cc: Add checker-imaging support to TileManager.

cc/trees/layer_tree_impl.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/trees/layer_tree_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 300 matching lines @@
 }
 
 void LayerTreeImpl::BuildLayerListForTesting() {
   ClearLayerList();
   LayerListIterator<LayerImpl> it(root_layer_for_testing_);
   for (; it != LayerListIterator<LayerImpl>(nullptr); ++it) {
     AddToLayerList(*it);
   }
 }
 
+void LayerTreeImpl::InvalidateRegionForImages(
+    const std::unordered_set<uint32_t>& images_to_invalidate) {
+  DCHECK(IsSyncTree());
+  for (auto* picture_layer : picture_layers_) {

[vmpstr, 2017/02/10 19:25:43]

nit: don't need braces. I know it all seems very arbitrary, but *shrug* :)

[Khushal, 2017/02/10 22:09:19]

I think I'm understanding how this works now. :P

+    picture_layer->InvalidateRegionForImages(images_to_invalidate);
+  }
+}
+
 bool LayerTreeImpl::IsRootLayer(const LayerImpl* layer) const {
   return layer_list_.empty() ? false : layer_list_[0] == layer;
 }
 
 LayerImpl* LayerTreeImpl::InnerViewportScrollLayer() const {
   return LayerById(inner_viewport_scroll_layer_id_);
 }
 
 LayerImpl* LayerTreeImpl::OuterViewportScrollLayer() const {
   return LayerById(outer_viewport_scroll_layer_id_);
@@ skipping 1762 matching lines @@
 
 void LayerTreeImpl::ResetAllChangeTracking() {
   layers_that_should_push_properties_.clear();
   // Iterate over all layers, including masks.
   for (auto& layer : *layers_)
     layer->ResetChangeTracking();
   property_trees_.ResetAllChangeTracking();
 }
 
 }  // namespace cc