Implemented new fence syncs which replaces the old sync points.

content/common/gpu/client/command_buffer_proxy_impl.h

 // 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.
 
 #ifndef CONTENT_COMMON_GPU_CLIENT_COMMAND_BUFFER_PROXY_IMPL_H_
 #define CONTENT_COMMON_GPU_CLIENT_COMMAND_BUFFER_PROXY_IMPL_H_
 
 #include <map>
 #include <queue>
 #include <string>
@@ skipping 105 matching lines @@
   void RetireSyncPoint(uint32_t sync_point) override;
   void SignalSyncPoint(uint32 sync_point,
                        const base::Closure& callback) override;
   void SignalQuery(uint32 query, const base::Closure& callback) override;
   void SetSurfaceVisible(bool visible) override;
   uint32 CreateStreamTexture(uint32 texture_id) override;
   void SetLock(base::Lock* lock) override;
   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;
 
   bool ProduceFrontBuffer(const gpu::Mailbox& mailbox);
   void SetContextLostCallback(const base::Closure& callback);
 
   typedef base::Callback<void(const gpu::MemoryAllocation&)>
       MemoryAllocationChangedCallback;
   void SetMemoryAllocationChangedCallback(
       const MemoryAllocationChangedCallback& callback);
   void AddDeletionObserver(DeletionObserver* observer);
   void RemoveDeletionObserver(DeletionObserver* observer);
@@ skipping 53 matching lines @@
   void OnSetMemoryAllocation(const gpu::MemoryAllocation& allocation);
   void OnSignalSyncPointAck(uint32 id);
   void OnSwapBuffersCompleted(const std::vector<ui::LatencyInfo>& latency_info,
                               gfx::SwapResult result);
   void OnUpdateVSyncParameters(base::TimeTicks timebase,
                                base::TimeDelta interval);
 
   // Try to read an updated copy of the state from shared memory.
   void TryUpdateState();
 
+  // Updates the highest verified release fence sync.
+  void UpdateVerifiedReleases(uint32_t verified_flush);
+
   // The shared memory area used to update state.
   gpu::CommandBufferSharedState* shared_state() const;
 
   base::Lock* lock_;
 
   // Unowned list of DeletionObservers.
   base::ObserverList<DeletionObserver> deletion_observers_;
 
   // The last cached state received from the service.
   State last_state_;
 
   // The shared memory area used to update state.
   scoped_ptr<base::SharedMemory> shared_state_shm_;
 
   // |*this| is owned by |*channel_| and so is always outlived by it, so using a
   // raw pointer is ok.
   GpuChannelHost* channel_;
   const uint64_t command_buffer_id_;
   const int32 route_id_;
   const int32 stream_id_;
   uint32 flush_count_;
   int32 last_put_offset_;
   int32 last_barrier_put_offset_;
 
+  // Next generated fence sync.
+  uint64_t next_fence_sync_release_;
+
+  // Unverified flushed fence syncs with their corresponding flush id.
+  std::queue<std::pair<uint64_t, uint32_t>> flushed_release_flush_id_;
+
+  // Last flushed fence sync release, same as last item in queue if not empty.
+  uint64_t flushed_fence_sync_release_;
+
+  // Last verified fence sync.
+  uint64_t verified_fence_sync_release_;
+
   base::Closure context_lost_callback_;
 
   MemoryAllocationChangedCallback memory_allocation_changed_callback_;
 
   GpuConsoleMessageCallback console_message_callback_;
 
   // Tasks to be invoked in SignalSyncPoint responses.
   uint32 next_signal_id_;
   SignalTaskMap signal_tasks_;
 
   gpu::Capabilities capabilities_;
 
   std::vector<ui::LatencyInfo> latency_info_;
 
   SwapBuffersCompletionCallback swap_buffers_completion_callback_;
   UpdateVSyncParametersCallback update_vsync_parameters_completion_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(CommandBufferProxyImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_CLIENT_COMMAND_BUFFER_PROXY_IMPL_H_