cc: Add checker-imaging support to TileManager.

cc/tiles/picture_layer_tiling_set.cc

Index: cc/tiles/picture_layer_tiling_set.cc
diff --git a/cc/tiles/picture_layer_tiling_set.cc b/cc/tiles/picture_layer_tiling_set.cc
index 82cf8e0405b102c2348b5f1bf1a550c3f77ec1cf..f4c9bcc69c824d4effb072a8cb60c1b352fb9c10 100644
--- a/cc/tiles/picture_layer_tiling_set.cc
+++ b/cc/tiles/picture_layer_tiling_set.cc
@@ -195,6 +195,15 @@ void PictureLayerTilingSet::UpdateRasterSourceDueToLCDChange(
   }
 }
 
+void PictureLayerTilingSet::UpdateTilingsForImplSideInvalidation(

[vmpstr, 2017/02/03 23:42:32]

Invalidate?

[Khushal, 2017/02/07 00:25:32]

You mean InvalidateTilings...? I kept it consistent with other function names
above.

+    const Region& layer_invalidation) {
+  for (const auto& tiling : tilings_) {
+    tiling->Invalidate(layer_invalidation);
+    state_since_last_tile_priority_update_.invalidated = true;
+    tiling->CreateMissingTilesInLiveTilesRect();
+  }
+}
+
 void PictureLayerTilingSet::VerifyTilings(
     const PictureLayerTilingSet* pending_twin_set) const {
 #if DCHECK_IS_ON()