Enable the SSSE3 compile time check on all platforms.

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_GPU=<(skia_gpu)',
     'SK_SUPPORT_OPENCL=<(skia_opencl)',
     'SK_FORCE_DISTANCEFIELD_FONTS=<(skia_force_distancefield_fonts)',
   ],
   'conditions' : [
@@ skipping 628 matching lines @@
         },
         'libraries': [
           '-lstdc++',
           '-lm',
           '-llog',
         ],
         'cflags': [
           '-fuse-ld=gold',
         ],
         'conditions': [
+          [ 'skia_arch_type == "x86"', {
+            'cflags': [
+              '-mssse3',
+            ],
+          }],
           [ 'skia_android_framework', {
             'libraries!': [
               '-lstdc++',
               '-lm',
             ],
             'cflags!': [
               '-fuse-ld=gold',
             ],
           }],
           [ 'skia_shared_lib', {
@@ skipping 28 matching lines @@
     [ 'skia_crash_handler', {
       'defines': [ 'SK_CRASH_HANDLER' ],
     }],
 
   ], # end 'conditions'
   # The Xcode SYMROOT must be at the root. See build/common.gypi in chromium for more details
   'xcode_settings': {
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }