Implements core logic for Pixel Canvas

cc/layers/picture_layer.cc

Index: cc/layers/picture_layer.cc
diff --git a/cc/layers/picture_layer.cc b/cc/layers/picture_layer.cc
index fd889200ca9717ae156020d07e3837b22abcb5a3..a58bcd77ff8dd861589f9385bb545682d6ab5fef 100644
--- a/cc/layers/picture_layer.cc
+++ b/cc/layers/picture_layer.cc
@@ -130,6 +130,9 @@ bool PictureLayer::Update() {
     recording_source_->UpdateDisplayItemList(
         picture_layer_inputs_.display_list,
         picture_layer_inputs_.painter_reported_memory_usage);
+    recording_source_->SetRecordingScaleFactor(
+        layer_tree_host()->recording_scale_factor());
+
     SetNeedsPushProperties();
   } else {
     // If this invalidation did not affect the recording source, then it can be