaults;
-  std::string defaults_mime_type;
-};
-
 enum PrintJobStatus {
   PRINT_JOB_STATUS_INVALID,
   PRINT_JOB_STATUS_IN_PROGRESS,
@@ -75,7 +61,7 @@ struct PrintJobDetails {
 // obtain available printing system.
 // Please note, that PrintSystem is not platform specific, but rather
 // print system specific. For example, CUPS is available on both Linux and Mac,
-// but not avaialble on ChromeOS, etc. This design allows us to add more
+// but not available on ChromeOS, etc. This design allows us to add more
 // functionality on some platforms, while reusing core (CUPS) functions.
 class PrintSystem : public base::RefCountedThreadSafe<PrintSystem> {
  public:
@@ -113,7 +99,8 @@ class PrintSystem : public base::RefCountedThreadSafe<PrintSystem> {
     virtual ~PrinterWatcher();
     virtual bool StartWatching(PrinterWatcher::Delegate* delegate) = 0;
     virtual bool StopWatching() = 0;
-    virtual bool GetCurrentPrinterInfo(PrinterBasicInfo* printer_info) = 0;
+    virtual bool GetCurrentPrinterInfo(
+        printing::PrinterBasicInfo* printer_info) = 0;
   };
 
   class JobSpooler : public base::RefCountedThreadSafe<JobSpooler> {
@@ -141,12 +128,8 @@ class PrintSystem : public base::RefCountedThreadSafe<PrintSystem> {
 
   virtual ~PrintSystem();
 
-  // Enumerates the list of installed local and network printers.
-  virtual void EnumeratePrinters(PrinterList* printer_list) = 0;
-
-  // Gets the capabilities and defaults for a specific printer.
-  virtual bool GetPrinterCapsAndDefaults(const std::string& printer_name,
-                                     PrinterCapsAndDefaults* printer_info) = 0;
+  // Get the printing backend.
+  virtual printing::PrintBackend* GetPrintBackend() = 0;
 
   // Returns true if ticket is valid.
   virtual bool ValidatePrintTicket(const std::string& printer_name,
@@ -157,9 +140,6 @@ class PrintSystem : public base::RefCountedThreadSafe<PrintSystem> {
                              PlatformJobId job_id,
                              PrintJobDetails *job_details) = 0;
 
-  // Returns true if printer_name points to a valid printer.
-  virtual bool IsValidPrinter(const std::string& printer_name) = 0;
-
   // Factory methods to create corresponding watcher. Callee is responsible
   // for deleting objects. Return NULL if failed.
   virtual PrintServerWatcher* CreatePrintServerWatcher() = 0;
diff --git a/chrome/service/cloud_print/print_system_cups.cc b/chrome/service/cloud_print/print_system_cups.cc
index b8a7378..99e3d1d 100644
--- a/chrome/service/cloud_print/print_system_cups.cc
+++ b/chrome/service/cloud_print/print_system_cups.cc
@@ -14,7 +14,6 @@
 #include <map>
 
 #include "base/file_path.h"
-#include "base/file_util.h"
 #include "base/json/json_reader.h"
 #include "base/lock.h"
 #include "base/logging.h"
@@ -26,58 +25,8 @@
 #include "base/values.h"
 #include "base/utf_string_conversions.h"
 #include "googleurl/src/gurl.h"
-
-namespace {
-
-// Init GCrypt library (needed for CUPS) using pthreads.
-// I've hit a bug in CUPS library, when it crashed with: "ath.c:184:
-// _gcry_ath_mutex_lock: Assertion `*lock == ((ath_mutex_t) 0)' failed."
-// It happened whe multiple threads tried printing simultaneously.
-// Google search for 'gnutls thread safety' provided with following solution
-// where we initialize gcrypt by initializing gnutls.
-//
-// Initially, we linked with -lgnutls and simply called gnutls_global_init(),
-// but this did not work well since we build one binary on Ubuntu Hardy and
-// expect it to run on many Linux distros. (See http://crbug.com/46954)
-// So instead we use dlopen() and dlsym() to dynamically load and call
-// gnutls_global_init().
-
-GCRY_THREAD_OPTION_PTHREAD_IMPL;
-
-bool init_gnutls() {
-  const char* kGnuTlsFile = "libgnutls.so";
-  void* gnutls_lib = dlopen(kGnuTlsFile, RTLD_NOW);
-  if (!gnutls_lib) {
-    LOG(ERROR) << "Cannot load " << kGnuTlsFile;
-    return false;
-  }
-  const char* kGnuTlsInitFuncName = "gnutls_global_init";
-  int (*pgnutls_global_init)(void) = reinterpret_cast<int(*)()>(
-      dlsym(gnutls_lib, kGnuTlsInitFuncName));
-  if (!pgnutls_global_init) {
-    LOG(ERROR) << "Could not find " << kGnuTlsInitFuncName
-               << " in " << kGnuTlsFile;
-    return false;
-  }
-  return ((*pgnutls_global_init)() == 0);
-}
-
-void init_gcrypt() {
-  // The gnutls_global_init() man page warns it's not thread safe. Locking this
-  // entire function just to be on the safe side.
-  static Lock init_gcrypt_lock;
-  AutoLock init_gcrypt_autolock(init_gcrypt_lock);
-  static bool gcrypt_initialized = false;
-  if (!gcrypt_initialized) {
-    gcry_control(GCRYCTL_SET_THREAD_CBS, &gcry_threads_pthread);
-    gcrypt_initialized = init_gnutls();
-    if (!gcrypt_initialized) {
-      LOG(ERROR) << "Gcrypt initialization failed";
-    }
-  }
-}
-
-}  // namespace
+#include "printing/backend/cups_helper.h"
+#include "printing/backend/print_backend.h"
 
 namespace cloud_print {
 
@@ -88,49 +37,13 @@ static const char kCUPSPrintServerURL[] = "print_server_url";
 // Default port for IPP print servers.
 static const int kDefaultIPPServerPort = 631;
 
-// Helper wrapper around http_t structure, with connection and cleanup
-// functionality.
-class HttpConnectionCUPS {
- public:
-  explicit HttpConnectionCUPS(const GURL& print_server_url) : http_(NULL) {
-    // If we have an empty url, use default print server.
-    if (print_server_url.is_empty())
-      return;
-
-    int port = print_server_url.IntPort();
-    if (port == url_parse::PORT_UNSPECIFIED)
-      port = kDefaultIPPServerPort;
-
-    http_ = httpConnectEncrypt(print_server_url.host().c_str(), port,
-                               HTTP_ENCRYPT_NEVER);
-    if (http_ == NULL) {
-      LOG(ERROR) << "CP_CUPS: Failed connecting to print server: " <<
-                 print_server_url;
-    }
-  }
-
-  ~HttpConnectionCUPS() {
-    if (http_ != NULL)
-      httpClose(http_);
-  }
-
-  http_t* http() {
-    return http_;
-  }
-
- private:
-  http_t* http_;
-};
-
 class PrintSystemCUPS : public PrintSystem {
  public:
-  explicit PrintSystemCUPS(const GURL& print_server_url);
+  PrintSystemCUPS(const GURL& print_server_url,
+                  const DictionaryValue* print_system_settings);
 
   // PrintSystem implementation.
-  virtual void EnumeratePrinters(PrinterList* printer_list);
-
-  virtual bool GetPrinterCapsAndDefaults(const std::string& printer_name,
-                                         PrinterCapsAndDefaults* printer_info);
+  virtual printing::PrintBackend* GetPrintBackend();
 
   virtual bool ValidatePrintTicket(const std::string& printer_name,
                                    const std::string& print_ticket_data);
@@ -139,9 +52,6 @@ class PrintSystemCUPS : public PrintSystem {
                              PlatformJobId job_id,
                              PrintJobDetails *job_details);
 
