Implements core logic for Pixel Canvas

ui/gfx/canvas.h

Index: ui/gfx/canvas.h
diff --git a/ui/gfx/canvas.h b/ui/gfx/canvas.h
index a70ce25fa080e57f1a6efbfafb0162c638e6544a..15248b32304af3d2b06996a8d7b5457e0c3895a0 100644
--- a/ui/gfx/canvas.h
+++ b/ui/gfx/canvas.h
@@ -191,7 +191,7 @@ class GFX_EXPORT Canvas {
 
   void Translate(const Vector2d& offset);
 
-  void Scale(int x_scale, int y_scale);
+  void Scale(float x_scale, float y_scale);

[oshima, 2017/06/15 22:59:13]

Can you land this fix separately?

[malaykeshav, 2017/06/16 20:41:58]

This is required only for Pixel canvas to scale with fractional values. I think
it should go along with this change.

[oshima, 2017/06/17 00:55:45]

I mean this isn't just a bug that we need to fix anyway?

 
   // Fills the entire canvas' bitmap (restricted to current clip) with
   // specified |color| using a transfer mode of SkBlendMode::kSrcOver.