Revert 106142 - Add a new globals object for PPAPI tracking information.

This adds a specialization on the host and plugin side of the proxy. This
replaces the ad-hoc singleton tracking done by the resource and var trackers
with just being getters on this global object.

Most code can use the single PpapiGlobals class. I also allow code to get the
host and plugin specializations since some code needs access to some specific
features of each side.

In a later pass I'll move the other stuff out of TrackerBase and delete it.

TEST=none
BUG=none

Review URL: http://codereview.chromium.org/8316008

TBR=brettw@chromium.org
Review URL: http://codereview.chromium.org/8342016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@106148 0039d316-1c4b-4281-b951-d872f2087c98

22 files changed, 147 insertions, 208 deletions

diff --git a/webkit/glue/webkit_glue.gypi b/webkit/glue/webkit_glue.gypi
index 6f9b624..6ccde32 100644
--- a/webkit/glue/webkit_glue.gypi
+++ b/webkit/glue/webkit_glue.gypi
@@ -204,8 +204,6 @@
         '../plugins/ppapi/file_type_conversions.cc',
         '../plugins/ppapi/file_type_conversions.h',
         '../plugins/ppapi/fullscreen_container.h',
-        '../plugins/ppapi/host_globals.cc',
-        '../plugins/ppapi/host_globals.h',
         '../plugins/ppapi/message_channel.cc',
         '../plugins/ppapi/message_channel.h',
         '../plugins/ppapi/npapi_glue.cc',
diff --git a/webkit/plugins/ppapi/callbacks_unittest.cc b/webkit/plugins/ppapi/callbacks_unittest.cc
index b11c725..30e534b 100644
--- a/webkit/plugins/ppapi/callbacks_unittest.cc
+++ b/webkit/plugins/ppapi/callbacks_unittest.cc
@@ -9,7 +9,6 @@
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_errors.h"
 #include "webkit/plugins/ppapi/callbacks.h"
-#include "webkit/plugins/ppapi/host_globals.h"
 #include "webkit/plugins/ppapi/mock_resource.h"
 #include "webkit/plugins/ppapi/plugin_module.h"
 #include "webkit/plugins/ppapi/ppapi_plugin_instance.h"
@@ -185,8 +184,7 @@ class CallbackResourceTest : public PpapiUnittest {
 
 // Test that callbacks get aborted on the last resource unref.
 TEST_F(CallbackResourceTest, AbortOnNoRef) {
-  ResourceTracker* resource_tracker =
-      HostGlobals::Get()->host_resource_tracker();
+  ResourceTracker* resource_tracker = ResourceTracker::Get();
 
   // Test several things: Unref-ing a resource (to zero refs) with callbacks
   // which (1) have been run, (2) have been aborted, (3) haven't been completed.
@@ -225,8 +223,7 @@ TEST_F(CallbackResourceTest, AbortOnNoRef) {
 // Test that "resurrecting" a resource (getting a new ID for a |Resource|)
 // doesn't resurrect callbacks.
 TEST_F(CallbackResourceTest, Resurrection) {
-  ResourceTracker* resource_tracker =
-      HostGlobals::Get()->host_resource_tracker();
+  ResourceTracker* resource_tracker = ResourceTracker::Get();
 
   scoped_refptr<CallbackMockResource> resource(
       new CallbackMockResource(instance()->pp_instance()));
diff --git a/webkit/plugins/ppapi/host_globals.cc b/webkit/plugins/ppapi/host_globals.cc
deleted file mode 100644
index 3a3626f..0000000
--- a/webkit/plugins/ppapi/host_globals.cc
+++ /dev/null
@@ -1,31 +0,0 @@
-// Copyright (c) 2011 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 "webkit/plugins/ppapi/host_globals.h"
-
-namespace webkit {
-namespace ppapi {
-
-HostGlobals* HostGlobals::host_globals_ = NULL;
-
-HostGlobals::HostGlobals() : ::ppapi::PpapiGlobals() {
-  DCHECK(!host_globals_);
-  host_globals_ = this;
-}
-
-HostGlobals::~HostGlobals() {
-  DCHECK(host_globals_ == this);
-  host_globals_ = NULL;
-}
-
-::ppapi::ResourceTracker* HostGlobals::GetResourceTracker() {
-  return &host_resource_tracker_;
-}
-
-::ppapi::VarTracker* HostGlobals::GetVarTracker() {
-  return &host_var_tracker_;
-}
-
-}  // namespace ppapi
-}  // namespace webkit
diff --git a/webkit/plugins/ppapi/host_globals.h b/webkit/plugins/ppapi/host_globals.h
deleted file mode 100644
index 69b18d0..0000000
--- a/webkit/plugins/ppapi/host_globals.h
+++ /dev/null
@@ -1,44 +0,0 @@
-// Copyright (c) 2011 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 WEBKIT_PLUGINS_PPAPI_HOST_GLOBALS_H_
-#define WEBKIT_PLUGINS_PPAPI_HOST_GLOBALS_H_
-
-#include "base/compiler_specific.h"
-#include "ppapi/shared_impl/ppapi_globals.h"
-#include "ppapi/shared_impl/var_tracker.h"
-#include "webkit/plugins/ppapi/resource_tracker.h"
-
-namespace webkit {
-namespace ppapi {
-
-class HostGlobals : public ::ppapi::PpapiGlobals {
- public:
-  HostGlobals();
-  virtual ~HostGlobals();
-
-  // Getter for the global singleton. Generally, you should use
-  // PpapiGlobals::Get() when possible. Use this only when you need some
-  // host-specific functionality.
-  inline static HostGlobals* Get() { return host_globals_; }
-
-  // PpapiGlobals implementation.
-  virtual ::ppapi::ResourceTracker* GetResourceTracker() OVERRIDE;
-  virtual ::ppapi::VarTracker* GetVarTracker() OVERRIDE;
-
-  ResourceTracker* host_resource_tracker() { return &host_resource_tracker_; }
-
- private:
-  static HostGlobals* host_globals_;
-
-  ResourceTracker host_resource_tracker_;
-  ::ppapi::VarTracker host_var_tracker_;
-
-  DISALLOW_COPY_AND_ASSIGN(HostGlobals);
-};
-
-}  // namespace ppapi
-}  // namespace webkit
-
-#endif   // WEBKIT_PLUGINS_PPAPI_HOST_GLOBALS_H_
diff --git a/webkit/plugins/ppapi/npapi_glue.cc b/webkit/plugins/ppapi/npapi_glue.cc
index dceb25b..cdb49d5 100644
--- a/webkit/plugins/ppapi/npapi_glue.cc
+++ b/webkit/plugins/ppapi/npapi_glue.cc
@@ -7,7 +7,6 @@
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/string_util.h"
-#include "webkit/plugins/ppapi/host_globals.h"
 #include "webkit/plugins/ppapi/npobject_var.h"
 #include "webkit/plugins/ppapi/plugin_module.h"
 #include "webkit/plugins/ppapi/plugin_object.h"
@@ -18,7 +17,6 @@
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebBindings.h"
 