-  virtual bool IsValidPrinter(const std::string& printer_name);
-
-
   // TODO(gene): Add implementation for CUPS print server watcher.
   class PrintServerWatcherCUPS
     : public PrintSystem::PrintServerWatcher {
@@ -185,7 +95,7 @@ class PrintSystemCUPS : public PrintSystem {
       delegate_ = NULL;
       return true;
     }
-    bool GetCurrentPrinterInfo(PrinterBasicInfo* printer_info) {
+    bool GetCurrentPrinterInfo(printing::PrinterBasicInfo* printer_info) {
       DCHECK(printer_info);
       return print_system_->GetPrinterInfo(printer_name_, printer_info);
     }
@@ -258,7 +168,8 @@ class PrintSystemCUPS : public PrintSystem {
                               const std::string& print_data_mime_type,
                               const std::string& printer_name,
                               const std::string& job_title);
-  bool GetPrinterInfo(const std::string& printer_name, PrinterBasicInfo* info);
+  bool GetPrinterInfo(const std::string& printer_name,
+                      printing::PrinterBasicInfo* info);
   bool ParsePrintTicket(const std::string& print_ticket,
                         std::map<std::string, std::string>* options);
 
@@ -267,84 +178,30 @@ class PrintSystemCUPS : public PrintSystem {
   // <functions>2()  are called when print server is specified, and plain
   // version in another case. There is an issue specifing CUPS_HTTP_DEFAULT
   // in the <functions>2(), it does not work in CUPS prior to 1.4.
-  int GetDests(cups_dest_t** dests);
-  FilePath GetPPD(const char* name);
   int GetJobs(cups_job_t** jobs, const char* name,
               int myjobs, int whichjobs);
   int PrintFile(const char* name, const char* filename, const char* title,
                 int num_options, cups_option_t* options);
 
+  void Init(const DictionaryValue* print_system_settings);
+
   GURL print_server_url_;
+  scoped_refptr<printing::PrintBackend> print_backend_;
 };
 
-PrintSystemCUPS::PrintSystemCUPS(const GURL& print_server_url)
+PrintSystemCUPS::PrintSystemCUPS(const GURL& print_server_url,
+                                 const DictionaryValue* print_system_settings)
     : print_server_url_(print_server_url) {
+  Init(print_system_settings);
 }
 
-void PrintSystemCUPS::EnumeratePrinters(PrinterList* printer_list) {
-  DCHECK(printer_list);
-  printer_list->clear();
-
-  cups_dest_t* destinations = NULL;
-  int num_dests = GetDests(&destinations);
-
-  for (int printer_index = 0; printer_index < num_dests; printer_index++) {
-    const cups_dest_t& printer = destinations[printer_index];
-
-    PrinterBasicInfo printer_info;
-    printer_info.printer_name = printer.name;
-
-    const char* info = cupsGetOption(kCUPSPrinterInfoOpt,
-        printer.num_options, printer.options);
-    if (info != NULL)
-      printer_info.printer_description = info;
-
-    const char* state = cupsGetOption(kCUPSPrinterStateOpt,
-        printer.num_options, printer.options);
-    if (state != NULL)
-      base::StringToInt(state, &printer_info.printer_status);
-
-    // Store printer options.
-    for (int opt_index = 0; opt_index < printer.num_options; opt_index++) {
-      printer_info.options[printer.options[opt_index].name] =
-          printer.options[opt_index].value;
-    }
-
-    printer_list->push_back(printer_info);
-  }
-
-  cupsFreeDests(num_dests, destinations);
-
-  LOG(INFO) << "CP_CUPS: Enumerated " << printer_list->size() << " printers.";
+void PrintSystemCUPS::Init(const DictionaryValue* print_system_settings) {
+  print_backend_ =
+      printing::PrintBackend::CreateInstance(print_system_settings);
 }
 
-bool PrintSystemCUPS::GetPrinterCapsAndDefaults(const std::string& printer_name,
-                                         PrinterCapsAndDefaults* printer_info) {
-  DCHECK(printer_info);
-
-  LOG(INFO) << "CP_CUPS: Getting Caps and Defaults for: " << printer_name;
-
-  FilePath ppd_path(GetPPD(printer_name.c_str()));
-  // In some cases CUPS failed to get ppd file.
-  if (ppd_path.empty()) {
-    LOG(ERROR) << "CP_CUPS: Failed to get PPD for: " << printer_name;
-    return false;
-  }
-
-  std::string content;
-  bool res = file_util::ReadFileToString(ppd_path, &content);
-
-  file_util::Delete(ppd_path, false);
-
-  if (res) {
-    printer_info->printer_capabilities.swap(content);
-    printer_info->caps_mime_type = "application/pagemaker";
-    // In CUPS, printer defaults is a part of PPD file. Nothing to upload here.
-    printer_info->printer_defaults.clear();
-    printer_info->defaults_mime_type.clear();
-  }
-
-  return res;
+printing::PrintBackend* PrintSystemCUPS::GetPrintBackend() {
+  return print_backend_;
 }
 
 bool PrintSystemCUPS::ValidatePrintTicket(const std::string& printer_name,
@@ -425,7 +282,7 @@ bool PrintSystemCUPS::GetJobDetails(const std::string& printer_name,
 }
 
 bool PrintSystemCUPS::GetPrinterInfo(const std::string& printer_name,
-                                     PrinterBasicInfo* info) {
+                                     printing::PrinterBasicInfo* info) {
   DCHECK(info);
 
   LOG(INFO) << "CP_CUPS: Getting printer info for: " << printer_name;
@@ -433,10 +290,10 @@ bool PrintSystemCUPS::GetPrinterInfo(const std::string& printer_name,
   // This is not very efficient way to get specific printer info. CUPS 1.4
   // supports cupsGetNamedDest() function. However, CUPS 1.4 is not available
   // everywhere (for example, it supported from Mac OS 10.6 only).
-  PrinterList printer_list;
-  EnumeratePrinters(&printer_list);
+  printing::PrinterList printer_list;
+  print_backend_->EnumeratePrinters(&printer_list);
 
-  PrinterList::iterator it;
+  printing::PrinterList::iterator it;
   for (it = printer_list.begin(); it != printer_list.end(); ++it) {
     if (it->printer_name == printer_name) {
       *info = *it;
@@ -446,11 +303,6 @@ bool PrintSystemCUPS::GetPrinterInfo(const std::string& printer_name,
   return false;
 }
 
-bool PrintSystemCUPS::IsValidPrinter(const std::string& printer_name) {
-  PrinterBasicInfo info;
-  return GetPrinterInfo(printer_name, &info);
-}
-
 PrintSystem::PrintServerWatcher*
 PrintSystemCUPS::CreatePrintServerWatcher() {
   return new PrintServerWatcherCUPS();
@@ -477,43 +329,13 @@ std::string PrintSystem::GenerateProxyId() {
 
 scoped_refptr<PrintSystem> PrintSystem::CreateInstance(
     const DictionaryValue* print_system_settings) {
-  // Initialize gcrypt library.
-  init_gcrypt();
-
   std::string print_server_url_str;
   if (print_system_settings) {
-    print_system_settings->GetString(
-        kCUPSPrintServerURL, &print_server_url_str);
+    print_system_settings->GetString(kCUPSPrintServerURL,
+                                     &print_server_url_str);
   }
   GURL print_server_url(print_server_url_str.c_str());
-  return new PrintSystemCUPS(print_server_url);
-}
-
-int PrintSystemCUPS::GetDests(cups_dest_t** dests) {
-  if (print_server_url_.is_empty()) {  // Use default (local) print server.
-    return cupsGetDests(dests);
-  } else {
-    HttpConnectionCUPS http(print_server_url_);
-    return cupsGetDests2(http.http(), dests);
-  }
-}
-
-FilePath PrintSystemCUPS::GetPPD(const char* name) {
-  // cupsGetPPD returns a filename stored in a static buffer in CUPS.
-  // Protect this code with lock.
-  static Lock ppd_lock;
-  AutoLock ppd_autolock(ppd_lock);
-  FilePath ppd_path;
-  const char* ppd_file_path = NULL;
-  if (print_server_url_.is_empty()) {  // Use default (local) print server.
-    ppd_file_path = cupsGetPPD(name);
-  } else {
-    HttpConnectionCUPS http(print_server_url_);
-    ppd_file_path = cupsGetPPD2(http.http(), name);
-  }
-  if (ppd_file_path)
-    ppd_path = FilePath(ppd_file_path);
-  return ppd_path;
+  return new PrintSystemCUPS(print_server_url, print_system_settings);
 }
 
 int PrintSystemCUPS::PrintFile(const char* name, const char* filename,
@@ -522,7 +344,7 @@ int PrintSystemCUPS::PrintFile(const char* name, const char* filename,
   if (print_server_url_.is_empty()) {  // Use default (local) print server.
     return cupsPrintFile(name, filename, title, num_options, options);
   } else {
-    HttpConnectionCUPS http(print_server_url_);
+    printing::HttpConnectionCUPS http(print_server_url_);
     return cupsPrintFile2(http.http(), name, filename,
                           title, num_options, options);
   }
@@ -533,7 +355,7 @@ int PrintSystemCUPS::GetJobs(cups_job_t** jobs, const char* name,
   if (print_server_url_.is_empty()) {  // Use default (local) print server.
     return cupsGetJobs(jobs, name, myjobs, whichjobs);
   } else {
-    HttpConnectionCUPS http(print_server_url_);
+    printing::HttpConnectionCUPS http(print_server_url_);
     return cupsGetJobs2(http.http(), jobs, name, myjobs, whichjobs);
   }
 }
diff --git a/chrome/service/cloud_print/print_system_win.cc b/chrome/service/cloud_print/print_system_win.cc
index fc3cc02..77272d6 100644
--- a/chrome/service/cloud_print/print_system_win.cc
+++ b/chrome/service/cloud_print/print_system_win.cc
@@ -4,15 +4,11 @@
 
 #include "chrome/service/cloud_print/print_system.h"
 
-#include <windows.h>
 #include <objidl.h>
-#include <ocidl.h>
-#include <olectl.h>
 #include <prntvpt.h>
 #include <winspool.h>
 
-#include "base/lock.h"
-#include "base/file_util.h"
+#include "base/file_path.h"
 #include "base/object_watcher.h"
 #include "base/scoped_ptr.h"
 #include "base/utf_string_conversions.h"
@@ -22,11 +18,13 @@
 #include "chrome/service/service_process.h"
 #include "chrome/service/service_utility_process_host.h"
 #include "gfx/rect.h"
+#include "printing/backend/print_backend.h"
+#include "printing/backend/print_backend_consts.h"
+#include "printing/backend/win_helper.h"
 #include "printing/native_metafile.h"
 #include "printing/page_range.h"
 
 #pragma comment(lib, "prntvpt.lib")
-#pragma comment(lib, "rpcrt4.lib")
 
 using base::win::ScopedBstr;
 using base::win::ScopedComPtr;
@@ -55,11 +53,6 @@ class DevMode {
   DISALLOW_COPY_AND_ASSIGN(DevMode);
 };
 
-bool InitXPSModule() {
-  HMODULE prntvpt_module = LoadLibrary(L"prntvpt.dll");
-  return (NULL != prntvpt_module);
-}
-
 inline HRESULT GetLastErrorHR() {
   LONG error = GetLastError();
   return HRESULT_FROM_WIN32(error);
@@ -81,19 +74,6 @@ HRESULT StreamFromPrintTicket(const std::string& print_ticket,
   return S_OK;
 }
 
-HRESULT StreamOnHGlobalToString(IStream* stream, std::string* out) {
-  DCHECK(stream);
-  DCHECK(out);
-  HGLOBAL hdata = NULL;
-  HRESULT hr = GetHGlobalFromStream(stream, &hdata);
-  if (SUCCEEDED(hr)) {
-    DCHECK(hdata);
-    ScopedHGlobal<char> locked_data(hdata);
-    out->assign(locked_data.release(), locked_data.Size());
-  }
-  return hr;
-}
-
 HRESULT PrintTicketToDevMode(const std::string& printer_name,
                              const std::string& print_ticket,
                              DevMode* dev_mode) {
@@ -209,7 +189,7 @@ class PrintSystemWatcherWin
     watcher_.StartWatching(printer_change_, this);
   }
 
-  bool GetCurrentPrinterInfo(PrinterBasicInfo* printer_info) {
+  bool GetCurrentPrinterInfo(printing::PrinterBasicInfo* printer_info) {
     DCHECK(printer_info);
     if (!printer_)
       return false;
@@ -256,10 +236,10 @@ typedef PrintSystemWatcherWin::Delegate PrintSystemWatcherWinDelegate;
 
 class PrintSystemWin : public PrintSystem {
  public:
-  virtual void EnumeratePrinters(PrinterList* printer_list);
+  PrintSystemWin();
 
-  virtual bool GetPrinterCapsAndDefaults(const std::string& printer_name,
-                                         PrinterCapsAndDefaults* printer_info);
+  // PrintSystem implementation.
+  virtual printing::PrintBackend* GetPrintBackend();
 
   virtual bool ValidatePrintTicket(const std::string& printer_name,
                                    const std::string& print_ticket_data);
@@ -268,8 +248,6 @@ class PrintSystemWin : public PrintSystem {
                              PlatformJobId job_id,
                              PrintJobDetails *job_details);
 
-  virtual bool IsValidPrinter(const std::string& printer_name);
-
   class PrintServerWatcherWin
     : public PrintSystem::PrintServerWatcher,
       public PrintSystemWatcherWinDelegate {
@@ -323,7 +301,8 @@ class PrintSystemWin : public PrintSystem {
       delegate_ = NULL;
       return ret;
     }
-    virtual bool GetCurrentPrinterInfo(PrinterBasicInfo* printer_info) {
+    virtual bool GetCurrentPrinterInfo(
+        printing::PrinterBasicInfo* printer_info) {
       return watcher_.GetCurrentPrinterInfo(printer_info);
     }
 
@@ -390,7 +369,7 @@ class PrintSystemWin : public PrintSystem {
           return false;
         }
 
-        if (!InitXPSModule()) {
+        if (!printing::InitXPSModule()) {
           // TODO(sanjeevr): Handle legacy proxy case (with no prntvpt.dll)
           return false;
         }
@@ -527,115 +506,29 @@ class PrintSystemWin : public PrintSystem {
   virtual PrintSystem::PrinterWatcher* CreatePrinterWatcher(
       const std::string& printer_name);
   virtual PrintSystem::JobSpooler* CreateJobSpooler();
+
+ private:
+  void Init();
+
+  scoped_refptr<printing::PrintBackend> print_backend_;
 };
 
