[#6]Pass gfx structs by const ref (gfx::Vector2d)

cc/scheduler/texture_uploader.h

Index: cc/scheduler/texture_uploader.h
diff --git a/cc/scheduler/texture_uploader.h b/cc/scheduler/texture_uploader.h
index 362f00199da8244f550f629296de90f63cdf1108..342a74c7061390efdb4bb29da1720d182042acd8 100644
--- a/cc/scheduler/texture_uploader.h
+++ b/cc/scheduler/texture_uploader.h
@@ -45,7 +45,7 @@ class CC_EXPORT TextureUploader {
   void Upload(const uint8* image,
               const gfx::Rect& content_rect,
               const gfx::Rect& source_rect,
-              gfx::Vector2d dest_offset,
+              const gfx::Vector2d& dest_offset,
               ResourceFormat format,
               gfx::Size size);
 
@@ -94,12 +94,12 @@ class CC_EXPORT TextureUploader {
   void UploadWithTexSubImage(const uint8* image,
                              const gfx::Rect& image_rect,
                              const gfx::Rect& source_rect,
-                             gfx::Vector2d dest_offset,
+                             const gfx::Vector2d& dest_offset,
                              ResourceFormat format);
   void UploadWithMapTexSubImage(const uint8* image,
                                 const gfx::Rect& image_rect,
                                 const gfx::Rect& source_rect,
-                                gfx::Vector2d dest_offset,
+                                const gfx::Vector2d& dest_offset,
                                 ResourceFormat format);
   void UploadWithTexImageETC1(const uint8* image, gfx::Size size);