 using ppapi::NPObjectVar;
-using ppapi::PpapiGlobals;
 using ppapi::StringVar;
 using ppapi::Var;
 using WebKit::WebBindings;
@@ -134,8 +132,8 @@ PP_Var NPIdentifierToPPVar(PP_Module module, NPIdentifier id) {
 PP_Var NPObjectToPPVar(PluginInstance* instance, NPObject* object) {
   DCHECK(object);
   scoped_refptr<NPObjectVar> object_var(
-      HostGlobals::Get()->host_resource_tracker()->NPObjectVarForNPObject(
-          instance->pp_instance(), object));
+      ResourceTracker::Get()->NPObjectVarForNPObject(instance->pp_instance(),
+                                                     object));
   if (!object_var) {  // No object for this module yet, make a new one.
     object_var = new NPObjectVar(instance->module()->pp_module(),
                                  instance->pp_instance(), object);
@@ -161,7 +159,7 @@ PPResultAndExceptionToNPResult::~PPResultAndExceptionToNPResult() {
   // been lost.
   DCHECK(checked_exception_);
 
-  PpapiGlobals::Get()->GetVarTracker()->ReleaseVar(exception_);
+  ResourceTracker::Get()->GetVarTracker()->ReleaseVar(exception_);
 }
 
 // Call this with the return value of the PPAPI function. It will convert
@@ -186,7 +184,7 @@ bool PPResultAndExceptionToNPResult::SetResult(PP_Var result) {
   // No matter what happened, we need to release the reference to the
   // value passed in. On success, a reference to this value will be in
   // the np_result_.
-  PpapiGlobals::Get()->GetVarTracker()->ReleaseVar(result);
+  ResourceTracker::Get()->GetVarTracker()->ReleaseVar(result);
   return success_;
 }
 
@@ -238,7 +236,7 @@ PPVarArrayFromNPVariantArray::PPVarArrayFromNPVariantArray(
 }
 
 PPVarArrayFromNPVariantArray::~PPVarArrayFromNPVariantArray() {
-  ::ppapi::VarTracker* var_tracker = PpapiGlobals::Get()->GetVarTracker();
+  ::ppapi::VarTracker* var_tracker = ResourceTracker::Get()->GetVarTracker();
   for (size_t i = 0; i < size_; i++)
     var_tracker->ReleaseVar(array_[i]);
 }
@@ -250,7 +248,7 @@ PPVarFromNPObject::PPVarFromNPObject(PluginInstance* instance, NPObject* object)
 }
 
 PPVarFromNPObject::~PPVarFromNPObject() {
-  PpapiGlobals::Get()->GetVarTracker()->ReleaseVar(var_);
+  ResourceTracker::Get()->GetVarTracker()->ReleaseVar(var_);
 }
 
 // NPObjectAccessorWithIdentifier ----------------------------------------------
@@ -270,7 +268,7 @@ NPObjectAccessorWithIdentifier::NPObjectAccessorWithIdentifier(
 }
 
 NPObjectAccessorWithIdentifier::~NPObjectAccessorWithIdentifier() {
-  PpapiGlobals::Get()->GetVarTracker()->ReleaseVar(identifier_);
+  ResourceTracker::Get()->GetVarTracker()->ReleaseVar(identifier_);
 }
 
 // TryCatch --------------------------------------------------------------------
diff --git a/webkit/plugins/ppapi/npobject_var.cc b/webkit/plugins/ppapi/npobject_var.cc
index f87bea4..e430dd2 100644
--- a/webkit/plugins/ppapi/npobject_var.cc
+++ b/webkit/plugins/ppapi/npobject_var.cc
@@ -7,10 +7,8 @@
 #include "base/logging.h"
 #include "ppapi/c/pp_var.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebBindings.h"
-#include "webkit/plugins/ppapi/host_globals.h"
 #include "webkit/plugins/ppapi/resource_tracker.h"
 
-using webkit::ppapi::HostGlobals;
 using WebKit::WebBindings;
 
 namespace ppapi {
@@ -24,12 +22,12 @@ NPObjectVar::NPObjectVar(PP_Module module,
       pp_instance_(instance),
       np_object_(np_object) {
   WebBindings::retainObject(np_object_);
-  HostGlobals::Get()->host_resource_tracker()->AddNPObjectVar(this);
+  webkit::ppapi::ResourceTracker::Get()->AddNPObjectVar(this);
 }
 
 NPObjectVar::~NPObjectVar() {
   if (pp_instance())
-    HostGlobals::Get()->host_resource_tracker()->RemoveNPObjectVar(this);
+    webkit::ppapi::ResourceTracker::Get()->RemoveNPObjectVar(this);
   WebBindings::releaseObject(np_object_);
 }
 
@@ -62,7 +60,7 @@ scoped_refptr<NPObjectVar> NPObjectVar::FromPPVar(PP_Var var) {
   if (var.type != PP_VARTYPE_OBJECT)
     return scoped_refptr<NPObjectVar>(NULL);
   scoped_refptr<Var> var_object(
-      PpapiGlobals::Get()->GetVarTracker()->GetVar(var));
+      webkit::ppapi::ResourceTracker::Get()->GetVarTracker()->GetVar(var));
   if (!var_object)
     return scoped_refptr<NPObjectVar>();
   return scoped_refptr<NPObjectVar>(var_object->AsNPObjectVar());
diff --git a/webkit/plugins/ppapi/plugin_module.cc b/webkit/plugins/ppapi/plugin_module.cc
index ce0cee2..f4db023 100644
--- a/webkit/plugins/ppapi/plugin_module.cc
+++ b/webkit/plugins/ppapi/plugin_module.cc
@@ -90,7 +90,6 @@
 #include "webkit/plugins/plugin_switches.h"
 #include "webkit/plugins/ppapi/callbacks.h"
 #include "webkit/plugins/ppapi/common.h"
-#include "webkit/plugins/ppapi/host_globals.h"
 #include "webkit/plugins/ppapi/ppapi_interface_factory.h"
 #include "webkit/plugins/ppapi/ppapi_plugin_instance.h"
 #include "webkit/plugins/ppapi/ppb_directory_reader_impl.h"
@@ -115,7 +114,6 @@
 #include "webkit/plugins/ppapi/resource_tracker.h"
 #include "webkit/plugins/ppapi/webkit_forwarding_impl.h"
 
