Implement the Platform::sharedOffscreenGraphicsContext3D method.

webkit/support/test_webkit_platform_support.cc

Index: webkit/support/test_webkit_platform_support.cc
diff --git a/webkit/support/test_webkit_platform_support.cc b/webkit/support/test_webkit_platform_support.cc
index b61c701853de30538d24ee4f878aaa0260c871cd..23c36fc6e26a7d4b6295c09e171137538b33a80f 100644
--- a/webkit/support/test_webkit_platform_support.cc
+++ b/webkit/support/test_webkit_platform_support.cc
@@ -11,6 +11,7 @@
 #include "base/path_service.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
+#include "cc/context_provider.h"
 #include "cc/thread_impl.h"
 #include "media/base/media.h"
 #include "net/cookies/cookie_monster.h"
@@ -40,6 +41,7 @@
 #include "webkit/glue/webclipboard_impl.h"
 #include "webkit/glue/webkit_glue.h"
 #include "webkit/glue/webkitplatformsupport_impl.h"
+#include "webkit/gpu/test_context_provider_factory.h"
 #include "webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.h"
 #include "webkit/gpu/webgraphicscontext3d_in_process_impl.h"
 #include "webkit/plugins/npapi/plugin_list.h"
@@ -73,7 +75,8 @@ TestWebKitPlatformSupport::TestWebKitPlatformSupport(bool unit_test_mode,
     WebKit::Platform* shadow_platform_delegate)
     : unit_test_mode_(unit_test_mode),
       shadow_platform_delegate_(shadow_platform_delegate),
-      hyphen_dictionary_(NULL) {
+      hyphen_dictionary_(NULL),
+      context_provider_factory_(NULL) {
   v8::V8::SetCounterFunction(base::StatsTable::FindLocation);
 
   WebKit::initialize(this);
@@ -157,6 +160,8 @@ TestWebKitPlatformSupport::TestWebKitPlatformSupport(bool unit_test_mode,
 TestWebKitPlatformSupport::~TestWebKitPlatformSupport() {
   if (hyphen_dictionary_)
     hnj_hyphen_free(hyphen_dictionary_);
+  if (context_provider_factory_)
+    webkit::gpu::TestContextProviderFactory::DestroyInstance();
 }
 
 WebKit::WebMimeRegistry* TestWebKitPlatformSupport::mimeRegistry() {
@@ -377,6 +382,28 @@ TestWebKitPlatformSupport::createOffscreenGraphicsContext3D(
   return NULL;
 }
 
+WebKit::WebGraphicsContext3D*
+TestWebKitPlatformSupport::sharedOffscreenGraphicsContext3D() {
+  if (!context_provider_factory_) {
+    context_provider_factory_ =
+        webkit::gpu::TestContextProviderFactory::GetInstance();
+  }
+
+  main_thread_contexts_ =
+      context_provider_factory_->OffscreenContextProviderForMainThread();
+  if (!main_thread_contexts_->InitializeOnMainThread())
+    return NULL;
+  if (!main_thread_contexts_->BindToCurrentThread())
+    return NULL;
+  return main_thread_contexts_->Context3d();
+}
+
+GrContext* TestWebKitPlatformSupport::sharedOffscreenGrContext() {
+  if (!main_thread_contexts_)
+    return NULL;
+  return main_thread_contexts_->GrContext();
+}
+
 bool TestWebKitPlatformSupport::canAccelerate2dCanvas() {
   // We supply an OS-MESA based context for accelarated 2d
   // canvas, which should always work.