Pass gfx structs by const ref(gfx::Vector2D/F)

cc/resources/texture_uploader.cc

Index: cc/resources/texture_uploader.cc
diff --git a/cc/resources/texture_uploader.cc b/cc/resources/texture_uploader.cc
index 601fa8fbff89de41c26075cf1be5d97dff61fdd3..89271bdcb541e3b0643b09b6dd117221a6cb24c7 100644
--- a/cc/resources/texture_uploader.cc
+++ b/cc/resources/texture_uploader.cc
@@ -136,7 +136,7 @@ void TextureUploader::EndQuery() {
 void TextureUploader::Upload(const uint8* image,
                              const gfx::Rect& image_rect,
                              const gfx::Rect& source_rect,
-                             gfx::Vector2d dest_offset,
+                             const gfx::Vector2d& dest_offset,
                              ResourceFormat format,
                              const gfx::Size& size) {
   CHECK(image_rect.Contains(source_rect));
@@ -173,7 +173,7 @@ void TextureUploader::ReleaseCachedQueries() {
 void TextureUploader::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) {
   TRACE_EVENT0("cc", "TextureUploader::UploadWithTexSubImage");
 
@@ -227,7 +227,7 @@ void TextureUploader::UploadWithTexSubImage(const uint8* image,
 void TextureUploader::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) {
   TRACE_EVENT0("cc", "TextureUploader::UploadWithMapTexSubImage");