MacViews: draw combobox arrow backgrounds

ui/gfx/canvas.h

Index: ui/gfx/canvas.h
diff --git a/ui/gfx/canvas.h b/ui/gfx/canvas.h
index 367aa8a74416facf0b0c0062944121ffd17dee06..99ca4339e26b212e243a5b674bd214cd9ea0df43 100644
--- a/ui/gfx/canvas.h
+++ b/ui/gfx/canvas.h
@@ -74,6 +74,21 @@ class GFX_EXPORT Canvas {
     NO_SUBPIXEL_RENDERING = 1 << 9,
   };
 
+  // This class represents a scoped state of a Canvas. When a ScopedState is

[tapted, 2016/03/21 07:09:04]

ui/gfx/scoped_canvas.h?

[Elly Fong-Jones, 2016/03/21 18:53:56]

Ach! The idiom I'm used to is having these Scoped* classes as inner classes of
the thing they're scoping, instead of separate classes. Oops :) Deleted this.

+  // constructed, it saves the state of the supplied Canvas; when a ScopedState
+  // is destroyed, it restores the state it saved earlier.
+  class ScopedState {
+   public:
+    ScopedState(Canvas* canvas) : canvas_(canvas) {
+      canvas_->Save();
+    }
+    ~ScopedState() {
+      canvas_->Restore();
+    }
+   private:
+    Canvas* canvas_;
+  };
+
   // Creates an empty canvas with image_scale of 1x.
   Canvas();