A host of micro-optimizations and a refactor of TimeForBoundsToIntersect

cc/tile_manager.h

Index: cc/tile_manager.h
diff --git a/cc/tile_manager.h b/cc/tile_manager.h
index 465ca5e40a9ad84ae0749b1b9fd91c2fa928ff38..21f922262c42ff6a2c22cee761851fe88b6e7e91 100644
--- a/cc/tile_manager.h
+++ b/cc/tile_manager.h
@@ -96,13 +96,22 @@ class CC_EXPORT TileManager {
   void RegisterTile(Tile* tile);
   void UnregisterTile(Tile* tile);
   void WillModifyTilePriority(
-      Tile* tile, WhichTree tree, const TilePriority& new_priority);
+      Tile* tile, WhichTree tree, const TilePriority& new_priority) {
+    // TODO(nduca): Do something smarter if reprioritization turns out to be
+    // costly.
+    ScheduleManageTiles();
+  }
 
  private:
   void SortTiles();
   void AssignGpuMemoryToTiles();
   void FreeResourcesForTile(Tile* tile);
-  void ScheduleManageTiles();
+  void ScheduleManageTiles() {
+    if (manage_tiles_pending_)
+      return;
+    client_->ScheduleManageTiles();
+    manage_tiles_pending_ = true;
+  }
   void DispatchMoreTasks();
   void GatherPixelRefsForTile(Tile* tile);
   void DispatchImageDecodeTasksForTile(Tile* tile);