[#4] Pass gfx structs by const ref (gfx::PointF)

cc/layers/texture_layer.cc

Index: cc/layers/texture_layer.cc
diff --git a/cc/layers/texture_layer.cc b/cc/layers/texture_layer.cc
index 195d05ddaba5721f1407a99a24912c69fecab392..a6387802b4279b631f1ed4907d61125067844410 100644
--- a/cc/layers/texture_layer.cc
+++ b/cc/layers/texture_layer.cc
@@ -69,7 +69,8 @@ void TextureLayer::SetFlipped(bool flipped) {
   SetNeedsCommit();
 }
 
-void TextureLayer::SetUV(gfx::PointF top_left, gfx::PointF bottom_right) {
+void TextureLayer::SetUV(const gfx::PointF& top_left,
+                         const gfx::PointF& bottom_right) {
   if (uv_top_left_ == top_left && uv_bottom_right_ == bottom_right)
     return;
   uv_top_left_ = top_left;