cc: Invalidate the full tiled layer when contents scale changes.

cc/layer_tree_host_unittest_animation.cc

Index: cc/layer_tree_host_unittest_animation.cc
diff --git a/cc/layer_tree_host_unittest_animation.cc b/cc/layer_tree_host_unittest_animation.cc
index 384fbb3d4f8767f5a7fd1d457da85b7945686f9a..8900c93848c108c9864681cc7f6c47c2ae57518e 100644
--- a/cc/layer_tree_host_unittest_animation.cc
+++ b/cc/layer_tree_host_unittest_animation.cc
@@ -381,9 +381,9 @@ class LayerTreeHostAnimationTestDoNotSkipLayersWithAnimatedOpacity :
   }
 
   virtual void afterTest() OVERRIDE {
-    // update() should have been called once, proving that the layer was not
+    // update() should have been called, proving that the layer was not
     // skipped.
-    EXPECT_EQ(1, update_check_layer_->update_count());
+    EXPECT_NE(0, update_check_layer_->update_count());
 
     // clear update_check_layer_ so LayerTreeHost dies.
     update_check_layer_ = NULL;