-void PrintSystemWin::EnumeratePrinters(PrinterList* printer_list) {
-  DCHECK(printer_list);
-  DWORD bytes_needed = 0;
-  DWORD count_returned = 0;
-  BOOL ret = EnumPrinters(PRINTER_ENUM_LOCAL|PRINTER_ENUM_CONNECTIONS, NULL, 2,
-                          NULL, 0, &bytes_needed, &count_returned);
-  if (0 != bytes_needed) {
-    scoped_ptr<BYTE> printer_info_buffer(new BYTE[bytes_needed]);
-    ret = EnumPrinters(PRINTER_ENUM_LOCAL|PRINTER_ENUM_CONNECTIONS, NULL, 2,
-                       printer_info_buffer.get(), bytes_needed, &bytes_needed,
-                       &count_returned);
-    DCHECK(ret);
-    PRINTER_INFO_2* printer_info =
-        reinterpret_cast<PRINTER_INFO_2*>(printer_info_buffer.get());
-    for (DWORD index = 0; index < count_returned; index++) {
-      PrinterBasicInfo info;
-      info.printer_name = WideToUTF8(printer_info[index].pPrinterName);
-      if (printer_info[index].pComment)
-        info.printer_description = WideToUTF8(printer_info[index].pComment);
-      info.printer_status = printer_info[index].Status;
-      if (printer_info[index].pLocation)
-        info.options[kLocationTagName] =
-            WideToUTF8(printer_info[index].pLocation);
-      if (printer_info[index].pDriverName)
-        info.options[kDriverNameTagName] =
-            WideToUTF8(printer_info[index].pDriverName);
-      printer_list->push_back(info);
-    }
-  }
+PrintSystemWin::PrintSystemWin() {
+  Init();
 }
 
-bool PrintSystemWin::GetPrinterCapsAndDefaults(
-    const std::string& printer_name,
-    PrinterCapsAndDefaults* printer_info) {
-  if (!InitXPSModule()) {
-    // TODO(sanjeevr): Handle legacy proxy case (with no prntvpt.dll)
-    return false;
-  }
-  if (!IsValidPrinter(printer_name)) {
-    return false;
-  }
-  DCHECK(printer_info);
-  HPTPROVIDER provider = NULL;
-  std::wstring printer_name_wide = UTF8ToWide(printer_name);
-  HRESULT hr = PTOpenProvider(printer_name_wide.c_str(), 1, &provider);
-  DCHECK(SUCCEEDED(hr));
-  if (provider) {
-    ScopedComPtr<IStream> print_capabilities_stream;
-    hr = CreateStreamOnHGlobal(NULL, TRUE,
-                               print_capabilities_stream.Receive());
-    DCHECK(SUCCEEDED(hr));
-    if (print_capabilities_stream) {
-      ScopedBstr error;
-      hr = PTGetPrintCapabilities(provider, NULL, print_capabilities_stream,
-                                  error.Receive());
-      DCHECK(SUCCEEDED(hr));
-      if (FAILED(hr)) {
-        return false;
-      }
-      hr = StreamOnHGlobalToString(print_capabilities_stream.get(),
-                                   &printer_info->printer_capabilities);
-      DCHECK(SUCCEEDED(hr));
-      printer_info->caps_mime_type = "text/xml";
-    }
-    // TODO(sanjeevr): Add ScopedPrinterHandle
-    HANDLE printer_handle = NULL;
-    OpenPrinter(const_cast<LPTSTR>(printer_name_wide.c_str()), &printer_handle,
-                NULL);
-    DCHECK(printer_handle);
-    if (printer_handle) {
-      DWORD devmode_size = DocumentProperties(
-          NULL, printer_handle, const_cast<LPTSTR>(printer_name_wide.c_str()),
-          NULL, NULL, 0);
-      DCHECK(0 != devmode_size);
-      scoped_ptr<BYTE> devmode_out_buffer(new BYTE[devmode_size]);
-      DEVMODE* devmode_out =
-          reinterpret_cast<DEVMODE*>(devmode_out_buffer.get());
-      DocumentProperties(
-          NULL, printer_handle, const_cast<LPTSTR>(printer_name_wide.c_str()),
-          devmode_out, NULL, DM_OUT_BUFFER);
-      ScopedComPtr<IStream> printer_defaults_stream;
-      hr = CreateStreamOnHGlobal(NULL, TRUE,
-                                 printer_defaults_stream.Receive());
-      DCHECK(SUCCEEDED(hr));
-      if (printer_defaults_stream) {
-        hr = PTConvertDevModeToPrintTicket(provider, devmode_size,
-                                           devmode_out, kPTJobScope,
-                                           printer_defaults_stream);
-        DCHECK(SUCCEEDED(hr));
-        if (SUCCEEDED(hr)) {
-          hr = StreamOnHGlobalToString(printer_defaults_stream.get(),
-                                       &printer_info->printer_defaults);
-          DCHECK(SUCCEEDED(hr));
-          printer_info->defaults_mime_type = "text/xml";
-        }
-      }
-      ClosePrinter(printer_handle);
-    }
-    PTCloseProvider(provider);
-  }
-  return true;
+void PrintSystemWin::Init() {
+  print_backend_ = printing::PrintBackend::CreateInstance(NULL);
+}
+
+printing::PrintBackend* PrintSystemWin::GetPrintBackend() {
+  return print_backend_;
 }
 
 bool PrintSystemWin::ValidatePrintTicket(
     const std::string& printer_name,
     const std::string& print_ticket_data) {
-  if (!InitXPSModule()) {
+  if (!printing::InitXPSModule()) {
     // TODO(sanjeevr): Handle legacy proxy case (with no prntvpt.dll)
     return false;
   }
@@ -712,19 +605,6 @@ bool PrintSystemWin::GetJobDetails(const std::string& printer_name,
   return ret;
 }
 
-bool PrintSystemWin::IsValidPrinter(const std::string& printer_name) {
-  std::wstring printer_name_wide = UTF8ToWide(printer_name);
-  HANDLE printer_handle = NULL;
-  OpenPrinter(const_cast<LPTSTR>(printer_name_wide.c_str()), &printer_handle,
-              NULL);
-  bool ret = false;
-  if (printer_handle) {
-    ret = true;
-    ClosePrinter(printer_handle);
-  }
-  return ret;
-}
-
 PrintSystem::PrintServerWatcher*
 PrintSystemWin::CreatePrintServerWatcher() {
   return new PrintServerWatcherWin();
@@ -760,4 +640,3 @@ scoped_refptr<PrintSystem> PrintSystem::CreateInstance(
 }
 
 }  // namespace cloud_print
-
diff --git a/chrome/service/cloud_print/printer_job_handler.cc b/chrome/service/cloud_print/printer_job_handler.cc
index bdc5801..9d4f46f 100644
--- a/chrome/service/cloud_print/printer_job_handler.cc
+++ b/chrome/service/cloud_print/printer_job_handler.cc
@@ -18,7 +18,7 @@
 #include "net/http/http_response_headers.h"
 
 PrinterJobHandler::PrinterJobHandler(
-    const cloud_print::PrinterBasicInfo& printer_info,
+    const printing::PrinterBasicInfo& printer_info,
     const PrinterInfoFromCloud& printer_info_cloud,
     const std::string& auth_token,
     const GURL& cloud_print_server_url,
@@ -45,7 +45,8 @@ PrinterJobHandler::PrinterJobHandler(
 }
 