-using ppapi::PpapiGlobals;
 using ppapi::TimeTicksToPPTimeTicks;
 using ppapi::TimeToPPTime;
 using ppapi::thunk::EnterResource;
@@ -126,14 +124,6 @@ namespace ppapi {
 
 namespace {
 
-// Global tracking info for PPAPI plugins. This is lazily created before the
-// first plugin is allocated, and leaked on shutdown.
-//
-// Note that we don't want a Singleton here since destroying this object will
-// try to free some stuff that requires WebKit, and Singletons are destroyed
-// after WebKit.
-webkit::ppapi::HostGlobals* host_globals = NULL;
-
 // Maintains all currently loaded plugin libs for validating PP_Module
 // identifiers.
 typedef std::set<PluginModule*> PluginModuleSet;
@@ -152,11 +142,11 @@ base::MessageLoopProxy* GetMainThreadMessageLoop() {
 // PPB_Core --------------------------------------------------------------------
 
 void AddRefResource(PP_Resource resource) {
-  PpapiGlobals::Get()->GetResourceTracker()->AddRefResource(resource);
+  ResourceTracker::Get()->AddRefResource(resource);
 }
 
 void ReleaseResource(PP_Resource resource) {
-  PpapiGlobals::Get()->GetResourceTracker()->ReleaseResource(resource);
+  ResourceTracker::Get()->ReleaseResource(resource);
 }
 
 PP_Time GetTime() {
@@ -215,8 +205,7 @@ void QuitMessageLoop(PP_Instance instance) {
 }
 
 uint32_t GetLiveObjectsForInstance(PP_Instance instance_id) {
-  return HostGlobals::Get()->host_resource_tracker()->GetLiveObjectsForInstance(
-      instance_id);
+  return ResourceTracker::Get()->GetLiveObjectsForInstance(instance_id);
 }
 
 PP_Bool IsOutOfProcess() {
@@ -382,12 +371,8 @@ PluginModule::PluginModule(const std::string& name,
       name_(name),
       path_(path),
       reserve_instance_id_(NULL) {
-  // Ensure the globals object is created.
-  if (!host_globals)
-    host_globals = new HostGlobals;
-
   memset(&entry_points_, 0, sizeof(entry_points_));
-  pp_module_ = HostGlobals::Get()->host_resource_tracker()->AddModule(this);
+  pp_module_ = ResourceTracker::Get()->AddModule(this);
   GetMainThreadMessageLoop();  // Initialize the main thread message loop.
   GetLivePluginSet()->insert(this);
 }
@@ -413,7 +398,7 @@ PluginModule::~PluginModule() {
     base::UnloadNativeLibrary(library_);
 
   // Notifications that we've been deleted should be last.
-  HostGlobals::Get()->host_resource_tracker()->ModuleDeleted(pp_module_);
+  ResourceTracker::Get()->ModuleDeleted(pp_module_);
   if (!is_crashed_) {
     // When the plugin crashes, we immediately tell the lifetime delegate that
     // we're gone, so we don't want to tell it again.
diff --git a/webkit/plugins/ppapi/plugin_object.cc b/webkit/plugins/ppapi/plugin_object.cc
index fbbd349..7b58456 100644
--- a/webkit/plugins/ppapi/plugin_object.cc
+++ b/webkit/plugins/ppapi/plugin_object.cc
@@ -15,7 +15,6 @@
 #include "ppapi/c/dev/ppp_class_deprecated.h"
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/c/pp_var.h"
-#include "ppapi/shared_impl/ppapi_globals.h"
 #include "ppapi/shared_impl/var.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebBindings.h"
 #include "webkit/plugins/ppapi/npapi_glue.h"
@@ -24,7 +23,6 @@
 #include "webkit/plugins/ppapi/resource_tracker.h"
 #include "webkit/plugins/ppapi/string.h"
 
-using ppapi::PpapiGlobals;
 using ppapi::StringVar;
 using ppapi::Var;
 using WebKit::WebBindings;
@@ -152,7 +150,7 @@ bool WrapperClass_SetProperty(NPObject* object, NPIdentifier property_name,
   accessor.object()->ppp_class()->SetProperty(
       accessor.object()->ppp_class_data(), accessor.identifier(), value_var,
       result_converter.exception());
-  PpapiGlobals::Get()->GetVarTracker()->ReleaseVar(value_var);
+  ResourceTracker::Get()->GetVarTracker()->ReleaseVar(value_var);
   return result_converter.CheckExceptionForNoResult();
 }
 
@@ -217,7 +215,7 @@ bool WrapperClass_Enumerate(NPObject* object, NPIdentifier** values,
 
   // Release the PP_Var that the plugin allocated. On success, they will all
   // be converted to NPVariants, and on failure, we want them to just go away.
-  ::ppapi::VarTracker* var_tracker = PpapiGlobals::Get()->GetVarTracker();
+  ::ppapi::VarTracker* var_tracker = ResourceTracker::Get()->GetVarTracker();
   for (uint32_t i = 0; i < property_count; ++i)
     var_tracker->ReleaseVar(properties[i]);
   free(properties);
diff --git a/webkit/plugins/ppapi/ppapi_plugin_instance.cc b/webkit/plugins/ppapi/ppapi_plugin_instance.cc
index 6e3be13..5ec687d 100644
--- a/webkit/plugins/ppapi/ppapi_plugin_instance.cc
+++ b/webkit/plugins/ppapi/ppapi_plugin_instance.cc
@@ -62,7 +62,6 @@
 #include "webkit/plugins/ppapi/common.h"
 #include "webkit/plugins/ppapi/event_conversion.h"
 #include "webkit/plugins/ppapi/fullscreen_container.h"
-#include "webkit/plugins/ppapi/host_globals.h"
 #include "webkit/plugins/ppapi/message_channel.h"
 #include "webkit/plugins/ppapi/npapi_glue.h"
 #include "webkit/plugins/ppapi/plugin_delegate.h"
@@ -103,7 +102,6 @@
 
 using base::StringPrintf;
 using ppapi::InputEventImpl;
-using ppapi::PpapiGlobals;
 using ppapi::StringVar;
 using ppapi::thunk::EnterResourceNoLock;
 using ppapi::thunk::PPB_Buffer_API;
@@ -244,8 +242,7 @@ void RectToPPRect(const gfx::Rect& input, PP_Rect* output) {
 // unchanged.
 bool SecurityOriginForInstance(PP_Instance instance_id,
                                WebKit::WebSecurityOrigin* security_origin) {
-  PluginInstance* instance =
-      HostGlobals::Get()->host_resource_tracker()->GetInstance(instance_id);
+  PluginInstance* instance = ResourceTracker::Get()->GetInstance(instance_id);
   if (!instance)
     return false;
 
