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

content/renderer/pepper/pepper_platform_context_3d_impl.cc

Index: content/renderer/pepper/pepper_platform_context_3d_impl.cc
diff --git a/content/renderer/pepper/pepper_platform_context_3d_impl.cc b/content/renderer/pepper/pepper_platform_context_3d_impl.cc
index 8e2f96abf6f2de12b1424b931ab4db3ee9cd912e..670e9ab1acfd82a3e9429648ccc5047f40e240a4 100644
--- a/content/renderer/pepper/pepper_platform_context_3d_impl.cc
+++ b/content/renderer/pepper/pepper_platform_context_3d_impl.cc
@@ -51,7 +51,8 @@ PlatformContext3DImpl::~PlatformContext3DImpl() {
   channel_ = NULL;
 }
 
-bool PlatformContext3DImpl::Init(const int32* attrib_list) {
+bool PlatformContext3DImpl::Init(const int32* attrib_list,
+                                 PlatformContext3D* share_context) {
   // Ignore initializing more than once.
   if (command_buffer_)
     return true;
@@ -114,9 +115,16 @@ bool PlatformContext3DImpl::Init(const int32* attrib_list) {
     attribs.push_back(PP_GRAPHICS3DATTRIB_NONE);
   }
 
+  CommandBufferProxy* share_buffer = NULL;
+  if (share_context) {
+    PlatformContext3DImpl* share_impl =
+        static_cast<PlatformContext3DImpl*>(share_context);
+    share_buffer = share_impl->command_buffer_;
+  }
+
   command_buffer_ = channel_->CreateOffscreenCommandBuffer(
       surface_size,
-      NULL,
+      share_buffer,
       "*",
       attribs,
       GURL::EmptyGURL(),