Roll Skia DEPS to r7572 & add some suppressions

skia/skia.gyp

 # Copyright (c) 2012 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.
 
 {
   'targets': [
     {
       'target_name': 'skia',
       'type': '<(component)',
       'variables': {
@@ skipping 214 matching lines @@
         # of its "pictures" library. This is currently not used in chrome; if
         # it ever gets used the processes that use it need to call
         # SkGraphics::Init().
         'SK_ALLOW_STATIC_GLOBAL_INITIALIZERS=0',
 
         'SK_IGNORE_1XN_BITMAP_OPT',
         'SK_IGNORE_CLIP_BUG_FIX',
         'SK_IGNORE_CONVEX_QUAD_OPT',
         'SK_IGNORE_SETLINE_FIX',
 
+        'SK_IGNORE_GRADIENT_DITHER_FIX',
+
         # Disable this check because it is too strict for some Chromium-specific
         # subclasses of SkPixelRef. See bug: crbug.com/171776.
         'SK_DISABLE_PIXELREF_LOCKCOUNT_BALANCE_CHECK',
       ],
       'sources!': [
         '../third_party/skia/include/core/SkTypes.h',
       ],
       'conditions': [
         ['skia_support_gpu != 0', {
           'includes': [
@@ skipping 591 matching lines @@
           'sources': [
             '../third_party/skia/src/opts/SkBitmapProcState_opts_none.cpp',
             '../third_party/skia/src/opts/SkBlitRow_opts_none.cpp',
             '../third_party/skia/src/opts/SkUtils_opts_none.cpp',
           ],
         },
       ],
     }],
   ],
 }