@@ -309,7 +306,7 @@ PluginInstance::PluginInstance(
       text_input_caret_bounds_(0, 0, 0, 0),
       text_input_caret_set_(false),
       lock_mouse_callback_(PP_BlockUntilComplete()) {
-  pp_instance_ = HostGlobals::Get()->host_resource_tracker()->AddInstance(this);
+  pp_instance_ = ResourceTracker::Get()->AddInstance(this);
 
   memset(&current_print_settings_, 0, sizeof(current_print_settings_));
   DCHECK(delegate);
@@ -338,7 +335,7 @@ PluginInstance::~PluginInstance() {
   delegate_->InstanceDeleted(this);
   module_->InstanceDeleted(this);
 
-  HostGlobals::Get()->host_resource_tracker()->InstanceDeleted(pp_instance_);
+  ResourceTracker::Get()->InstanceDeleted(pp_instance_);
 }
 
 // NOTE: Any of these methods that calls into the plugin needs to take into
@@ -426,7 +423,7 @@ void PluginInstance::CommitBackingTexture() {
 
 void PluginInstance::InstanceCrashed() {
   // Force free all resources and vars.
-  HostGlobals::Get()->host_resource_tracker()->InstanceCrashed(pp_instance());
+  ResourceTracker::Get()->InstanceCrashed(pp_instance());
 
   // Free any associated graphics.
   SetFullscreen(false, false);
@@ -873,7 +870,7 @@ string16 PluginInstance::GetSelectedText(bool html) {
   if (string)
     selection = UTF8ToUTF16(string->value());
   // Release the ref the plugin transfered to us.
-  HostGlobals::Get()->GetVarTracker()->ReleaseVar(rv);
+  ResourceTracker::Get()->GetVarTracker()->ReleaseVar(rv);
   return selection;
 }
 
@@ -892,7 +889,7 @@ string16 PluginInstance::GetLinkAtPosition(const gfx::Point& point) {
   if (string)
     link = UTF8ToUTF16(string->value());
   // Release the ref the plugin transfered to us.
-  PpapiGlobals::Get()->GetVarTracker()->ReleaseVar(rv);
+  ResourceTracker::Get()->GetVarTracker()->ReleaseVar(rv);
   return link;
 }
 
diff --git a/webkit/plugins/ppapi/ppb_audio_impl.cc b/webkit/plugins/ppapi/ppb_audio_impl.cc
index ea73f38..e0f26e5 100644
--- a/webkit/plugins/ppapi/ppb_audio_impl.cc
+++ b/webkit/plugins/ppapi/ppb_audio_impl.cc
@@ -17,7 +17,6 @@
 #include "webkit/plugins/ppapi/common.h"
 #include "webkit/plugins/ppapi/resource_helper.h"
 
-using ppapi::PpapiGlobals;
 using ppapi::thunk::EnterResourceNoLock;
 using ppapi::thunk::PPB_Audio_API;
 using ppapi::thunk::PPB_AudioConfig_API;
@@ -95,7 +94,7 @@ bool PPB_Audio_Impl::Init(PP_Resource config,
 
 PP_Resource PPB_Audio_Impl::GetCurrentConfig() {
   // AddRef on behalf of caller, while keeping a ref for ourselves.
-  PpapiGlobals::Get()->GetResourceTracker()->AddRefResource(config_);
+  ::ppapi::TrackerBase::Get()->GetResourceTracker()->AddRefResource(config_);
   return config_;
 }
 
diff --git a/webkit/plugins/ppapi/ppb_directory_reader_impl.cc b/webkit/plugins/ppapi/ppb_directory_reader_impl.cc
index 63279cd..da7112b 100644
--- a/webkit/plugins/ppapi/ppb_directory_reader_impl.cc
+++ b/webkit/plugins/ppapi/ppb_directory_reader_impl.cc
@@ -9,7 +9,6 @@
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/dev/ppb_directory_reader_dev.h"
-#include "ppapi/shared_impl/ppapi_globals.h"
 #include "ppapi/thunk/enter.h"
 #include "ppapi/thunk/ppb_file_ref_api.h"
 #include "webkit/plugins/ppapi/common.h"
@@ -22,7 +21,6 @@
 #include "webkit/plugins/ppapi/resource_helper.h"
 #include "webkit/plugins/ppapi/resource_tracker.h"
 
-using ::ppapi::PpapiGlobals;
 using ::ppapi::thunk::EnterResourceNoLock;
 using ::ppapi::thunk::PPB_DirectoryReader_API;
 using ::ppapi::thunk::PPB_FileRef_API;
@@ -130,10 +128,8 @@ bool PPB_DirectoryReader_Impl::FillUpEntry() {
   if (!entries_.empty()) {
     base::FileUtilProxy::Entry dir_entry = entries_.front();
     entries_.pop();
-    if (entry_->file_ref) {
-      PpapiGlobals::Get()->GetResourceTracker()->ReleaseResource(
-          entry_->file_ref);
-    }
+    if (entry_->file_ref)
+      ResourceTracker::Get()->ReleaseResource(entry_->file_ref);
 
     PPB_FileRef_Impl* file_ref = PPB_FileRef_Impl::CreateInternal(
         directory_ref_->file_system()->pp_resource(),
diff --git a/webkit/plugins/ppapi/ppb_flash_clipboard_impl.cc b/webkit/plugins/ppapi/ppb_flash_clipboard_impl.cc
index fdffadf..73ad13e 100644
--- a/webkit/plugins/ppapi/ppb_flash_clipboard_impl.cc
+++ b/webkit/plugins/ppapi/ppb_flash_clipboard_impl.cc
@@ -18,7 +18,6 @@
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebKitPlatformSupport.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebString.h"
 #include "webkit/plugins/ppapi/common.h"
-#include "webkit/plugins/ppapi/host_globals.h"
 #include "webkit/plugins/ppapi/plugin_module.h"
 #include "webkit/plugins/ppapi/ppapi_plugin_instance.h"
 #include "webkit/plugins/ppapi/resource_tracker.h"
@@ -65,8 +64,7 @@ PP_Bool IsFormatAvailable(PP_Instance instance_id,
                           PP_Flash_Clipboard_Type clipboard_type,
                           PP_Flash_Clipboard_Format format) {
   // If you don't give us an instance, we don't give you anything.
-  PluginInstance* instance =
-      HostGlobals::Get()->host_resource_tracker()->GetInstance(instance_id);
+  PluginInstance* instance = ResourceTracker::Get()->GetInstance(instance_id);
   if (!instance)
     return PP_FALSE;
 
