Pass ColorSpace by ref to YUVToRGBConverter ctor

Pass gfx::ColorSpace by reference to the YUVToRGBConverter constructor.

Change-Id: I1f704e0eff21fbee47ab27df6f3c557684303812
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2211937Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Wan-Teh Chang <wtc@google.com>
Cr-Commit-Position: refs/heads/master@{#771154}

ui/gl/yuv_to_rgb_converter.cc

@@ -119,7 +119,7 @@ STRINGIZE(
 }  // namespace
 
 YUVToRGBConverter::YUVToRGBConverter(const GLVersionInfo& gl_version_info,
-                                     const gfx::ColorSpace color_space) {
+                                     const gfx::ColorSpace& color_space) {
   std::unique_ptr<gfx::ColorTransform> color_transform =
       gfx::ColorTransform::NewColorTransform(
           color_space, color_space.GetAsFullRangeRGB(),

ui/gl/yuv_to_rgb_converter.h

@@ -18,7 +18,7 @@ struct GLVersionInfo;
 class YUVToRGBConverter {
  public:
   explicit YUVToRGBConverter(const GLVersionInfo& gl_version_info,
-                             const gfx::ColorSpace color_space);
+                             const gfx::ColorSpace& color_space);
   ~YUVToRGBConverter();
 
   // The input Y and UV textures should be bound to these texture objects