Revert "Revert 130384 - Broke a few Mac bots"

webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.cc

 // Copyright (c) 2012 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/gpu/webgraphicscontext3d_in_process_command_buffer_impl.h"
 
 #include <GLES2/gl2.h>
 #ifndef GL_GLEXT_PROTOTYPES
 #define GL_GLEXT_PROTOTYPES 1
 #endif
@@ skipping 444 matching lines @@
     Destroy();
     return false;
   }
 
   // Create a transfer buffer.
   transfer_buffer_.reset(new TransferBuffer(gles2_helper_.get()));
 
   // Create the object exposing the OpenGL API.
   gles2_implementation_.reset(new GLES2Implementation(
       gles2_helper_.get(),
-      NULL,
+      context_group ? context_group->GetImplementation()->share_group() : NULL,
       transfer_buffer_.get(),
       true,
       false));
 
   if (!gles2_implementation_->Initialize(
       kStartTransferBufferSize,
       kMinTransferBufferSize,
       kMaxTransferBufferSize)) {
     return false;
   }
@@ skipping 1125 matching lines @@
 void WebGraphicsContext3DInProcessCommandBufferImpl::OnContextLost() {
   // TODO(kbr): improve the precision here.
   context_lost_reason_ = GL_UNKNOWN_CONTEXT_RESET_ARB;
   if (context_lost_callback_) {
     context_lost_callback_->onContextLost();
   }
 }
 
 }  // namespace gpu
 }  // namespace webkit