@@ -84,8 +82,7 @@ PP_Bool IsFormatAvailable(PP_Instance instance_id,
 
 PP_Var ReadPlainText(PP_Instance instance_id,
                      PP_Flash_Clipboard_Type clipboard_type) {
-  PluginInstance* instance =
-      HostGlobals::Get()->host_resource_tracker()->GetInstance(instance_id);
+  PluginInstance* instance = ResourceTracker::Get()->GetInstance(instance_id);
   if (!instance)
     return PP_MakeNull();
 
diff --git a/webkit/plugins/ppapi/ppb_flash_file_impl.cc b/webkit/plugins/ppapi/ppb_flash_file_impl.cc
index 47b18f8..de8b939 100644
--- a/webkit/plugins/ppapi/ppb_flash_file_impl.cc
+++ b/webkit/plugins/ppapi/ppb_flash_file_impl.cc
@@ -16,7 +16,6 @@
 #include "webkit/plugins/ppapi/common.h"
 #include "webkit/plugins/ppapi/file_path.h"
 #include "webkit/plugins/ppapi/file_type_conversions.h"
-#include "webkit/plugins/ppapi/host_globals.h"
 #include "webkit/plugins/ppapi/plugin_delegate.h"
 #include "webkit/plugins/ppapi/plugin_module.h"
 #include "webkit/plugins/ppapi/ppapi_plugin_instance.h"
@@ -67,8 +66,7 @@ int32_t OpenModuleLocalFile(PP_Instance pp_instance,
   if (!path || !PepperFileOpenFlagsToPlatformFileFlags(mode, &flags) || !file)
     return PP_ERROR_BADARGUMENT;
 
-  PluginInstance* instance =
-      HostGlobals::Get()->host_resource_tracker()->GetInstance(pp_instance);
+  PluginInstance* instance = ResourceTracker::Get()->GetInstance(pp_instance);
   if (!instance)
     return PP_ERROR_FAILED;
 
@@ -87,8 +85,7 @@ int32_t RenameModuleLocalFile(PP_Instance pp_instance,
   if (!from_path || !to_path)
     return PP_ERROR_BADARGUMENT;
 
-  PluginInstance* instance =
-      HostGlobals::Get()->host_resource_tracker()->GetInstance(pp_instance);
+  PluginInstance* instance = ResourceTracker::Get()->GetInstance(pp_instance);
   if (!instance)
     return PP_ERROR_FAILED;
 
@@ -104,8 +101,7 @@ int32_t DeleteModuleLocalFileOrDir(PP_Instance pp_instance,
   if (!path)
     return PP_ERROR_BADARGUMENT;
 
-  PluginInstance* instance =
-      HostGlobals::Get()->host_resource_tracker()->GetInstance(pp_instance);
+  PluginInstance* instance = ResourceTracker::Get()->GetInstance(pp_instance);
   if (!instance)
     return PP_ERROR_FAILED;
 
@@ -119,8 +115,7 @@ int32_t CreateModuleLocalDir(PP_Instance pp_instance, const char* path) {
   if (!path)
     return PP_ERROR_BADARGUMENT;
 
-  PluginInstance* instance =
-      HostGlobals::Get()->host_resource_tracker()->GetInstance(pp_instance);
+  PluginInstance* instance = ResourceTracker::Get()->GetInstance(pp_instance);
   if (!instance)
     return PP_ERROR_FAILED;
 
@@ -135,8 +130,7 @@ int32_t QueryModuleLocalFile(PP_Instance pp_instance,
   if (!path || !info)
     return PP_ERROR_BADARGUMENT;
 
-  PluginInstance* instance =
-      HostGlobals::Get()->host_resource_tracker()->GetInstance(pp_instance);
+  PluginInstance* instance = ResourceTracker::Get()->GetInstance(pp_instance);
   if (!instance)
     return PP_ERROR_FAILED;
 
@@ -163,8 +157,7 @@ int32_t GetModuleLocalDirContents(PP_Instance pp_instance,
                                   PP_DirContents_Dev** contents) {
   if (!path || !contents)
     return PP_ERROR_BADARGUMENT;
-  PluginInstance* instance =
-      HostGlobals::Get()->host_resource_tracker()->GetInstance(pp_instance);
+  PluginInstance* instance = ResourceTracker::Get()->GetInstance(pp_instance);
   if (!instance)
     return PP_ERROR_FAILED;
 
diff --git a/webkit/plugins/ppapi/ppb_flash_impl.cc b/webkit/plugins/ppapi/ppb_flash_impl.cc
index 78d5677..58354db 100644
--- a/webkit/plugins/ppapi/ppb_flash_impl.cc
+++ b/webkit/plugins/ppapi/ppb_flash_impl.cc
@@ -14,7 +14,6 @@
 #include "ppapi/shared_impl/var.h"
 #include "ppapi/thunk/enter.h"
 #include "webkit/plugins/ppapi/common.h"
-#include "webkit/plugins/ppapi/host_globals.h"
 #include "webkit/plugins/ppapi/plugin_delegate.h"
 #include "webkit/plugins/ppapi/plugin_module.h"
 #include "webkit/plugins/ppapi/ppapi_plugin_instance.h"
@@ -33,16 +32,14 @@ namespace ppapi {
 namespace {
 
 void SetInstanceAlwaysOnTop(PP_Instance pp_instance, PP_Bool on_top) {
-  PluginInstance* instance =
-      HostGlobals::Get()->host_resource_tracker()->GetInstance(pp_instance);
+  PluginInstance* instance = ResourceTracker::Get()->GetInstance(pp_instance);
   if (!instance)
     return;
   instance->set_always_on_top(PPBoolToBool(on_top));
 }
 
 PP_Var GetProxyForURL(PP_Instance pp_instance, const char* url) {
-  PluginInstance* instance =
-      HostGlobals::Get()->host_resource_tracker()->GetInstance(pp_instance);
+  PluginInstance* instance = ResourceTracker::Get()->GetInstance(pp_instance);
   if (!instance)
     return PP_MakeUndefined();
 
@@ -86,8 +83,7 @@ void QuitMessageLoop(PP_Instance instance) {
 }
 
 double GetLocalTimeZoneOffset(PP_Instance pp_instance, PP_Time t) {
-  PluginInstance* instance =
-      HostGlobals::Get()->host_resource_tracker()->GetInstance(pp_instance);
+  PluginInstance* instance = ResourceTracker::Get()->GetInstance(pp_instance);
   if (!instance)
     return 0.0;
 
@@ -105,8 +101,7 @@ double GetLocalTimeZoneOffset(PP_Instance pp_instance, PP_Time t) {
 }
 
 PP_Var GetCommandLineArgs(PP_Module pp_module) {
-  PluginModule* module =
-      HostGlobals::Get()->host_resource_tracker()->GetModule(pp_module);
+  PluginModule* module = ResourceTracker::Get()->GetModule(pp_module);
   if (!module)
     return PP_MakeUndefined();
 
diff --git a/webkit/plugins/ppapi/ppb_proxy_impl.cc b/webkit/plugins/ppapi/ppb_proxy_impl.cc
index 884ad7d..ece3410 100644
--- a/webkit/plugins/ppapi/ppb_proxy_impl.cc
+++ b/webkit/plugins/ppapi/ppb_proxy_impl.cc
@@ -7,13 +7,11 @@
 #include "ppapi/c/private/ppb_proxy_private.h"
 #include "ppapi/thunk/enter.h"
 #include "ppapi/thunk/ppb_image_data_api.h"
-#include "webkit/plugins/ppapi/host_globals.h"
 #include "webkit/plugins/ppapi/plugin_module.h"
 #include "webkit/plugins/ppapi/ppapi_plugin_instance.h"
 #include "webkit/plugins/ppapi/ppb_url_loader_impl.h"
 #include "webkit/plugins/ppapi/resource_tracker.h"
 
