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

cc/quads/tile_draw_quad.h

Index: cc/quads/tile_draw_quad.h
diff --git a/cc/quads/tile_draw_quad.h b/cc/quads/tile_draw_quad.h
index 6da1e54a95216d93f5230a7a230645d503f3ac75..f4053c5be8ab37b9bc3c37b9d90056f0611544b1 100644
--- a/cc/quads/tile_draw_quad.h
+++ b/cc/quads/tile_draw_quad.h
@@ -15,17 +15,17 @@ class CC_EXPORT TileDrawQuad : public ContentDrawQuadBase {
   virtual ~TileDrawQuad();
 
   void SetNew(const SharedQuadState* shared_quad_state,
-              gfx::Rect rect,
-              gfx::Rect opaque_rect,
+              const gfx::Rect& rect,
+              const gfx::Rect& opaque_rect,
               unsigned resource_id,
               const gfx::RectF& tex_coord_rect,
               gfx::Size texture_size,
               bool swizzle_contents);
 
   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,
               unsigned resource_id,
               const gfx::RectF& tex_coord_rect,