 bool PrinterJobHandler::Initialize() {
-  if (print_system_->IsValidPrinter(printer_info_.printer_name)) {
+  if (print_system_->GetPrintBackend()->IsValidPrinter(
+      printer_info_.printer_name)) {
     printer_watcher_ = print_system_->CreatePrinterWatcher(
         printer_info_.printer_name);
     printer_watcher_->StartWatching(this);
@@ -136,14 +137,14 @@ bool PrinterJobHandler::UpdatePrinterInfo() {
           << printer_info_cloud_.printer_id;
   // We need to update the parts of the printer info that have changed
   // (could be printer name, description, status or capabilities).
-  cloud_print::PrinterBasicInfo printer_info;
+  printing::PrinterBasicInfo printer_info;
   printer_watcher_->GetCurrentPrinterInfo(&printer_info);
-  cloud_print::PrinterCapsAndDefaults printer_caps;
+  printing::PrinterCapsAndDefaults printer_caps;
   std::string post_data;
   std::string mime_boundary;
   CloudPrintHelpers::CreateMimeBoundaryForUpload(&mime_boundary);
-  if (print_system_->GetPrinterCapsAndDefaults(printer_info.printer_name,
-                                               &printer_caps)) {
+  if (print_system_->GetPrintBackend()->GetPrinterCapsAndDefaults(
+      printer_info.printer_name, &printer_caps)) {
     std::string caps_hash = MD5String(printer_caps.printer_capabilities);
     if (caps_hash != printer_info_cloud_.caps_hash) {
       // Hashes don't match, we need to upload new capabilities (the defaults
@@ -679,4 +680,3 @@ void PrinterJobHandler::OnJobSpoolFailed() {
                                                 &PrinterJobHandler::JobFailed,
                                                 PRINT_FAILED));
 }
-
diff --git a/chrome/service/cloud_print/printer_job_handler.h b/chrome/service/cloud_print/printer_job_handler.h
index 2831fb90..02c7be3 100644
--- a/chrome/service/cloud_print/printer_job_handler.h
+++ b/chrome/service/cloud_print/printer_job_handler.h
@@ -14,10 +14,10 @@
 #include "base/message_loop_proxy.h"
 #include "base/thread.h"
 #include "chrome/service/cloud_print/job_status_updater.h"
-#include "chrome/service/cloud_print/print_system.h"
 #include "chrome/common/net/url_fetcher.h"
 #include "googleurl/src/gurl.h"
 #include "net/url_request/url_request_status.h"
+#include "printing/backend/print_backend.h"
 
 // A class that handles cloud print jobs for a particular printer. This class
 // imlements a state machine that transitions from Start to various states. The
@@ -104,7 +104,7 @@ class PrinterJobHandler : public base::RefCountedThreadSafe<PrinterJobHandler>,
   };
 
   // Begin public interface
-  PrinterJobHandler(const cloud_print::PrinterBasicInfo& printer_info,
+  PrinterJobHandler(const printing::PrinterBasicInfo& printer_info,
                     const PrinterInfoFromCloud& printer_info_from_server,
                     const std::string& auth_token,
                     const GURL& cloud_print_server_url,
@@ -232,7 +232,7 @@ class PrinterJobHandler : public base::RefCountedThreadSafe<PrinterJobHandler>,
 
   scoped_ptr<URLFetcher> request_;
   scoped_refptr<cloud_print::PrintSystem> print_system_;
-  cloud_print::PrinterBasicInfo printer_info_;
+  printing::PrinterBasicInfo printer_info_;
   PrinterInfoFromCloud printer_info_cloud_;
   std::string auth_token_;
   GURL cloud_print_server_url_;
@@ -280,4 +280,3 @@ class PrinterJobHandler : public base::RefCountedThreadSafe<PrinterJobHandler>,
 typedef PrinterJobHandler::Delegate PrinterJobHandlerDelegate;
 
