Implements core logic for Pixel Canvas

ui/compositor/paint_recorder.h

Index: ui/compositor/paint_recorder.h
diff --git a/ui/compositor/paint_recorder.h b/ui/compositor/paint_recorder.h
index ffe090a23c210fac6d9c201c1c1100e769bd14d8..609d6f0bf4251aeac5e7d71fce31ef20f145bb35 100644
--- a/ui/compositor/paint_recorder.h
+++ b/ui/compositor/paint_recorder.h
@@ -32,6 +32,8 @@ class COMPOSITOR_EXPORT PaintRecorder {
   // PaintRecorder is in use. Canvas is bounded by |recording_size|.
   PaintRecorder(const PaintContext& context,
                 const gfx::Size& recording_size,
+                float recording_scale_x,
+                float recording_scale_y,
                 PaintCache* cache);
   PaintRecorder(const PaintContext& context, const gfx::Size& recording_size);
   ~PaintRecorder();