Workaround for Mac video flickering

ui/gl/yuv_to_rgb_converter.cc

 // 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.
 
 #include "ui/gl/yuv_to_rgb_converter.h"
 
 #include "base/strings/stringize_macros.h"
 #include "base/strings/stringprintf.h"
 #include "ui/gl/gl_helper.h"
 #include "ui/gl/gl_implementation.h"
@@ skipping 82 matching lines @@
   program_ = gfx::GLHelper::SetupProgram(vertex_shader_, fragment_shader_);
 
   gfx::ScopedUseProgram use_program(program_);
   size_location_ = glGetUniformLocation(program_, "a_texScale");
   DCHECK_NE(-1, size_location_);
   int y_sampler_location = glGetUniformLocation(program_, "a_y_texture");
   DCHECK_NE(-1, y_sampler_location);
   int uv_sampler_location = glGetUniformLocation(program_, "a_uv_texture");
   DCHECK_NE(-1, uv_sampler_location);
 
+  glGenTextures(1, &y_texture_);
+  glGenTextures(1, &uv_texture_);
+
   glUniform1i(y_sampler_location, 0);
   glUniform1i(uv_sampler_location, 1);
 }
 
 YUVToRGBConverter::~YUVToRGBConverter() {
   gfx::ScopedSetGLToRealGLApi scoped_set_gl_api;
+  glDeleteTextures(1, &y_texture_);
+  glDeleteTextures(1, &uv_texture_);
   glDeleteProgram(program_);
   glDeleteShader(vertex_shader_);
   glDeleteShader(fragment_shader_);
   glDeleteBuffersARB(1, &vertex_buffer_);
   glDeleteFramebuffersEXT(1, &framebuffer_);
 }
 
 void YUVToRGBConverter::CopyYUV420ToRGB(unsigned target,
                                         unsigned y_texture,
                                         unsigned uv_texture,
@@ skipping 38 matching lines @@
   glFramebufferTexture2DEXT(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
                             GL_TEXTURE_RECTANGLE_ARB, 0, 0);
   glActiveTexture(GL_TEXTURE0);
   glBindTexture(GL_TEXTURE_RECTANGLE_ARB, old_texture0_binding);
   glActiveTexture(GL_TEXTURE1);
   glBindTexture(GL_TEXTURE_RECTANGLE_ARB, old_texture1_binding);
   glActiveTexture(old_active_texture);
 }
 
 }  // namespace gl