[#2] Pass gfx structs by const ref (gfx::Rect, gfx::RectF)

cc/quads/debug_border_draw_quad.h

Index: cc/quads/debug_border_draw_quad.h
diff --git a/cc/quads/debug_border_draw_quad.h b/cc/quads/debug_border_draw_quad.h
index 5b369514b509ed7c3ed6ce787063e6d8ccf596f0..bcdaff982cbc1f19da76ee35038a28aecdc764d2 100644
--- a/cc/quads/debug_border_draw_quad.h
+++ b/cc/quads/debug_border_draw_quad.h
@@ -17,14 +17,14 @@ class CC_EXPORT DebugBorderDrawQuad : public DrawQuad {
   static scoped_ptr<DebugBorderDrawQuad> Create();
 
   void SetNew(const SharedQuadState* shared_quad_state,
-              gfx::Rect rect,
+              const gfx::Rect& rect,
               SkColor color,
               int width);
 
   void SetAll(const SharedQuadState* shared_quad_state,
-              gfx::Rect rect,
-              gfx::Rect opaque_rect,
-              gfx::Rect visible_rect,
+              const gfx::Rect& rect,
+              const gfx::Rect& opaque_rect,
+              const gfx::Rect& visible_rect,
               bool needs_blending,
               SkColor color,
               int width);