 #endif  // CHROME_SERVICE_CLOUD_PRINT_PRINTER_JOB_HANDLER_H_
-
diff --git a/printing/backend/cups_helper.cc b/printing/backend/cups_helper.cc
new file mode 100644
index 0000000..2c3b853
--- /dev/null
+++ b/printing/backend/cups_helper.cc
@@ -0,0 +1,44 @@
+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "printing/backend/cups_helper.h"
+
+#include "base/logging.h"
+#include "googleurl/src/gurl.h"
+
+namespace printing {
+
+// Default port for IPP print servers.
+static const int kDefaultIPPServerPort = 631;
+
+// Helper wrapper around http_t structure, with connection and cleanup
+// functionality.
+HttpConnectionCUPS::HttpConnectionCUPS(const GURL& print_server_url)
+    : http_(NULL) {
+  // If we have an empty url, use default print server.
+  if (print_server_url.is_empty())
+    return;
+
+  int port = print_server_url.IntPort();
+  if (port == url_parse::PORT_UNSPECIFIED)
+    port = kDefaultIPPServerPort;
+
+  http_ = httpConnectEncrypt(print_server_url.host().c_str(), port,
+                             HTTP_ENCRYPT_NEVER);
+  if (http_ == NULL) {
+    LOG(ERROR) << "CP_CUPS: Failed connecting to print server: " <<
+               print_server_url;
+  }
+}
+
+HttpConnectionCUPS::~HttpConnectionCUPS() {
+  if (http_ != NULL)
+    httpClose(http_);
+}
+
+http_t* HttpConnectionCUPS::http() {
+  return http_;
+}
+
+}  // namespace printing
diff --git a/printing/backend/cups_helper.h b/printing/backend/cups_helper.h
new file mode 100644
index 0000000..16841bc
--- /dev/null
+++ b/printing/backend/cups_helper.h
@@ -0,0 +1,31 @@
+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef PRINTING_BACKEND_CUPS_HELPER_H_
+#define PRINTING_BACKEND_CUPS_HELPER_H_
+#pragma once
+
+#include <cups/cups.h>
+
+class GURL;
+
+// These are helper functions for dealing with CUPS.
+namespace printing {
+
+// Helper wrapper around http_t structure, with connection and cleanup
+// functionality.
+class HttpConnectionCUPS {
+ public:
+  explicit HttpConnectionCUPS(const GURL& print_server_url);
+  ~HttpConnectionCUPS();
+
+  http_t* http();
+
+ private:
+  http_t* http_;
+};
+
+}  // namespace printing
+
+#endif  // PRINTING_BACKEND_CUPS_HELPER_H_
diff --git a/printing/backend/print_backend.cc b/printing/backend/print_backend.cc
new file mode 100644
index 0000000..307897d
--- /dev/null
+++ b/printing/backend/print_backend.cc
@@ -0,0 +1,15 @@
+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "printing/backend/print_backend.h"
+
+namespace printing {
+
+PrinterBasicInfo::PrinterBasicInfo() : printer_status(0) {}
+
+PrinterBasicInfo::~PrinterBasicInfo() {}
+
+PrintBackend::~PrintBackend() {}
+
+}  // namespace printing
diff --git a/printing/backend/print_backend.h b/printing/backend/print_backend.h
new file mode 100644
index 0000000..3b55268
--- /dev/null
+++ b/printing/backend/print_backend.h
@@ -0,0 +1,70 @@
+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef PRINTING_BACKEND_PRINT_BACKEND_H_
+#define PRINTING_BACKEND_PRINT_BACKEND_H_
+#pragma once
+
+#include <map>
+#include <string>
+#include <vector>
+
+#include "base/ref_counted.h"
+
+class DictionaryValue;
+
+// This is the interface for platform-specific code for a print backend
+namespace printing {
+
+struct PrinterBasicInfo {
+  PrinterBasicInfo();
+  ~PrinterBasicInfo();
+
+  std::string printer_name;
+  std::string printer_description;
+  int printer_status;
+  std::map<std::string, std::string> options;
+};
+
+typedef std::vector<PrinterBasicInfo> PrinterList;
+
+struct PrinterCapsAndDefaults {
+  std::string printer_capabilities;
+  std::string caps_mime_type;
+  std::string printer_defaults;
+  std::string defaults_mime_type;
+};
+
+// PrintBackend class will provide interface for different print backends
+// (Windows, CUPS) to implement. User will call CreateInstance() to
+// obtain available print backend.
+// Please note, that PrintBackend is not platform specific, but rather
+// print system specific. For example, CUPS is available on both Linux and Mac,
+// but not available on ChromeOS, etc. This design allows us to add more
+// functionality on some platforms, while reusing core (CUPS) functions.
+class PrintBackend : public base::RefCountedThreadSafe<PrintBackend> {
+ public:
+  virtual ~PrintBackend();
+
+  // Enumerates the list of installed local and network printers.
+  virtual void EnumeratePrinters(PrinterList* printer_list) = 0;
+
+  // Gets the capabilities and defaults for a specific printer.
+  virtual bool GetPrinterCapsAndDefaults(
+      const std::string& printer_name,
+      PrinterCapsAndDefaults* printer_info) = 0;
+
+  // Returns true if printer_name points to a valid printer.
+  virtual bool IsValidPrinter(const std::string& printer_name) = 0;
+
+  // Allocate a print backend. If |print_backend_settings| is NULL, default
+  // settings will be used.
+  // Return NULL if no print backend available.
+  static scoped_refptr<PrintBackend> CreateInstance(
+      const DictionaryValue* print_backend_settings);
+};
+
+}  // namespace printing
+
+#endif  // PRINTING_BACKEND_PRINT_BACKEND_H_
diff --git a/printing/backend/print_backend_consts.cc b/printing/backend/print_backend_consts.cc
new file mode 100644
index 0000000..77a0020
--- /dev/null
+++ b/printing/backend/print_backend_consts.cc
@@ -0,0 +1,10 @@
+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Constant defines used in the print backend code
+
+#include "printing/backend/print_backend_consts.h"
+
+const char kLocationTagName[] = "location";
+const char kDriverNameTagName[] = "drivername";
diff --git a/printing/backend/print_backend_consts.h b/printing/backend/print_backend_consts.h
new file mode 100644
index 0000000..003a87d
--- /dev/null
+++ b/printing/backend/print_backend_consts.h
@@ -0,0 +1,12 @@
+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef PRINTING_BACKEND_PRINT_BACKEND_CONSTS_H_
+#define PRINTING_BACKEND_PRINT_BACKEND_CONSTS_H_
+#pragma once
+
+extern const char kLocationTagName[];
+extern const char kDriverNameTagName[];
+
+#endif  // PRINTING_BACKEND_PRINT_BACKEND_CONSTS_H_
diff --git a/printing/backend/print_backend_cups.cc b/printing/backend/print_backend_cups.cc
new file mode 100644
index 0000000..9693299
--- /dev/null
+++ b/printing/backend/print_backend_cups.cc
@@ -0,0 +1,224 @@
+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "printing/backend/print_backend.h"
+
+#include <dlfcn.h>
+#include <errno.h>
+#include <gcrypt.h>
+#include <pthread.h>
+
+#include "base/file_util.h"
+#include "base/lock.h"
+#include "base/logging.h"
+#include "base/singleton.h"
+#include "base/string_number_conversions.h"
+#include "base/values.h"
+#include "googleurl/src/gurl.h"
+#include "printing/backend/cups_helper.h"
+
+GCRY_THREAD_OPTION_PTHREAD_IMPL;
+
+namespace {
+
+// Init GCrypt library (needed for CUPS) using pthreads.
+// There exists a bug in CUPS library, where it crashed with: "ath.c:184:
+// _gcry_ath_mutex_lock: Assertion `*lock == ((ath_mutex_t) 0)' failed."
+// It happened when multiple threads tried printing simultaneously.
+// Google search for 'gnutls thread safety' provided a solution that
+// initialized gcrypt and gnutls.
+
+// Initially, we linked with -lgnutls and simply called gnutls_global_init(),
+// but this did not work well since we build one binary on Ubuntu Hardy and
+// expect it to run on many Linux distros. (See http://crbug.com/46954)
+// So instead we use dlopen() and dlsym() to dynamically load and call
+// gnutls_global_init().
+
+class GcryptInitializer {
+ public:
+  GcryptInitializer() {
+    Init();
+  }
+
+ private:
+  void Init() {
+    gcry_control(GCRYCTL_SET_THREAD_CBS, &gcry_threads_pthread);
+    const char* kGnuTlsFile = "libgnutls.so";
+    void* gnutls_lib = dlopen(kGnuTlsFile, RTLD_NOW);
+    if (!gnutls_lib) {
+      LOG(ERROR) << "Cannot load " << kGnuTlsFile;
+      return;
+    }
+    const char* kGnuTlsInitFuncName = "gnutls_global_init";
+    int (*pgnutls_global_init)(void) = reinterpret_cast<int(*)()>(
+        dlsym(gnutls_lib, kGnuTlsInitFuncName));
+    if (!pgnutls_global_init) {
+      LOG(ERROR) << "Could not find " << kGnuTlsInitFuncName
+                 << " in " << kGnuTlsFile;
+      return;
+    }
+    if ((*pgnutls_global_init)() != 0)
+      LOG(ERROR) << "Gnutls initialization failed";
+  }
+};
+
