Disable GPU dithering in Android framework builds

gyp/skia_for_android_framework_defines.gypi

 # Copyright 2014 Google Inc.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This file is included by chrome's skia/skia_common.gypi, and is intended to
 # augment the skia flags that are set there.
 
 {
   'variables': {
 
@@ skipping 11 matching lines @@
       'SK_SUPPORT_LEGACY_GRADIENT_DITHERING',
       'SK_SUPPORT_LEGACY_DRAWFILTER',
       'SK_SUPPORT_LEGACY_CREATESHADER_PTR',
       'SK_SUPPORT_LEGACY_PATHEFFECT_PTR',
       'SK_SUPPORT_LEGACY_NEW_SURFACE_API',
       'SK_SUPPORT_LEGACY_PICTURE_PTR',
       'SK_SUPPORT_LEGACY_MASKFILTER_PTR',
       'SK_SUPPORT_LEGACY_IMAGEFACTORY',
       'SK_SUPPORT_LEGACY_XFERMODE_PTR',
       'SK_SUPPORT_LEGACY_TYPEFACE_PTR',
+      'SK_IGNORE_GPU_DITHER',
     ],
   },
 }