Implemented new fence syncs which replaces the old sync points.

content/common/gpu/gpu_command_buffer_stub.h

Index: content/common/gpu/gpu_command_buffer_stub.h
diff --git a/content/common/gpu/gpu_command_buffer_stub.h b/content/common/gpu/gpu_command_buffer_stub.h
index 83025c82b1ca377ca45569a8204c3c704d197aad..b98190a07beb8e9c833786d9d759fea92645aa9c 100644
--- a/content/common/gpu/gpu_command_buffer_stub.h
+++ b/content/common/gpu/gpu_command_buffer_stub.h
@@ -203,6 +203,14 @@ class GpuCommandBufferStub
   void OnSignalSyncPointAck(uint32 id);
   void OnSignalQuery(uint32 query, uint32 id);
 
+  void OnFenceSyncRelease(uint64_t release);
+  bool OnWaitFenceSync(gpu::CommandBufferNamespace namespace_id,
+                       uint64_t command_buffer_id,
+                       uint64_t release);
+  void OnWaitFenceSyncCompleted(gpu::CommandBufferNamespace namespace_id,
+                                uint64_t command_buffer_id,
+                                uint64_t release);
+
   void OnSetClientHasMemoryAllocationChangedCallback(bool has_callback);
 
   void OnCreateImage(int32 id,
@@ -236,7 +244,10 @@ class GpuCommandBufferStub
 
   bool CheckContextLost();
   void CheckCompleteWaits();
-  void PullTextureUpdates(uint32 sync_point);
+  void PullTextureUpdates(gpu::CommandBufferNamespace namespace_id,
+                          uint64_t command_buffer_id,
+                          uint32_t release);
+
 
   // The lifetime of objects of this class is managed by a GpuChannel. The
   // GpuChannels destroy all the GpuCommandBufferStubs that they own when they