enable colorfilter optimization (big speedup for sites with shadows)

Review URL: http://codereview.chromium.org/8590035

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@110543 0039d316-1c4b-4281-b951-d872f2087c98

skia/skia.gyp

@@ -729,7 +729,7 @@
         'GR_STATIC_RECT_VB=1',
         'GR_AGGRESSIVE_SHADER_OPTS=1',
         'SK_DISABLE_FAST_AA_STROKE_RECT',
-        'SK_IGNORE_CF_OPTIMIZATION',
+#        'SK_ENABLE_FAST_SHADERMASK',
         'SK_DEFAULT_FONT_CACHE_LIMIT=(16*1024*1024)',
       ],
       'sources!': [