Workaround for Mac video flickering

ui/gl/yuv_to_rgb_converter.cc

Index: ui/gl/yuv_to_rgb_converter.cc
diff --git a/ui/gl/yuv_to_rgb_converter.cc b/ui/gl/yuv_to_rgb_converter.cc
index 4c19b3685d0ceb1396c3c49b0f5b067f2bf26571..11cba8cf24e7de31af9f5ab86668b284d0c83b48 100644
--- a/ui/gl/yuv_to_rgb_converter.cc
+++ b/ui/gl/yuv_to_rgb_converter.cc
@@ -100,12 +100,17 @@ YUVToRGBConverter::YUVToRGBConverter() {
   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_);