cc: Refactor additional code from BuildRasterQueue.

cc/resources/tile_manager.cc

Index: cc/resources/tile_manager.cc
diff --git a/cc/resources/tile_manager.cc b/cc/resources/tile_manager.cc
index f5c61f3d6e33b7d97e086e47730889a61576fd1e..1e2cfc1da5b728b277f2784d826f0a40e112bca4 100644
--- a/cc/resources/tile_manager.cc
+++ b/cc/resources/tile_manager.cc
@@ -362,6 +362,11 @@ void TileManager::PrepareTiles(
     scoped_ptr<RasterTilePriorityQueue> raster_priority_queue(
         client_->BuildRasterQueue(global_state_.tree_priority,
                                   RasterTilePriorityQueue::Type::ALL));
+    // Inform the client that will likely require a draw if the top tile is
+    // required for draw.
+    client_->SetIsLikelyToRequireADraw(
+        !raster_priority_queue->IsEmpty() &&
+        raster_priority_queue->Top()->required_for_draw());
     AssignGpuMemoryToTiles(raster_priority_queue.get(),
                            scheduled_raster_task_limit_,
                            &tiles_that_need_to_be_rasterized);