Add the necessary plumbing mechanisms to ensure proper WebGL support inside the <browser> tag, whic…

webkit/plugins/ppapi/ppb_graphics_3d_impl.cc

Index: webkit/plugins/ppapi/ppb_graphics_3d_impl.cc
diff --git a/webkit/plugins/ppapi/ppb_graphics_3d_impl.cc b/webkit/plugins/ppapi/ppb_graphics_3d_impl.cc
index ce43dedeaa226afe23027a4db38955d0f033b615..19748b621fab9b85277e09cb64bc82df6950fc85 100644
--- a/webkit/plugins/ppapi/ppb_graphics_3d_impl.cc
+++ b/webkit/plugins/ppapi/ppb_graphics_3d_impl.cc
@@ -8,6 +8,7 @@
 #include "base/message_loop.h"
 #include "base/utf_string_conversions.h"
 #include "gpu/command_buffer/client/gles2_implementation.h"
+#include "gpu/ipc/command_buffer_proxy.h"
 #include "ppapi/c/ppp_graphics_3d.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebString.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebConsoleMessage.h"
@@ -76,7 +77,7 @@ PPB_Graphics3D_Impl::~PPB_Graphics3D_Impl() {
 
 // static
 PP_Resource PPB_Graphics3D_Impl::Create(PP_Instance instance,
-                                        PP_Resource share_context,
+                                        PPB_Graphics3D_API* share_context,
                                         const int32_t* attrib_list) {
   scoped_refptr<PPB_Graphics3D_Impl> graphics_3d(
       new PPB_Graphics3D_Impl(instance));
@@ -86,7 +87,7 @@ PP_Resource PPB_Graphics3D_Impl::Create(PP_Instance instance,
 }
 
 PP_Resource PPB_Graphics3D_Impl::CreateRaw(PP_Instance instance,
-                                           PP_Resource share_context,
+                                           PPB_Graphics3D_API* share_context,
                                            const int32_t* attrib_list) {
   scoped_refptr<PPB_Graphics3D_Impl> graphics_3d(
       new PPB_Graphics3D_Impl(instance));
@@ -199,7 +200,7 @@ int32 PPB_Graphics3D_Impl::DoSwapBuffers() {
   return PP_OK_COMPLETIONPENDING;
 }
 
-bool PPB_Graphics3D_Impl::Init(PP_Resource share_context,
+bool PPB_Graphics3D_Impl::Init(PPB_Graphics3D_API* share_context,
                                const int32_t* attrib_list) {
   if (!InitRaw(share_context, attrib_list))
     return false;
@@ -208,25 +209,34 @@ bool PPB_Graphics3D_Impl::Init(PP_Resource share_context,
   if (!command_buffer->Initialize())
     return false;
 
-  return CreateGLES2Impl(kCommandBufferSize, kTransferBufferSize);
+  gpu::gles2::GLES2Implementation* share_gles2 = NULL;
+  if (share_context) {
+    share_gles2 =
+        static_cast<PPB_Graphics3D_Shared*>(share_context)->gles2_impl();
+  }
+
+  return CreateGLES2Impl(kCommandBufferSize, kTransferBufferSize,
+                         share_gles2);
 }
 
-bool PPB_Graphics3D_Impl::InitRaw(PP_Resource share_context,
+bool PPB_Graphics3D_Impl::InitRaw(PPB_Graphics3D_API* share_context,
                                   const int32_t* attrib_list) {
   PluginInstance* plugin_instance = ResourceHelper::GetPluginInstance(this);
   if (!plugin_instance)
     return false;
 
-  // TODO(alokp): Support shared context.
-  DCHECK_EQ(0, share_context);
-  if (share_context != 0)
-    return false;
+  PluginDelegate::PlatformContext3D* share_platform_context = NULL;
+  if (share_context) {
+    PPB_Graphics3D_Impl* share_graphics =
+        static_cast<PPB_Graphics3D_Impl*>(share_context);
+    share_platform_context = share_graphics->platform_context();
+  }
 
   platform_context_.reset(plugin_instance->CreateContext3D());
   if (!platform_context_.get())
     return false;
 
-  if (!platform_context_->Init(attrib_list))
+  if (!platform_context_->Init(attrib_list, share_platform_context))
     return false;
 
   platform_context_->SetContextLostCallback(