-using ppapi::PpapiGlobals;
 using ppapi::thunk::EnterResource;
 using ppapi::thunk::PPB_URLLoader_API;
 
@@ -23,15 +21,13 @@ namespace ppapi {
 namespace {
 
 void PluginCrashed(PP_Module module) {
-  PluginModule* plugin_module =
-      HostGlobals::Get()->host_resource_tracker()->GetModule(module);
+  PluginModule* plugin_module = ResourceTracker::Get()->GetModule(module);
   if (plugin_module)
     plugin_module->PluginCrashed();
 }
 
 PP_Instance GetInstanceForResource(PP_Resource resource) {
-  ::ppapi::Resource* obj =
-      PpapiGlobals::Get()->GetResourceTracker()->GetResource(resource);
+  ::ppapi::Resource* obj = ResourceTracker::Get()->GetResource(resource);
   if (!obj)
     return 0;
   return obj->pp_instance();
@@ -39,8 +35,7 @@ PP_Instance GetInstanceForResource(PP_Resource resource) {
 
 void SetReserveInstanceIDCallback(PP_Module module,
                                   PP_Bool (*reserve)(PP_Module, PP_Instance)) {
-  PluginModule* plugin_module =
-      HostGlobals::Get()->host_resource_tracker()->GetModule(module);
+  PluginModule* plugin_module = ResourceTracker::Get()->GetModule(module);
   if (plugin_module)
     plugin_module->SetReserveInstanceIDCallback(reserve);
 }
@@ -53,22 +48,19 @@ int32_t GetURLLoaderBufferedBytes(PP_Resource url_loader) {
 }
 
 void AddRefModule(PP_Module module) {
-  PluginModule* plugin_module =
-      HostGlobals::Get()->host_resource_tracker()->GetModule(module);
+  PluginModule* plugin_module = ResourceTracker::Get()->GetModule(module);
   if (plugin_module)
     plugin_module->AddRef();
 }
 
 void ReleaseModule(PP_Module module) {
-  PluginModule* plugin_module =
-      HostGlobals::Get()->host_resource_tracker()->GetModule(module);
+  PluginModule* plugin_module = ResourceTracker::Get()->GetModule(module);
   if (plugin_module)
     plugin_module->Release();
 }
 
 PP_Bool IsInModuleDestructor(PP_Module module) {
-  PluginModule* plugin_module =
-      HostGlobals::Get()->host_resource_tracker()->GetModule(module);
+  PluginModule* plugin_module = ResourceTracker::Get()->GetModule(module);
   if (plugin_module)
     return PP_FromBool(plugin_module->is_in_destructor());
   return PP_FALSE;
diff --git a/webkit/plugins/ppapi/ppb_var_impl.cc b/webkit/plugins/ppapi/ppb_var_impl.cc
index 59df63d..384d449 100644
--- a/webkit/plugins/ppapi/ppb_var_impl.cc
+++ b/webkit/plugins/ppapi/ppb_var_impl.cc
@@ -11,7 +11,6 @@
 #include "ppapi/c/pp_var.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebBindings.h"
 #include "webkit/plugins/ppapi/common.h"
-#include "webkit/plugins/ppapi/host_globals.h"
 #include "webkit/plugins/ppapi/npapi_glue.h"
 #include "webkit/plugins/ppapi/npobject_var.h"
 #include "webkit/plugins/ppapi/plugin_module.h"
@@ -21,7 +20,6 @@
 #include "v8/include/v8.h"
 
 using ppapi::NPObjectVar;
-using ppapi::PpapiGlobals;
 using ppapi::StringVar;
 using ppapi::Var;
 using WebKit::WebBindings;
@@ -126,8 +124,7 @@ class ObjectAccessorTryCatch : public TryCatch {
   NPObjectVar* object() { return object_.get(); }
 
   PluginInstance* GetPluginInstance() {
-    return HostGlobals::Get()->host_resource_tracker()->GetInstance(
-      object()->pp_instance());
+    return ResourceTracker::Get()->GetInstance(object()->pp_instance());
   }
 
  protected:
@@ -173,11 +170,11 @@ class ObjectAccessorWithIdentifierTryCatch : public ObjectAccessorTryCatch {
 // PPB_Var methods -------------------------------------------------------------
 
 void AddRefVar(PP_Var var) {
-  PpapiGlobals::Get()->GetVarTracker()->AddRefVar(var);
+  ResourceTracker::Get()->GetVarTracker()->AddRefVar(var);
 }
 
 void ReleaseVar(PP_Var var) {
-  PpapiGlobals::Get()->GetVarTracker()->ReleaseVar(var);
+  ResourceTracker::Get()->GetVarTracker()->ReleaseVar(var);
 }
 
 PP_Var VarFromUtf8(PP_Module module, const char* data, uint32_t len) {
@@ -407,11 +404,10 @@ bool IsInstanceOfDeprecated(PP_Var var,
                                     ppp_class, ppp_class_data);
 }
 
-PP_Var CreateObjectDeprecated(PP_Instance pp_instance,
+PP_Var CreateObjectDeprecated(PP_Instance instance_id,
                               const PPP_Class_Deprecated* ppp_class,
                               void* ppp_class_data) {
-  PluginInstance* instance =
-      HostGlobals::Get()->host_resource_tracker()->GetInstance(pp_instance);
+  PluginInstance* instance = ResourceTracker::Get()->GetInstance(instance_id);
   if (!instance) {
     DLOG(ERROR) << "Create object passed an invalid instance.";
     return PP_MakeNull();
@@ -419,11 +415,10 @@ PP_Var CreateObjectDeprecated(PP_Instance pp_instance,
   return PluginObject::Create(instance, ppp_class, ppp_class_data);
 }
 
