Implement YUVVideoDrawQuad StructTraits

cc/quads/yuv_video_draw_quad.h

Index: cc/quads/yuv_video_draw_quad.h
diff --git a/cc/quads/yuv_video_draw_quad.h b/cc/quads/yuv_video_draw_quad.h
index 1f53e8df877e3945baa228e9d49446accbcd82c3..d0581e824032144ffb1075e31e3e44ce2a99a698 100644
--- a/cc/quads/yuv_video_draw_quad.h
+++ b/cc/quads/yuv_video_draw_quad.h
@@ -18,6 +18,11 @@ namespace cc {
 
 class CC_EXPORT YUVVideoDrawQuad : public DrawQuad {
  public:
+  static const size_t kYPlaneResourceIdIndex = 0;
+  static const size_t kUPlaneResourceIdIndex = 1;
+  static const size_t kVPlaneResourceIdIndex = 2;
+  static const size_t kAPlaneResourceIdIndex = 3;
+
   enum ColorSpace {
     REC_601,  // SDTV standard with restricted "studio swing" color range.
     REC_709,  // HDTV standard with restricted "studio swing" color range.
@@ -93,11 +98,6 @@ class CC_EXPORT YUVVideoDrawQuad : public DrawQuad {
   }
 
  private:
-  static const size_t kYPlaneResourceIdIndex = 0;
-  static const size_t kUPlaneResourceIdIndex = 1;
-  static const size_t kVPlaneResourceIdIndex = 2;
-  static const size_t kAPlaneResourceIdIndex = 3;
-
   void ExtendValue(base::trace_event::TracedValue* value) const override;
 };