Workaround for Mac video flickering

ui/gl/yuv_to_rgb_converter.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_GL_YUV420_RGB_CONVERTER_H_
 #define UI_GL_YUV420_RGB_CONVERTER_H_
 
 #include "ui/gfx/geometry/size.h"
 
 namespace gl {
 
 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);
 
  private:
   unsigned framebuffer_ = 0;
   unsigned vertex_shader_ = 0;
   unsigned fragment_shader_ = 0;
   unsigned program_ = 0;
   int size_location_ = -1;
   unsigned vertex_buffer_ = 0;
+  unsigned y_texture_ = 0;
+  unsigned uv_texture_ = 0;
 };
 
 }  // namespace gl
 
 #endif  // UI_GL_YUV420_RGB_CONVERTER_H_