-PP_Var CreateObjectWithModuleDeprecated(PP_Module pp_module,
+PP_Var CreateObjectWithModuleDeprecated(PP_Module module_id,
                                         const PPP_Class_Deprecated* ppp_class,
                                         void* ppp_class_data) {
-  PluginModule* module =
-      HostGlobals::Get()->host_resource_tracker()->GetModule(pp_module);
+  PluginModule* module = ResourceTracker::Get()->GetModule(module_id);
   if (!module)
     return PP_MakeNull();
   return PluginObject::Create(module->GetSomeInstance(),
diff --git a/webkit/plugins/ppapi/ppb_video_capture_impl.cc b/webkit/plugins/ppapi/ppb_video_capture_impl.cc
index 466125c..de97914 100644
--- a/webkit/plugins/ppapi/ppb_video_capture_impl.cc
+++ b/webkit/plugins/ppapi/ppb_video_capture_impl.cc
@@ -12,7 +12,6 @@
 #include "ppapi/c/dev/ppb_video_capture_dev.h"
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_errors.h"
-#include "ppapi/shared_impl/ppapi_globals.h"
 #include "ppapi/thunk/enter.h"
 #include "webkit/plugins/ppapi/common.h"
 #include "webkit/plugins/ppapi/plugin_module.h"
@@ -21,7 +20,6 @@
 #include "webkit/plugins/ppapi/resource_helper.h"
 #include "webkit/plugins/ppapi/resource_tracker.h"
 
-using ppapi::PpapiGlobals;
 using ppapi::thunk::EnterResourceNoLock;
 using ppapi::thunk::PPB_Buffer_API;
 using ppapi::thunk::PPB_VideoCapture_API;
@@ -267,7 +265,7 @@ void PPB_VideoCapture_Impl::OnDeviceInfoReceived(
     info.buffer = static_cast<PPB_Buffer_Impl*>(enter.object());
     info.data = info.buffer->Map();
     if (!info.data) {
-      PpapiGlobals::Get()->GetResourceTracker()->ReleaseResource(resources[i]);
+      ResourceTracker::Get()->ReleaseResource(resources[i]);
       break;
     }
     buffers_.push_back(info);
@@ -288,7 +286,7 @@ void PPB_VideoCapture_Impl::OnDeviceInfoReceived(
 
 void PPB_VideoCapture_Impl::ReleaseBuffers() {
   DCHECK(!is_dead_);
-  ::ppapi::ResourceTracker* tracker = PpapiGlobals::Get()->GetResourceTracker();
+  ResourceTracker *tracker = ResourceTracker::Get();
   for (size_t i = 0; i < buffers_.size(); ++i) {
     buffers_[i].buffer->Unmap();
     tracker->ReleaseResource(buffers_[i].buffer->pp_resource());
diff --git a/webkit/plugins/ppapi/quota_file_io.cc b/webkit/plugins/ppapi/quota_file_io.cc
index 37e58c0..73b20ca 100644
--- a/webkit/plugins/ppapi/quota_file_io.cc
+++ b/webkit/plugins/ppapi/quota_file_io.cc
@@ -12,7 +12,6 @@
 #include "base/message_loop_proxy.h"
 #include "base/stl_util.h"
 #include "base/task.h"
-#include "webkit/plugins/ppapi/host_globals.h"
 #include "webkit/plugins/ppapi/ppapi_plugin_instance.h"
 #include "webkit/plugins/ppapi/resource_helper.h"
 #include "webkit/plugins/ppapi/resource_tracker.h"
@@ -271,8 +270,7 @@ bool QuotaFileIO::WillSetLength(int64_t length,
 }
 
 PluginDelegate* QuotaFileIO::GetPluginDelegate() const {
-  PluginInstance* instance =
-      HostGlobals::Get()->host_resource_tracker()->GetInstance(pp_instance_);
+  PluginInstance* instance = ResourceTracker::Get()->GetInstance(pp_instance_);
   if (instance)
     return instance->delegate();
   return NULL;
diff --git a/webkit/plugins/ppapi/resource_helper.cc b/webkit/plugins/ppapi/resource_helper.cc
index cdea783..27f303d 100644
--- a/webkit/plugins/ppapi/resource_helper.cc
+++ b/webkit/plugins/ppapi/resource_helper.cc
@@ -6,7 +6,6 @@
 
 #include "base/logging.h"
 #include "ppapi/shared_impl/resource.h"
-#include "webkit/plugins/ppapi/host_globals.h"
 #include "webkit/plugins/ppapi/ppapi_plugin_instance.h"
 #include "webkit/plugins/ppapi/plugin_module.h"
 #include "webkit/plugins/ppapi/ppapi_plugin_instance.h"
@@ -18,7 +17,7 @@ namespace ppapi {
 // static
 PluginInstance* ResourceHelper::GetPluginInstance(
     const ::ppapi::Resource* resource) {
-  ResourceTracker* tracker = HostGlobals::Get()->host_resource_tracker();
+  ResourceTracker* tracker = ResourceTracker::Get();
   return tracker->GetInstance(resource->pp_instance());
 }
 
diff --git a/webkit/plugins/ppapi/resource_tracker.cc b/webkit/plugins/ppapi/resource_tracker.cc
index 0743723..6b0de7d 100644
--- a/webkit/plugins/ppapi/resource_tracker.cc
+++ b/webkit/plugins/ppapi/resource_tracker.cc
@@ -15,7 +15,6 @@
 #include "ppapi/shared_impl/id_assignment.h"
 #include "ppapi/shared_impl/tracker_base.h"
 #include "webkit/plugins/ppapi/callbacks.h"
-#include "webkit/plugins/ppapi/host_globals.h"
 #include "webkit/plugins/ppapi/npobject_var.h"
 #include "webkit/plugins/ppapi/plugin_module.h"
 #include "webkit/plugins/ppapi/ppapi_plugin_instance.h"
@@ -37,7 +36,7 @@ namespace ppapi {
 namespace {
 
 ::ppapi::TrackerBase* GetTrackerBase() {
-  return HostGlobals::Get()->host_resource_tracker();
+  return ResourceTracker::Get();
 }
 
 }  // namespace
@@ -62,6 +61,10 @@ struct ResourceTracker::InstanceData {
       function_proxies[::ppapi::proxy::INTERFACE_ID_COUNT];
 };
 
+// static
+ResourceTracker* ResourceTracker::global_tracker_ = NULL;
+ResourceTracker* ResourceTracker::singleton_override_ = NULL;
+
 ResourceTracker::ResourceTracker() {
   // Wire up the new shared resource tracker base to use our implementation.
   ::ppapi::TrackerBase::Init(&GetTrackerBase);
@@ -70,6 +73,15 @@ ResourceTracker::ResourceTracker() {
 ResourceTracker::~ResourceTracker() {
 }
 
+// static
+ResourceTracker* ResourceTracker::Get() {
+  if (singleton_override_)
+    return singleton_override_;
+  if (!global_tracker_)
+    global_tracker_ = new ResourceTracker;
+  return global_tracker_;
+}
+
 void ResourceTracker::CleanupInstanceData(PP_Instance instance,
                                           bool delete_instance) {
   DLOG_IF(ERROR, !CheckIdType(instance, ::ppapi::PP_ID_TYPE_INSTANCE))
@@ -142,6 +154,14 @@ void ResourceTracker::CleanupInstanceData(PP_Instance instance,
   return proxy.get();
 }
 
