cc: Avoid extra flush calls to Skia GrContext

cc/resources/resource_provider.h

 // Copyright 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 CC_RESOURCES_RESOURCE_PROVIDER_H_
 #define CC_RESOURCES_RESOURCE_PROVIDER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 24 matching lines @@
 #include "cc/resources/texture_mailbox.h"
 #include "cc/resources/transferable_resource.h"
 #include "third_party/khronos/GLES2/gl2.h"
 #include "third_party/khronos/GLES2/gl2ext.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/gfx/gpu_memory_buffer.h"
 
 class GrContext;
+class GrSurface;
 
 namespace gpu {
 class GpuMemoryBufferManager;
 namespace gles {
 class GLES2Interface;
 }
 }
 
 namespace gfx {
 class Rect;
@@ skipping 289 matching lines @@
 
     void UpdateResourceSyncToken(const gpu::SyncToken& sync_token) const {
       resource_->mailbox.set_sync_token(sync_token);
     }
 
    private:
     ResourceProvider* resource_provider_;
     ResourceProvider::Resource* resource_;
     base::ThreadChecker thread_checker_;
     skia::RefPtr<SkSurface> sk_surface_;
+    skia::RefPtr<GrSurface> gr_surface_;
 
     DISALLOW_COPY_AND_ASSIGN(ScopedWriteLockGr);
   };
 
   class Fence : public base::RefCounted<Fence> {
    public:
     Fence() {}
 
     virtual void Set() = 0;
     virtual bool HasPassed() = 0;
@@ skipping 258 matching lines @@
   // A process-unique ID used for disambiguating memory dumps from different
   // resource providers.
   int tracing_id_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourceProvider);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_RESOURCE_PROVIDER_H_