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

cc/quads/content_draw_quad_base.h

Index: cc/quads/content_draw_quad_base.h
diff --git a/cc/quads/content_draw_quad_base.h b/cc/quads/content_draw_quad_base.h
index cbf18ca2b157f5e933a49506ba7093f8441aa97f..d07bd368b17894d340d66a8b1fef51bb1ae616e8 100644
--- a/cc/quads/content_draw_quad_base.h
+++ b/cc/quads/content_draw_quad_base.h
@@ -18,17 +18,17 @@ class CC_EXPORT ContentDrawQuadBase : public DrawQuad {
  public:
   void SetNew(const SharedQuadState* shared_quad_state,
               DrawQuad::Material material,
-              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,
               bool swizzle_contents);
 
   void SetAll(const SharedQuadState* shared_quad_state,
               DrawQuad::Material material,
-              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,