+::ppapi::VarTracker* ResourceTracker::GetVarTracker() {
+  return &var_tracker_;
+}
+
+::ppapi::ResourceTracker* ResourceTracker::GetResourceTracker() {
+  return this;
+}
+
 PP_Module ResourceTracker::GetModuleForInstance(PP_Instance instance) {
   PluginInstance* inst = GetInstance(instance);
   if (!inst)
@@ -289,5 +309,17 @@ PluginModule* ResourceTracker::GetModule(PP_Module module) {
   return found->second;
 }
 
+// static
+void ResourceTracker::SetSingletonOverride(ResourceTracker* tracker) {
+  DCHECK(!singleton_override_);
+  singleton_override_ = tracker;
+}
+
+// static
+void ResourceTracker::ClearSingletonOverride() {
+  DCHECK(singleton_override_);
+  singleton_override_ = NULL;
+}
+
 }  // namespace ppapi
 }  // namespace webkit
diff --git a/webkit/plugins/ppapi/resource_tracker.h b/webkit/plugins/ppapi/resource_tracker.h
index 221a8f9..79de8be 100644
--- a/webkit/plugins/ppapi/resource_tracker.h
+++ b/webkit/plugins/ppapi/resource_tracker.h
@@ -45,8 +45,8 @@ class ResourceTrackerTest;
 class ResourceTracker : public ::ppapi::TrackerBase,
                         public ::ppapi::ResourceTracker {
  public:
-  ResourceTracker();
-  virtual ~ResourceTracker();
+  // Returns the pointer to the singleton object.
+  static ResourceTracker* Get();
 
   // PP_Resources --------------------------------------------------------------
 
@@ -54,6 +54,8 @@ class ResourceTracker : public ::ppapi::TrackerBase,
   virtual ::ppapi::FunctionGroupBase* GetFunctionAPI(
       PP_Instance pp_instance,
       ::ppapi::proxy::InterfaceID id) OVERRIDE;
+  virtual ::ppapi::VarTracker* GetVarTracker() OVERRIDE;
+  virtual ::ppapi::ResourceTracker* GetResourceTracker() OVERRIDE;
   virtual PP_Module GetModuleForInstance(PP_Instance instance) OVERRIDE;
 
   // ppapi::ResourceTracker overrides.
@@ -117,11 +119,46 @@ class ResourceTracker : public ::ppapi::TrackerBase,
   // Per-instance data we track.
   struct InstanceData;
 
+  // Prohibit creation other then by the Singleton class.
+  ResourceTracker();
+  virtual ~ResourceTracker();
+
   // Force frees all vars and resources associated with the given instance.
   // If delete_instance is true, the instance tracking information will also
   // be deleted.
   void CleanupInstanceData(PP_Instance instance, bool delete_instance);
 
+  // Overrides the singleton object. This is used for tests which want to
+  // specify their own tracker (otherwise, you can get cross-talk between
+  // tests since the data will live into the subsequent tests).
+  static void SetSingletonOverride(ResourceTracker* tracker);
+  static void ClearSingletonOverride();
+
+  // The lazy-initialized global instance of this object. This is created in
+  // ::Get() if there is no singleton_override_ specified.
+  //
+  // It would be nice to use LazyInstance for this since it manages the
+  // creation properly, and also cleans up on shutdown. However, the shutdown
+  // cleanup causes problems in some cases.
+  //
+  // For example, say the browser crashes or is killed. The renderer then
+  // decides to exit. Normally resources are bound to an instance and are
+  // cleaned up when WebKit deletes the instance (when you go to a different
+  // page or close that view). In this case, WebKit doesn't clean up. If the
+  // ResourceTracker was cleaned up by the AtExitManager (which would be the
+  // case with LazyInstance/Singleton) then we'd try to call up to the renderer
+  // layer via the delegate, which may be in a random state of shutdown.
+  //
+  // So effectively our rule is: any resources still around at shutdown are
+  // associated with leaked plugins in WebKit, so it's also OK to leak those
+  // resources from here (avoiding the shutdown race).
+  static ResourceTracker* global_tracker_;
+
+  // See SetSingletonOverride above.
+  static ResourceTracker* singleton_override_;
+
+  ::ppapi::VarTracker var_tracker_;
+
   // Like ResourceAndRefCount but for vars, which are associated with modules.
   typedef std::pair<scoped_refptr< ::ppapi::Var>, size_t> VarAndRefCount;
   typedef base::hash_map<int32, VarAndRefCount> VarMap;
diff --git a/webkit/plugins/ppapi/resource_tracker_unittest.cc b/webkit/plugins/ppapi/resource_tracker_unittest.cc
index 68a4b2f..0b418bb 100644
--- a/webkit/plugins/ppapi/resource_tracker_unittest.cc
+++ b/webkit/plugins/ppapi/resource_tracker_unittest.cc
@@ -9,7 +9,6 @@
 #include "ppapi/c/ppp_instance.h"
 #include "third_party/npapi/bindings/npruntime.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebBindings.h"
-#include "webkit/plugins/ppapi/host_globals.h"
 #include "webkit/plugins/ppapi/mock_plugin_delegate.h"
 #include "webkit/plugins/ppapi/mock_resource.h"
 #include "webkit/plugins/ppapi/npapi_glue.h"
@@ -79,9 +78,23 @@ class ResourceTrackerTest : public PpapiUnittest {
   ResourceTrackerTest() {
   }
 
-  ResourceTracker& tracker() {
-    return *HostGlobals::Get()->host_resource_tracker();
+  virtual void SetUp() {
+    // The singleton override must be installed before the generic setup because
+    // that creates an instance, etc. which uses the tracker.
+    ResourceTracker::SetSingletonOverride(&tracker_);
+    PpapiUnittest::SetUp();
   }
+  virtual void TearDown() {
+    // Must do normal tear down before clearing the override for the same rason
+    // as the SetUp.
+    PpapiUnittest::TearDown();
+    ResourceTracker::ClearSingletonOverride();
+  }
+
+  ResourceTracker& tracker() { return tracker_; }
+
+ private:
+  ResourceTracker tracker_;
 };
 
 TEST_F(ResourceTrackerTest, DeleteObjectVarWithInstance) {
@@ -125,8 +138,7 @@ TEST_F(ResourceTrackerTest, ReuseVar) {
   }
 
   // Remove both of the refs we made above.
-  ::ppapi::VarTracker* var_tracker =
-      ::ppapi::PpapiGlobals::Get()->GetVarTracker();
+  ::ppapi::VarTracker* var_tracker = tracker().GetVarTracker();
   var_tracker->ReleaseVar(static_cast<int32_t>(pp_object2.value.as_id));
   var_tracker->ReleaseVar(static_cast<int32_t>(pp_object1.value.as_id));