cc: Free gpu resources when we are invisible or TM is oom.

cc/resources/gpu_rasterizer.h

 // Copyright 2015 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_GPU_RASTERIZER_H_
 #define CC_RESOURCES_GPU_RASTERIZER_H_
 
 #include <vector>
 
 #include "cc/base/cc_export.h"
@@ skipping 26 matching lines @@
       ResourceFormat resource_format,
       const UpdateTileDrawInfoCallback& update_tile_draw_info) override;
 
   void RasterizeSource(bool use_worker_context,
                        ResourceProvider::ScopedWriteLockGr* write_lock,
                        const RasterSource* raster_source,
                        const gfx::Rect& rect,
                        float scale);
 
   ResourceProvider* resource_provider() { return resource_provider_; }
+  void ClearCache();
 
  private:
   GpuRasterizer(ContextProvider* context_provider,
                 ResourceProvider* resource_provider,
                 bool use_distance_filed_text,
                 bool threaded_gpu_rasterization_enabled,
                 int msaa_sample_count);
 
   using ScopedResourceWriteLocks =
       ScopedPtrVector<ResourceProvider::ScopedWriteLockGr>;
@@ skipping 11 matching lines @@
   bool use_distance_field_text_;
   bool threaded_gpu_rasterization_enabled_;
   int msaa_sample_count_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuRasterizer);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_GPU_RASTERIZER_H_