Dirty rects always contain full tiles with delegated rendering.

cc/test/fake_content_layer.cc

Index: cc/test/fake_content_layer.cc
diff --git a/cc/test/fake_content_layer.cc b/cc/test/fake_content_layer.cc
index 56a52cc10c7dd24a51163dc6f9b30586ef6bca30..e5ece64de50db152ba49b778734ee7afc2fd1041 100644
--- a/cc/test/fake_content_layer.cc
+++ b/cc/test/fake_content_layer.cc
@@ -9,6 +9,10 @@
 
 namespace cc {
 
+gfx::Rect FakeContentLayerUpdater::content_rect() const {
+  return ContentLayerUpdater::content_rect();
+}
+
 FakeContentLayer::FakeContentLayer(ContentLayerClient* client)
     : ContentLayer(client),
       update_count_(0),
@@ -27,6 +31,10 @@ scoped_ptr<LayerImpl> FakeContentLayer::CreateLayerImpl(
   return FakeContentLayerImpl::Create(tree_impl, layer_id_).PassAs<LayerImpl>();
 }
 
+FakeContentLayerUpdater *FakeContentLayer::Updater() const {
+  return (reinterpret_cast<FakeContentLayerUpdater*>(ContentLayer::Updater()));

[danakj, 2013/12/02 15:06:52]

this should be a static_cast, no?

+}
+
 bool FakeContentLayer::Update(ResourceUpdateQueue* queue,
                               const OcclusionTracker* occlusion) {
   bool updated = ContentLayer::Update(queue, occlusion);