gpu: GPU service scheduler.

cc/raster/raster_buffer_provider.h

 // Copyright 2013 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_RASTER_BUFFER_PROVIDER_H_
 #define CC_RASTER_RASTER_BUFFER_PROVIDER_H_
 
 #include <stddef.h>
 
 #include "cc/raster/raster_buffer.h"
@@ skipping 36 matching lines @@
       const Resource* resource,
       uint64_t resource_content_id,
       uint64_t previous_content_id) = 0;
 
   // Release raster buffer.
   virtual void ReleaseBufferForRaster(std::unique_ptr<RasterBuffer> buffer) = 0;
 
   // Used for syncing resources to the worker context.
   virtual void OrderingBarrier() = 0;
 
+  // In addition to above, also ensures that pending work is sent to the GPU
+  // process.
+  virtual void Flush() = 0;
+
   // Returns the format to use for the tiles.
   virtual ResourceFormat GetResourceFormat(bool must_support_alpha) const = 0;
 
   // Determine if the resource requires swizzling.
   virtual bool IsResourceSwizzleRequired(bool must_support_alpha) const = 0;
 
   // Determine if the RasterBufferProvider can handle partial raster into
   // the Resource provided in AcquireBufferForRaster.
   virtual bool CanPartialRasterIntoProvidedResource() const = 0;
 
@@ skipping 15 matching lines @@
   virtual void Shutdown() = 0;
 
  protected:
   // Check if resource format matches output format.
   static bool ResourceFormatRequiresSwizzle(ResourceFormat format);
 };
 
 }  // namespace cc
 
 #endif  // CC_RASTER_RASTER_BUFFER_PROVIDER_H_