cc: Use CHROMIUM_copy_image for one-copy tile updates.

cc/raster/staging_buffer_pool.h

 // Copyright 2016 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 CC_RASTER_STAGING_BUFFER_POOL_H_
 #define CC_RASTER_STAGING_BUFFER_POOL_H_
 
 #include <stdint.h>
 
 #include <deque>
 #include <memory>
 #include <set>
 
 #include "base/macros.h"
 #include "base/memory/memory_coordinator_client.h"
 #include "base/memory/weak_ptr.h"
 #include "base/synchronization/lock.h"
 #include "base/time/time.h"
 #include "base/trace_event/memory_dump_provider.h"
 #include "base/trace_event/trace_event.h"
 #include "cc/output/context_provider.h"
 #include "cc/resources/resource_provider.h"
 
+namespace gfx {
+class GpuFence;
+}
+
 namespace gpu {
 namespace gles2 {
 class GLES2Interface;
 }
 }
 
 namespace cc {
 class Resource;
 class RasterSource;
 class ResourcePool;
 
 struct StagingBuffer {
   StagingBuffer(const gfx::Size& size, ResourceFormat format);
   ~StagingBuffer();
 
   void DestroyGLResources(gpu::gles2::GLES2Interface* gl);
   void OnMemoryDump(base::trace_event::ProcessMemoryDump* pmd,
                     ResourceFormat format,
                     bool is_free) const;
 
   const gfx::Size size;
   const ResourceFormat format;
   std::unique_ptr<gfx::GpuMemoryBuffer> gpu_memory_buffer;
+  std::unique_ptr<gfx::GpuFence> gpu_fence;
   base::TimeTicks last_usage;
-  unsigned texture_id;
   unsigned image_id;
-  unsigned query_id;
+  unsigned fence_id;
   uint64_t content_id;
 };
 
 class CC_EXPORT StagingBufferPool
     : public base::trace_event::MemoryDumpProvider,
       public base::MemoryCoordinatorClient {
  public:
   ~StagingBufferPool() final;
 
   StagingBufferPool(base::SequencedTaskRunner* task_runner,
@@ skipping 53 matching lines @@
   base::Closure reduce_memory_usage_callback_;
 
   base::WeakPtrFactory<StagingBufferPool> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(StagingBufferPool);
 };
 
 }  // namespace cc
 
 #endif  // CC_RASTER_STAGING_BUFFER_POOL_H_