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

cc/quads/picture_draw_quad.h

Index: cc/quads/picture_draw_quad.h
diff --git a/cc/quads/picture_draw_quad.h b/cc/quads/picture_draw_quad.h
index 9bea70b4609959cbbc2a7b092e57c67c6048d965..8f7235315c029bb648b728bfec713e9b1586013c 100644
--- a/cc/quads/picture_draw_quad.h
+++ b/cc/quads/picture_draw_quad.h
@@ -23,24 +23,24 @@ class CC_EXPORT PictureDrawQuad : public ContentDrawQuadBase {
   virtual ~PictureDrawQuad();
 
   void SetNew(const SharedQuadState* shared_quad_state,
-              gfx::Rect rect,
-              gfx::Rect opaque_rect,
+              const gfx::Rect& rect,
+              const gfx::Rect& opaque_rect,
               const gfx::RectF& tex_coord_rect,
               gfx::Size texture_size,
               ResourceFormat texture_format,
-              gfx::Rect content_rect,
+              const gfx::Rect& content_rect,
               float contents_scale,
               scoped_refptr<PicturePileImpl> picture_pile);
 
   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,
               const gfx::RectF& tex_coord_rect,
               gfx::Size texture_size,
               ResourceFormat texture_format,
-              gfx::Rect content_rect,
+              const gfx::Rect& content_rect,
               float contents_scale,
               scoped_refptr<PicturePileImpl> picture_pile);