Revert Skia to use -02.

gyp/common_conditions.gypi

 # conditions used in both common.gypi and skia.gyp in chromium
 #
 {
   'defines': [
     'SK_ALLOW_STATIC_GLOBAL_INITIALIZERS=<(skia_static_initializers)',
 #    'SK_SUPPORT_HINTING_SCALE_FACTOR',
   ],
   'conditions' : [
     [ 'skia_gpu == 1',
       {
@@ skipping 281 matching lines @@
     [ 'skia_os == "android"',
       {
         'defines': [
           'SK_BUILD_FOR_ANDROID',
         ],
         'configurations': {
           'Debug': {
             'cflags': ['-g']
           },
           'Release': {
-            'cflags': ['-O3'],
+            'cflags': ['-O2'],
             'defines': [ 'NDEBUG' ],
           },
         },
         'libraries': [
           '-lstdc++',
           '-lm',
           '-llog',
         ],
         'cflags': [
           '-Wall',
@@ skipping 63 matching lines @@
   'xcode_settings': {
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }
 
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