[#7] Resubmitted - Pass gfx structs by const ref (gfx::Size)

cc/quads/shared_quad_state.cc

Index: cc/quads/shared_quad_state.cc
diff --git a/cc/quads/shared_quad_state.cc b/cc/quads/shared_quad_state.cc
index 66d0607f45c3bc8e198d6d5deb5e631483351bc0..9ea3faa27dc21693733b954dd5958c745418b3b2 100644
--- a/cc/quads/shared_quad_state.cc
+++ b/cc/quads/shared_quad_state.cc
@@ -28,7 +28,7 @@ scoped_ptr<SharedQuadState> SharedQuadState::Copy() const {
 }
 
 void SharedQuadState::SetAll(const gfx::Transform& content_to_target_transform,
-                             gfx::Size content_bounds,
+                             const gfx::Size& content_bounds,
                              const gfx::Rect& visible_content_rect,
                              const gfx::Rect& clip_rect,
                              bool is_clipped,