Clear old verified flush IDs when doing OrderingBarrier.

gpu/ipc/client/gpu_channel_host.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 GPU_IPC_CLIENT_GPU_CHANNEL_HOST_H_
 #define GPU_IPC_CLIENT_GPU_CHANNEL_HOST_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 69 matching lines @@
 
   // The GPU stats reported by the GPU process.
   const gpu::GPUInfo& gpu_info() const { return gpu_info_; }
 
   // IPC::Sender implementation:
   bool Send(IPC::Message* msg) override;
 
   // Set an ordering barrier.  AsyncFlushes any pending barriers on other
   // routes. Combines multiple OrderingBarriers into a single AsyncFlush.
   // Returns the flush ID for the stream or 0 if put offset was not changed.
+  // Outputs *highest_verified_flush_id.
   uint32_t OrderingBarrier(int32_t route_id,
                            int32_t stream_id,
                            int32_t put_offset,
                            uint32_t flush_count,
                            const std::vector<ui::LatencyInfo>& latency_info,
                            bool put_offset_changed,
-                           bool do_flush);
+                           bool do_flush,
+                           uint32_t* highest_verified_flush_id);
 
   void FlushPendingStream(int32_t stream_id);
 
   // Destroy this channel. Must be called on the main thread, before
   // destruction.
   void DestroyChannel();
 
   // Add a message route for the current message loop.
   void AddRoute(int route_id, base::WeakPtr<IPC::Listener> listener);
 
@@ skipping 160 matching lines @@
   mutable base::Lock context_lock_;
   std::unique_ptr<IPC::SyncChannel> channel_;
   base::hash_map<int32_t, StreamFlushInfo> stream_flush_info_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuChannelHost);
 };
 
 }  // namespace gpu
 
 #endif  // GPU_IPC_CLIENT_GPU_CHANNEL_HOST_H_