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 8e854dfc43f756d4dbefe1e8cc7985e72f7075b8..b139a78e5c4bfc803aa154083a69538b566a528d 100644
--- a/content/common/gpu/gpu_command_buffer_stub.h
+++ b/content/common/gpu/gpu_command_buffer_stub.h
@@ -202,6 +202,14 @@ 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 OnCreateImage(int32 id,
                      gfx::GpuMemoryBufferHandle handle,
                      gfx::Size size,
@@ -233,7 +241,9 @@ 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