Highlights of changes:

1. Added entry to ResourceResponseHead so that it contains
   either a base::PlatformFile (OS_WIN) or
   base::FileDescriptor (OS_POSIX) for passing the file
   handle from browser to renderer process.
2. Also added IPC messages for reporting download progress
   and ACK message for it. ResourceLoaderBridge::Peer::OnDownloadProgress
   is added so that the peer is notified of the download
   progress in the renderer process.
3. Load flag to kick start the resource loading for media
   files. LOAD_MEDIA_RESOURCE is added so that
   ResourceDispatcherHost knows how to use a different
   ResourceHandler for handling media resource request.

Review URL: http://codereview.chromium.org/27168

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@10972 0039d316-1c4b-4281-b951-d872f2087c98

4 files changed, 20 insertions, 0 deletions

diff --git a/net/base/load_flags.h b/net/base/load_flags.h
index 7e3642a..7175713 100644
--- a/net/base/load_flags.h
+++ b/net/base/load_flags.h
@@ -37,6 +37,9 @@ enum {
   // If present, upload progress messages should be provided to initiator.
   LOAD_ENABLE_UPLOAD_PROGRESS = 1 << 6,
 
+  // If present, try to download the resource to a standalone file.
+  LOAD_ENABLE_DOWNLOAD_FILE = 1 << 7,
+
   // If present, ignores certificate mismatches with the domain name.
   // (The default behavior is to trigger an OnSSLCertificateError callback.)
   LOAD_IGNORE_CERT_COMMON_NAME_INVALID = 1 << 8,
diff --git a/net/http/http_cache.cc b/net/http/http_cache.cc
index 913dc00..e447031 100644
--- a/net/http/http_cache.cc
+++ b/net/http/http_cache.cc
@@ -606,6 +606,15 @@ void HttpCache::Transaction::SetRequest(const HttpRequestInfo* request) {
   if (cache_->mode() == RECORD)
     effective_load_flags_ |= LOAD_BYPASS_CACHE;
 
+  // If HttpCache has type MEDIA make sure LOAD_ENABLE_DOWNLOAD_FILE is set,
+  // otherwise make sure LOAD_ENABLE_DOWNLOAD_FILE is not set when HttpCache
+  // has type other than MEDIA.
+  if (cache_->type() == HttpCache::MEDIA) {
+    DCHECK(effective_load_flags_ & LOAD_ENABLE_DOWNLOAD_FILE);
+  } else {
+    DCHECK(!(effective_load_flags_ & LOAD_ENABLE_DOWNLOAD_FILE));
+  }
+
   // Some headers imply load flags.  The order here is significant.
   //
   //   LOAD_DISABLE_CACHE   : no cache read or write
diff --git a/net/http/http_cache_unittest.cc b/net/http/http_cache_unittest.cc
index 5db229b..7fc5e5c 100644
--- a/net/http/http_cache_unittest.cc
+++ b/net/http/http_cache_unittest.cc
@@ -1225,6 +1225,7 @@ TEST(HttpCache, SimpleGET_MediaCache) {
 #endif
 
   ScopedMockTransaction trans_info(kSimpleGET_Transaction);
+  trans_info.load_flags |= net::LOAD_ENABLE_DOWNLOAD_FILE;
   TestCompletionCallback callback;
 
   {
diff --git a/net/url_request/url_request.h b/net/url_request/url_request.h
index f4aee3a..fb25f45 100644
--- a/net/url_request/url_request.h
+++ b/net/url_request/url_request.h
@@ -307,6 +307,13 @@ class URLRequest {
     return response_info_.ssl_info;
   }
 
+  // Returns the platform specific file handle for the standalone file that
+  // contains response data. base::kInvalidPlatformFileValue is returned if
+  // such file is not available.
+  base::PlatformFile response_data_file() {
+    return response_info_.response_data_file;
+  }
+
   // Returns the cookie values included in the response, if the request is one
   // that can have cookies.  Returns true if the request is a cookie-bearing
   // type, false otherwise.  This method may only be called once the