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 3785c1bbc2359c5bd590609db370a7a426baacfe..8a51b08ee06cb32b0b0f0a0decfe9f51c0cd1299 100644
--- a/ui/compositor/paint_recorder.h
+++ b/ui/compositor/paint_recorder.h
@@ -20,6 +20,7 @@ class Canvas;
 namespace ui {
 class PaintCache;
 class PaintContext;
+class PaintInfo;
 
 // A class to hide the complexity behind setting up a recording into a
 // DisplayItem. This is meant to be short-lived within the scope of recording
@@ -29,9 +30,9 @@ class COMPOSITOR_EXPORT PaintRecorder {
  public:
   // The |cache| is owned by the caller and must be kept alive while
   // PaintRecorder is in use. Canvas is bounded by |recording_size|.
-  PaintRecorder(const PaintContext& context,
-                const gfx::Size& recording_size,
-                PaintCache* cache);
+  // TODO(malaykeshav): |recording_size| is now redundant and can be removed
+  // since context already has size information.
+  PaintRecorder(const PaintInfo& info, PaintCache* cache);
   PaintRecorder(const PaintContext& context, const gfx::Size& recording_size);
   ~PaintRecorder();
 
@@ -44,6 +45,7 @@ class COMPOSITOR_EXPORT PaintRecorder {
   gfx::Canvas canvas_;
   PaintCache* cache_;
   gfx::Size recording_size_;
+  bool is_pixel_canvas_;
 
   DISALLOW_COPY_AND_ASSIGN(PaintRecorder);
 };