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

cc/quads/picture_draw_quad.cc

Index: cc/quads/picture_draw_quad.cc
diff --git a/cc/quads/picture_draw_quad.cc b/cc/quads/picture_draw_quad.cc
index bdb12e64d7a75dda1f01fb4753a7bc2a82fa88ba..f51b65b5aa9a1260451fddfea4f1aafbdb99339a 100644
--- a/cc/quads/picture_draw_quad.cc
+++ b/cc/quads/picture_draw_quad.cc
@@ -21,12 +21,12 @@ scoped_ptr<PictureDrawQuad> PictureDrawQuad::Create() {
 }
 
 void PictureDrawQuad::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) {
   ContentDrawQuadBase::SetNew(shared_quad_state,
@@ -44,14 +44,14 @@ void PictureDrawQuad::SetNew(const SharedQuadState* shared_quad_state,
 }
 
 void PictureDrawQuad::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) {
   ContentDrawQuadBase::SetAll(shared_quad_state,