Workaround for Mac video flickering

ui/gl/yuv_to_rgb_converter.h

Index: ui/gl/yuv_to_rgb_converter.h
diff --git a/ui/gl/yuv_to_rgb_converter.h b/ui/gl/yuv_to_rgb_converter.h
index 794b61511a61b8001428780c22a765e26bbacd51..c1d5e97e0e84238fc1ec659062c00a3edce85bbd 100644
--- a/ui/gl/yuv_to_rgb_converter.h
+++ b/ui/gl/yuv_to_rgb_converter.h
@@ -13,9 +13,13 @@ class YUVToRGBConverter {
  public:
   YUVToRGBConverter();
   ~YUVToRGBConverter();
+
+  // The input Y and UV textures should be bound to these texture objects
+  // prior to calling CopyYUV420ToRGB.
+  unsigned y_texture() const { return y_texture_; }
+  unsigned uv_texture() const { return uv_texture_; }
+
   void CopyYUV420ToRGB(unsigned target,
-                       unsigned y_texture,
-                       unsigned uv_texture,
                        const gfx::Size& size,
                        unsigned rgb_texture);
 
@@ -26,6 +30,8 @@ class YUVToRGBConverter {
   unsigned program_ = 0;
   int size_location_ = -1;
   unsigned vertex_buffer_ = 0;
+  unsigned y_texture_ = 0;
+  unsigned uv_texture_ = 0;
 };
 
 }  // namespace gl