cc: GPU rasterize tiles synchronously in PrepareToDraw

cc/resources/rasterizer.h

 // Copyright 2014 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_RASTERIZER_H_
 #define CC_RESOURCES_RASTERIZER_H_
 
 #include <bitset>
 #include <vector>
 
@@ skipping 131 matching lines @@
 class CC_EXPORT Rasterizer {
  public:
   // Set the client instance to be notified when finished running tasks.
   virtual void SetClient(RasterizerClient* client) = 0;
 
   // Tells the worker pool to shutdown after canceling all previously scheduled
   // tasks. Reply callbacks are still guaranteed to run when
   // CheckForCompletedTasks() is called.
   virtual void Shutdown() = 0;
 
+  // Run all raster tasks in |queue| synchronously.
+  virtual void RunTasks(RasterTaskQueue* queue) = 0;
+
   // Schedule running of raster tasks in |queue| and all dependencies.
   // Previously scheduled tasks that are not in |queue| will be canceled unless
   // already running. Once scheduled, reply callbacks are guaranteed to run for
   // all tasks even if they later get canceled by another call to
   // ScheduleTasks().
   virtual void ScheduleTasks(RasterTaskQueue* queue) = 0;
 
   // Check for completed tasks and dispatch reply callbacks.
   virtual void CheckForCompletedTasks() = 0;
 
  protected:
   virtual ~Rasterizer() {}
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_RASTERIZER_H_