Implements core logic for Pixel Canvas

ui/compositor/compositor.h

Index: ui/compositor/compositor.h
diff --git a/ui/compositor/compositor.h b/ui/compositor/compositor.h
index 94fcfc9c1a5cb0937d108970fdfd9ba41c71aa11..4a75353185be556236642fc8bb8daf5f83827cde 100644
--- a/ui/compositor/compositor.h
+++ b/ui/compositor/compositor.h
@@ -188,7 +188,8 @@ class COMPOSITOR_EXPORT Compositor
              ui::ContextFactory* context_factory,
              ui::ContextFactoryPrivate* context_factory_private,
              scoped_refptr<base::SingleThreadTaskRunner> task_runner,
-             bool enable_surface_synchronization);
+             bool enable_surface_synchronization,
+             bool enable_pixel_canvas = false);

[danakj, 2017/07/25 17:58:56]

Can you avoid default parameter values?

[malaykeshav, 2017/07/25 22:57:57]

Done

   ~Compositor() override;
 
   ui::ContextFactory* context_factory() { return context_factory_; }
@@ -375,6 +376,8 @@ class COMPOSITOR_EXPORT Compositor
     allow_locks_to_extend_timeout_ = allowed;
   }
 
+  bool is_pixel_canvas() const { return is_pixel_canvas_; }
+
  private:
   friend class base::RefCounted<Compositor>;
 
@@ -435,6 +438,8 @@ class COMPOSITOR_EXPORT Compositor
   base::TimeTicks scheduled_timeout_;
   // If true, the |scheduled_timeout_| might be recalculated and extended.
   bool allow_locks_to_extend_timeout_;
+  // If true, all paint commands are recorded at pixel size instead of DIP.

[danakj, 2017/07/25 17:58:56]

Can you also comment on the accessor method?

[malaykeshav, 2017/07/25 22:57:57]

Done

+  bool is_pixel_canvas_;

[danakj, 2017/07/25 17:58:56]

const

[malaykeshav, 2017/07/25 22:57:57]

Done

 
   base::WeakPtrFactory<Compositor> weak_ptr_factory_;
   base::WeakPtrFactory<Compositor> lock_timeout_weak_ptr_factory_;