libwebp: use -O2 on arm targets

third_party/libwebp/libwebp.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.
 
 {
+  'target_defaults': {
+    'conditions': [
+      ['os_posix==1 and (target_arch=="arm" or target_arch=="arm64")', {
+        'cflags!': [ '-Os' ],
+        'cflags': [ '-O2' ],
+      }],
+    ],
+  },
   'targets': [
     {
       'target_name': 'libwebp_dec',
       'type': 'static_library',
       'dependencies' : [
         'libwebp_dsp',
         'libwebp_dsp_neon',
         'libwebp_utils',
       ],
       'include_dirs': ['.'],
@@ skipping 265 matching lines @@
       ],
       'direct_dependent_settings': {
         'include_dirs': ['.'],
       },
       'conditions': [
         ['OS!="win"', {'product_name': 'webp'}],
       ],
     },
   ],
 }