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

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 f4053c5be8ab37b9bc3c37b9d90056f0611544b1..75eb4d48b6d3e6f1aa22c4369384b1ea4f86c8f2 100644
--- a/cc/quads/tile_draw_quad.h
+++ b/cc/quads/tile_draw_quad.h
@@ -19,7 +19,7 @@ class CC_EXPORT TileDrawQuad : public ContentDrawQuadBase {
               const gfx::Rect& opaque_rect,
               unsigned resource_id,
               const gfx::RectF& tex_coord_rect,
-              gfx::Size texture_size,
+              const gfx::Size& texture_size,
               bool swizzle_contents);
 
   void SetAll(const SharedQuadState* shared_quad_state,
@@ -29,7 +29,7 @@ class CC_EXPORT TileDrawQuad : public ContentDrawQuadBase {
               bool needs_blending,
               unsigned resource_id,
               const gfx::RectF& tex_coord_rect,
-              gfx::Size texture_size,
+              const gfx::Size& texture_size,
               bool swizzle_contents);
 
   unsigned resource_id;