Better document ES3 MSAA driver bug workaround for Qualcomm GPUs.

gpu/config/gpu_driver_bug_list_json.cc

 // Copyright (c) 2013 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.
 
 // Determines whether a certain driver bug exists in the current system.
 // The format of a valid gpu_driver_bug_list.json file is defined in
 // <gpu/config/gpu_control_list_format.txt>.
 // The supported "features" can be found in
 // <gpu/config/gpu_driver_bug_workaround_type.h>.
 
@@ skipping 401 matching lines @@
       "os": {
         "type": "win"
       },
       "gl_renderer": "ANGLE.*",
       "features": [
         "texsubimage_faster_than_teximage"
       ]
     },
     {
       "id": 52,
+      "cr_bugs": [449116, 471200, 612474],
       "description": "ES3 MSAA is broken on Qualcomm",
       "os": {
         "type": "android"
       },
       "gl_vendor": "Qualcomm.*",
       "features": [
         "disable_chromium_framebuffer_multisample"
       ]
     },
     {
@@ skipping 1738 matching lines @@
       ]
     }
   ]
   // Please update the version number at beginning of this file whenever you
   // change this file.
 }
 
 );  // LONG_STRING_CONST macro
 
 }  // namespace gpu