cc: Refactor additional code from BuildRasterQueue.

cc/resources/tile_manager.h

Index: cc/resources/tile_manager.h
diff --git a/cc/resources/tile_manager.h b/cc/resources/tile_manager.h
index 0e672e577976ea41ba426926b184ec1ca4dfc520..e9f007336bc46b7c785fe90bf24b0ba0a25a60cb 100644
--- a/cc/resources/tile_manager.h
+++ b/cc/resources/tile_manager.h
@@ -70,6 +70,11 @@ class CC_EXPORT TileManagerClient {
   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() {}
 };