Refactoring code with existing function.

this patch is for small refactoring the code by
using existing function which has the same purpose.
(FreeResourcesForTileAndNotifyClientIfTileWasReadyToDraw)

Bug=None
TEST=cc_unittests

Review URL: https://codereview.chromium.org/471633002

Cr-Commit-Position: refs/heads/master@{#289876}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@289876 0039d316-1c4b-4281-b951-d872f2087c98

cc/resources/tile_manager.cc

@@ -843,9 +843,7 @@ void TileManager::AssignGpuMemoryToTiles(
 
     // Tile is OOM.
     if (tile_bytes > tile_bytes_left || tile_resources > resources_left) {
-      bool was_ready_to_draw = tile->IsReadyToDraw();
-
-      FreeResourcesForTile(tile);
+      FreeResourcesForTileAndNotifyClientIfTileWasReadyToDraw(tile);
 
       // This tile was already on screen and now its resources have been
       // released. In order to prevent checkerboarding, set this tile as
@@ -853,9 +851,6 @@ void TileManager::AssignGpuMemoryToTiles(
       if (mts.visible_and_ready_to_draw)
         tile_version.set_rasterize_on_demand();
 
-      if (was_ready_to_draw)
-        client_->NotifyTileStateChanged(tile);
-
       oomed_soft = true;
       if (tile_uses_hard_limit) {
         oomed_hard = true;