Fix bad scaling in TiledLayer

cc/test/tiled_layer_test_common.cc

Index: cc/test/tiled_layer_test_common.cc
diff --git a/cc/test/tiled_layer_test_common.cc b/cc/test/tiled_layer_test_common.cc
index 3024cbd506a31638cbd52940c0bbf3e516af7b71..fc7abe46a4f70303dda9be764a98fe9853ed51ae 100644
--- a/cc/test/tiled_layer_test_common.cc
+++ b/cc/test/tiled_layer_test_common.cc
@@ -29,7 +29,9 @@ void FakeLayerUpdater::Resource::Update(ResourceUpdateQueue* queue,
   layer_->Update();
 }
 
-FakeLayerUpdater::FakeLayerUpdater() : prepare_count_(0), update_count_(0) {}
+FakeLayerUpdater::FakeLayerUpdater()
+    : prepare_count_(0), update_count_(0), last_contents_width_scale_(0.f) {
+}
 
 FakeLayerUpdater::~FakeLayerUpdater() {}
 
@@ -39,6 +41,7 @@ void FakeLayerUpdater::PrepareToUpdate(const gfx::Rect& content_rect,
                                        float contents_height_scale) {
   prepare_count_++;
   last_update_rect_ = content_rect;
+  last_contents_width_scale_ = contents_width_scale;
   if (!rect_to_invalidate_.IsEmpty()) {
     layer_->InvalidateContentRect(rect_to_invalidate_);
     rect_to_invalidate_ = gfx::Rect();