Implemented new fence syncs which replaces the old sync points.

ppapi/proxy/ppapi_command_buffer_proxy.h

Index: ppapi/proxy/ppapi_command_buffer_proxy.h
diff --git a/ppapi/proxy/ppapi_command_buffer_proxy.h b/ppapi/proxy/ppapi_command_buffer_proxy.h
index ddb383891c12ab7a9ee078de325d8e09789a884b..dc48057912bd58ab970dc1cb866ba47c4afb67b7 100644
--- a/ppapi/proxy/ppapi_command_buffer_proxy.h
+++ b/ppapi/proxy/ppapi_command_buffer_proxy.h
@@ -70,6 +70,9 @@ class PPAPI_PROXY_EXPORT PpapiCommandBufferProxy : public gpu::CommandBuffer,
   bool IsGpuChannelLost() override;
   gpu::CommandBufferNamespace GetNamespaceID() const override;
   uint64_t GetCommandBufferID() const override;
+  uint64_t GenerateFenceSyncRelease() override;
+  bool IsFenceSyncRelease(uint64_t release) override;
+  bool IsFenceSyncFlushed(uint64_t release) override;
 
  private:
   bool Send(IPC::Message* msg);
@@ -96,6 +99,10 @@ class PPAPI_PROXY_EXPORT PpapiCommandBufferProxy : public gpu::CommandBuffer,
 
   InstanceData::FlushInfo *flush_info_;
 
+  uint64_t next_fence_sync_release_;
+  uint64_t pending_fence_sync_release_;
+  uint64_t flushed_fence_sync_release_;
+
   DISALLOW_COPY_AND_ASSIGN(PpapiCommandBufferProxy);
 };