Implements core logic for Pixel Canvas

cc/layers/recording_source.cc

Index: cc/layers/recording_source.cc
diff --git a/cc/layers/recording_source.cc b/cc/layers/recording_source.cc
index 0177d3517780db6dedf10f97048ee1390c44ef70..1fa1d7c02dc0d34e15d5de6349198bc93c4bfc7f 100644
--- a/cc/layers/recording_source.cc
+++ b/cc/layers/recording_source.cc
@@ -38,7 +38,8 @@ RecordingSource::RecordingSource()
       is_solid_color_(false),
       clear_canvas_with_debug_color_(kDefaultClearCanvasSetting),
       solid_color_(SK_ColorTRANSPARENT),
-      background_color_(SK_ColorTRANSPARENT) {}
+      background_color_(SK_ColorTRANSPARENT),
+      recording_scale_factor_(1.f) {}
 
 RecordingSource::~RecordingSource() {}
 
@@ -140,6 +141,10 @@ scoped_refptr<RasterSource> RecordingSource::CreateRasterSource() const {
   return scoped_refptr<RasterSource>(new RasterSource(this));
 }
 
+void RecordingSource::SetRecordingScaleFactor(float recording_scale_factor) {
+  recording_scale_factor_ = recording_scale_factor;
+}
+
 void RecordingSource::DetermineIfSolidColor() {
   DCHECK(display_list_);
   is_solid_color_ = false;