+}  // namespace
+
+namespace printing {
+
+static const char kCUPSPrinterInfoOpt[] = "printer-info";
+static const char kCUPSPrinterStateOpt[] = "printer-state";
+static const char kCUPSPrintServerURL[] = "print_server_url";
+
+class PrintBackendCUPS : public PrintBackend {
+ public:
+  explicit PrintBackendCUPS(const GURL& print_server_url);
+  virtual ~PrintBackendCUPS() {}
+
+  // PrintBackend implementation.
+  virtual void EnumeratePrinters(PrinterList* printer_list);
+
+  virtual bool GetPrinterCapsAndDefaults(const std::string& printer_name,
+                                         PrinterCapsAndDefaults* printer_info);
+
+  virtual bool IsValidPrinter(const std::string& printer_name);
+
+ private:
+  // Following functions are wrappers around corresponding CUPS functions.
+  // <functions>2()  are called when print server is specified, and plain
+  // version in another case. There is an issue specifing CUPS_HTTP_DEFAULT
+  // in the <functions>2(), it does not work in CUPS prior to 1.4.
+  int GetDests(cups_dest_t** dests);
+  FilePath GetPPD(const char* name);
+
+  GURL print_server_url_;
+};
+
+PrintBackendCUPS::PrintBackendCUPS(const GURL& print_server_url)
+    : print_server_url_(print_server_url) {
+}
+
+void PrintBackendCUPS::EnumeratePrinters(PrinterList* printer_list) {
+  DCHECK(printer_list);
+  printer_list->clear();
+
+  cups_dest_t* destinations = NULL;
+  int num_dests = GetDests(&destinations);
+
+  for (int printer_index = 0; printer_index < num_dests; printer_index++) {
+    const cups_dest_t& printer = destinations[printer_index];
+
+    PrinterBasicInfo printer_info;
+    printer_info.printer_name = printer.name;
+
+    const char* info = cupsGetOption(kCUPSPrinterInfoOpt,
+        printer.num_options, printer.options);
+    if (info != NULL)
+      printer_info.printer_description = info;
+
+    const char* state = cupsGetOption(kCUPSPrinterStateOpt,
+        printer.num_options, printer.options);
+    if (state != NULL)
+      base::StringToInt(state, &printer_info.printer_status);
+
+    // Store printer options.
+    for (int opt_index = 0; opt_index < printer.num_options; opt_index++) {
+      printer_info.options[printer.options[opt_index].name] =
+          printer.options[opt_index].value;
+    }
+
+    printer_list->push_back(printer_info);
+  }
+
+  cupsFreeDests(num_dests, destinations);
+
+  LOG(INFO) << "CUPS: Enumerated " << printer_list->size() << " printers.";
+}
+
+bool PrintBackendCUPS::GetPrinterCapsAndDefaults(
+    const std::string& printer_name,
+    PrinterCapsAndDefaults* printer_info) {
+  DCHECK(printer_info);
+
+  LOG(INFO) << "CUPS: Getting Caps and Defaults for: " << printer_name;
+
+  FilePath ppd_path(GetPPD(printer_name.c_str()));
+  // In some cases CUPS failed to get ppd file.
+  if (ppd_path.empty()) {
+    LOG(ERROR) << "CUPS: Failed to get PPD for: " << printer_name;
+    return false;
+  }
+
+  std::string content;
+  bool res = file_util::ReadFileToString(ppd_path, &content);
+
+  file_util::Delete(ppd_path, false);
+
+  if (res) {
+    printer_info->printer_capabilities.swap(content);
+    printer_info->caps_mime_type = "application/pagemaker";
+    // In CUPS, printer defaults is a part of PPD file. Nothing to upload here.
+    printer_info->printer_defaults.clear();
+    printer_info->defaults_mime_type.clear();
+  }
+
+  return res;
+}
+
+bool PrintBackendCUPS::IsValidPrinter(const std::string& printer_name) {
+  // This is not very efficient way to get specific printer info. CUPS 1.4
+  // supports cupsGetNamedDest() function. However, CUPS 1.4 is not available
+  // everywhere (for example, it supported from Mac OS 10.6 only).
+  PrinterList printer_list;
+  EnumeratePrinters(&printer_list);
+
+  PrinterList::iterator it;
+  for (it = printer_list.begin(); it != printer_list.end(); ++it)
+    if (it->printer_name == printer_name)
+      return true;
+  return false;
+}
+
+scoped_refptr<PrintBackend> PrintBackend::CreateInstance(
+    const DictionaryValue* print_backend_settings) {
+  // Initialize gcrypt library.
+  Singleton<GcryptInitializer>::get();
+
+  std::string print_server_url_str;
+  if (print_backend_settings) {
+    print_backend_settings->GetString(kCUPSPrintServerURL,
+                                      &print_server_url_str);
+  }
+  GURL print_server_url(print_server_url_str.c_str());
+  return new PrintBackendCUPS(print_server_url);
+}
+
+int PrintBackendCUPS::GetDests(cups_dest_t** dests) {
+  if (print_server_url_.is_empty()) {  // Use default (local) print server.
+    return cupsGetDests(dests);
+  } else {
+    HttpConnectionCUPS http(print_server_url_);
+    return cupsGetDests2(http.http(), dests);
+  }
+}
+
+FilePath PrintBackendCUPS::GetPPD(const char* name) {
+  // cupsGetPPD returns a filename stored in a static buffer in CUPS.
+  // Protect this code with lock.
+  static Lock ppd_lock;
+  AutoLock ppd_autolock(ppd_lock);
+  FilePath ppd_path;
+  const char* ppd_file_path = NULL;
+  if (print_server_url_.is_empty()) {  // Use default (local) print server.
+    ppd_file_path = cupsGetPPD(name);
+  } else {
+    HttpConnectionCUPS http(print_server_url_);
+    ppd_file_path = cupsGetPPD2(http.http(), name);
+  }
+  if (ppd_file_path)
+    ppd_path = FilePath(ppd_file_path);
+  return ppd_path;
+}
+
+}  // namespace printing
diff --git a/printing/backend/print_backend_dummy.cc b/printing/backend/print_backend_dummy.cc
new file mode 100644
index 0000000..008f00b
--- /dev/null
+++ b/printing/backend/print_backend_dummy.cc
@@ -0,0 +1,23 @@
+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// This is dummy implementation for all configurations where there is no
+// print backend.
+#if !defined(PRINT_BACKEND_AVAILABLE)
+
+#include "printing/backend/print_backend.h"
+
+#include "base/logging.h"
+
+namespace printing {
+
+scoped_refptr<PrintBackend> PrintBackend::CreateInstance(
+    const DictionaryValue* print_backend_settings) {
+  NOTREACHED();
+  return NULL;
+}
+
+}  // namespace printing
+
+#endif  // PRINT_BACKEND_AVAILABLE
diff --git a/printing/backend/print_backend_win.cc b/printing/backend/print_backend_win.cc
new file mode 100644
index 0000000..4cfd400
--- /dev/null
+++ b/printing/backend/print_backend_win.cc
@@ -0,0 +1,179 @@
+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "printing/backend/print_backend.h"
+
+#include <objidl.h>
+#include <prntvpt.h>
+#include <winspool.h>
+
+#include "base/scoped_ptr.h"
+#include "base/string_piece.h"
+#include "base/utf_string_conversions.h"
+#include "base/win/scoped_bstr.h"
+#include "base/win/scoped_comptr.h"
+#include "base/win/scoped_hglobal.h"
+#include "printing/backend/print_backend_consts.h"
+#include "printing/backend/win_helper.h"
+
+#pragma comment(lib, "prntvpt.lib")
+
+using base::win::ScopedBstr;
+using base::win::ScopedComPtr;
+using base::win::ScopedHGlobal;
+
+namespace {
+
+HRESULT StreamOnHGlobalToString(IStream* stream, std::string* out) {
+  DCHECK(stream);
+  DCHECK(out);
+  HGLOBAL hdata = NULL;
+  HRESULT hr = GetHGlobalFromStream(stream, &hdata);
+  if (SUCCEEDED(hr)) {
+    DCHECK(hdata);
+    ScopedHGlobal<char> locked_data(hdata);
+    out->assign(locked_data.release(), locked_data.Size());
+  }
+  return hr;
+}
+
+}  // namespace
+
+namespace printing {
+
+class PrintBackendWin : public PrintBackend {
+ public:
+  PrintBackendWin() {}
+  virtual ~PrintBackendWin() {}
+
+  virtual void EnumeratePrinters(PrinterList* printer_list);
+
+  virtual bool GetPrinterCapsAndDefaults(const std::string& printer_name,
+                                         PrinterCapsAndDefaults* printer_info);
+
+  virtual bool IsValidPrinter(const std::string& printer_name);
+};
+
+void PrintBackendWin::EnumeratePrinters(PrinterList* printer_list) {
+  DCHECK(printer_list);
+  DWORD bytes_needed = 0;
+  DWORD count_returned = 0;
+  BOOL ret = EnumPrinters(PRINTER_ENUM_LOCAL|PRINTER_ENUM_CONNECTIONS, NULL, 2,
+                          NULL, 0, &bytes_needed, &count_returned);
+  if (0 != bytes_needed) {
+    scoped_ptr<BYTE> printer_info_buffer(new BYTE[bytes_needed]);
+    ret = EnumPrinters(PRINTER_ENUM_LOCAL|PRINTER_ENUM_CONNECTIONS, NULL, 2,
+                       printer_info_buffer.get(), bytes_needed, &bytes_needed,
+                       &count_returned);
