cc: Refactor additional code from BuildRasterQueue.

cc/resources/tile_manager.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_TILE_MANAGER_H_
 #define CC_RESOURCES_TILE_MANAGER_H_
 
 #include <deque>
 #include <queue>
 #include <set>
@@ skipping 47 matching lines @@
   virtual scoped_ptr<RasterTilePriorityQueue> BuildRasterQueue(
       TreePriority tree_priority,
       RasterTilePriorityQueue::Type type) = 0;
 
   // Given an empty eviction tile priority queue, this will build a priority
   // queue that will return tiles in order in which they should be evicted.
   // Note if the queue was previous built, Reset must be called on it.
   virtual scoped_ptr<EvictionTilePriorityQueue> BuildEvictionQueue(
       TreePriority tree_priority) = 0;
 
+  // Informs the client that due to the currently rasterizing (or scheduled to
+  // be rasterized) tiles, we will be in a position that will likely require a
+  // draw. This can be used to preemptively start a frame.
+  virtual void SetIsLikelyToRequireADraw(bool is_likely_to_require_a_draw) = 0;
+
  protected:
   virtual ~TileManagerClient() {}
 };
 
 struct RasterTaskCompletionStats {
   RasterTaskCompletionStats();
 
   size_t completed_count;
   size_t canceled_count;
 };
@@ skipping 228 matching lines @@
 
   bool did_notify_ready_to_activate_;
   bool did_notify_ready_to_draw_;
 
   DISALLOW_COPY_AND_ASSIGN(TileManager);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_TILE_MANAGER_H_