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 cb79b7e00f04bb72105c34591c02c116d1877446..b5560365fa7b9379b5fe8a5fb909d5aa69874379 100644
--- a/webkit/support/test_webkit_platform_support.cc
+++ b/webkit/support/test_webkit_platform_support.cc
@@ -12,6 +12,7 @@
 #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"
@@ -41,6 +42,7 @@
 #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"
@@ -378,6 +380,24 @@ TestWebKitPlatformSupport::createOffscreenGraphicsContext3D(
   return NULL;
 }
 
+WebKit::WebGraphicsContext3D*
+TestWebKitPlatformSupport::sharedOffscreenGraphicsContext3D() {
+  main_thread_contexts_ =
+      webkit::gpu::TestContextProviderFactory::GetInstance()->
+          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.