+    DCHECK(ret);
+    PRINTER_INFO_2* printer_info =
+        reinterpret_cast<PRINTER_INFO_2*>(printer_info_buffer.get());
+    for (DWORD index = 0; index < count_returned; index++) {
+      PrinterBasicInfo info;
+      info.printer_name = WideToUTF8(printer_info[index].pPrinterName);
+      if (printer_info[index].pComment)
+        info.printer_description = WideToUTF8(printer_info[index].pComment);
+      info.printer_status = printer_info[index].Status;
+      if (printer_info[index].pLocation)
+        info.options[kLocationTagName] =
+            WideToUTF8(printer_info[index].pLocation);
+      if (printer_info[index].pDriverName)
+        info.options[kDriverNameTagName] =
+            WideToUTF8(printer_info[index].pDriverName);
+      printer_list->push_back(info);
+    }
+  }
+}
+
+bool PrintBackendWin::GetPrinterCapsAndDefaults(
+    const std::string& printer_name,
+    PrinterCapsAndDefaults* printer_info) {
+  if (!printing::InitXPSModule()) {
+    // TODO(sanjeevr): Handle legacy proxy case (with no prntvpt.dll)
+    return false;
+  }
+  if (!IsValidPrinter(printer_name)) {
+    return false;
+  }
+  DCHECK(printer_info);
+  HPTPROVIDER provider = NULL;
+  std::wstring printer_name_wide = UTF8ToWide(printer_name);
+  HRESULT hr = PTOpenProvider(printer_name_wide.c_str(), 1, &provider);
+  DCHECK(SUCCEEDED(hr));
+  if (provider) {
+    ScopedComPtr<IStream> print_capabilities_stream;
+    hr = CreateStreamOnHGlobal(NULL, TRUE,
+                               print_capabilities_stream.Receive());
+    DCHECK(SUCCEEDED(hr));
+    if (print_capabilities_stream) {
+      ScopedBstr error;
+      hr = PTGetPrintCapabilities(provider, NULL, print_capabilities_stream,
+                                  error.Receive());
+      DCHECK(SUCCEEDED(hr));
+      if (FAILED(hr)) {
+        return false;
+      }
+      hr = StreamOnHGlobalToString(print_capabilities_stream.get(),
+                                   &printer_info->printer_capabilities);
+      DCHECK(SUCCEEDED(hr));
+      printer_info->caps_mime_type = "text/xml";
+    }
+    // TODO(sanjeevr): Add ScopedPrinterHandle
+    HANDLE printer_handle = NULL;
+    OpenPrinter(const_cast<LPTSTR>(printer_name_wide.c_str()), &printer_handle,
+                NULL);
+    DCHECK(printer_handle);
+    if (printer_handle) {
+      DWORD devmode_size = DocumentProperties(
+          NULL, printer_handle, const_cast<LPTSTR>(printer_name_wide.c_str()),
+          NULL, NULL, 0);
+      DCHECK_NE(0U, devmode_size);
+      scoped_ptr<BYTE> devmode_out_buffer(new BYTE[devmode_size]);
+      DEVMODE* devmode_out =
+          reinterpret_cast<DEVMODE*>(devmode_out_buffer.get());
+      DocumentProperties(
+          NULL, printer_handle, const_cast<LPTSTR>(printer_name_wide.c_str()),
+          devmode_out, NULL, DM_OUT_BUFFER);
+      ScopedComPtr<IStream> printer_defaults_stream;
+      hr = CreateStreamOnHGlobal(NULL, TRUE,
+                                 printer_defaults_stream.Receive());
+      DCHECK(SUCCEEDED(hr));
+      if (printer_defaults_stream) {
+        hr = PTConvertDevModeToPrintTicket(provider, devmode_size,
+                                           devmode_out, kPTJobScope,
+                                           printer_defaults_stream);
+        DCHECK(SUCCEEDED(hr));
+        if (SUCCEEDED(hr)) {
+          hr = StreamOnHGlobalToString(printer_defaults_stream.get(),
+                                       &printer_info->printer_defaults);
+          DCHECK(SUCCEEDED(hr));
+          printer_info->defaults_mime_type = "text/xml";
+        }
+      }
+      ClosePrinter(printer_handle);
+    }
+    PTCloseProvider(provider);
+  }
+  return true;
+}
+
+bool PrintBackendWin::IsValidPrinter(const std::string& printer_name) {
+  std::wstring printer_name_wide = UTF8ToWide(printer_name);
+  HANDLE printer_handle = NULL;
+  OpenPrinter(const_cast<LPTSTR>(printer_name_wide.c_str()), &printer_handle,
+              NULL);
+  bool ret = false;
+  if (printer_handle) {
+    ret = true;
+    ClosePrinter(printer_handle);
+  }
+  return ret;
+}
+
+scoped_refptr<PrintBackend> PrintBackend::CreateInstance(
+    const DictionaryValue* print_backend_settings) {
+  return new PrintBackendWin;
+}
+
+}  // namespace printing
diff --git a/printing/backend/win_helper.cc b/printing/backend/win_helper.cc
new file mode 100644
index 0000000..a5f515f
--- /dev/null
+++ b/printing/backend/win_helper.cc
@@ -0,0 +1,17 @@
+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "printing/backend/win_helper.h"
+
+
+#include <windows.h>
+
+namespace printing {
+
+bool InitXPSModule() {
+  HMODULE prntvpt_module = LoadLibrary(L"prntvpt.dll");
+  return (NULL != prntvpt_module);
+}
+
+}  // namespace printing
diff --git a/printing/backend/win_helper.h b/printing/backend/win_helper.h
new file mode 100644
index 0000000..a779ad7
--- /dev/null
+++ b/printing/backend/win_helper.h
@@ -0,0 +1,16 @@
+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef PRINTING_BACKEND_WIN_HELPER_H_
+#define PRINTING_BACKEND_WIN_HELPER_H_
+#pragma once
+
+// These are helper functions for dealing with Windows Printing.
+namespace printing {
+
+bool InitXPSModule();
+
+}  // namespace printing
+
+#endif  // PRINTING_BACKEND_WIN_HELPER_H_
diff --git a/printing/printing.gyp b/printing/printing.gyp
index 2970a90..a9f36e5 100644
--- a/printing/printing.gyp
+++ b/printing/printing.gyp
@@ -1,4 +1,4 @@
-# Copyright (c) 2009 The Chromium Authors. All rights reserved.
+# Copyright (c) 2010 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
@@ -24,6 +24,11 @@
         '..',
       ],
       'sources': [
+        'backend/print_backend.cc',
+        'backend/print_backend.h',
+        'backend/print_backend_consts.cc',
+        'backend/print_backend_consts.h',
+        'backend/print_backend_dummy.cc',
         'emf_win.cc',
         'emf_win.h',
         'image.cc',
@@ -40,29 +45,29 @@
         'page_range.h',
         'page_setup.cc',
         'page_setup.h',
-        'pdf_metafile_mac.h',
         'pdf_metafile_mac.cc',
-        'pdf_ps_metafile_cairo.h',
+        'pdf_metafile_mac.h',
         'pdf_ps_metafile_cairo.cc',
-        'print_settings.cc',
-        'print_settings.h',
-        'printed_document.cc',
+        'pdf_ps_metafile_cairo.h',
         'printed_document_cairo.cc',
+        'printed_document.cc',
+        'printed_document.h',
         'printed_document_mac.cc',
         'printed_document_posix.cc',
         'printed_document_win.cc',
-        'printed_document.h',
         'printed_page.cc',
         'printed_page.h',
         'printed_pages_source.h',
-        'printing_context.h',
-        'printing_context.cc',
-        'printing_context_cairo.h',
         'printing_context_cairo.cc',
+        'printing_context_cairo.h',
+        'printing_context.cc',
+        'printing_context.h',
         'printing_context_mac.h',
         'printing_context_mac.mm',
-        'printing_context_win.h',
         'printing_context_win.cc',
+        'printing_context_win.h',
+        'print_settings.cc',
+        'print_settings.h',
         'units.cc',
         'units.h',
       ],
@@ -88,6 +93,36 @@
             '../build/linux/system.gyp:gtkprint',
           ],
         }],
+        ['OS=="win"', {
+          'defines': [
+            # PRINT_BACKEND_AVAILABLE disables the default dummy implementation
+            # of the print backend and enables a custom implementation instead.
+            'PRINT_BACKEND_AVAILABLE',
+          ],
+          'sources': [
+            'backend/win_helper.cc',
+            'backend/win_helper.h',
+            'backend/print_backend_win.cc',
+          ],
+        }],
+        ['use_cups==1', {
+          'link_settings': {
+            'libraries': [
+              '-lcups',
+              '-lgcrypt',
+            ],
+          },
+          'defines': [
+            # PRINT_BACKEND_AVAILABLE disables the default dummy implementation
+            # of the print backend and enables a custom implementation instead.
+            'PRINT_BACKEND_AVAILABLE',
+          ],
+          'sources': [
+            'backend/cups_helper.cc',
+            'backend/cups_helper.h',
+            'backend/print_backend_cups.cc',
+          ],
+        }],
       ],
     },
     {