Add skia_exceptinos gyp define

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 95 matching lines @@
           [ 'skia_warnings_as_errors', {
             'msvs_settings': {
               'VCCLCompilerTool': {
                 'WarnAsError': 'true',
                 'AdditionalOptions': [
                   '/we4189', # initialized but unused var warning
                 ],
               },
             },
           }],
+          [ 'skia_win_exceptions', {
+            'msvs_settings': {
+              'VCCLCompilerTool': {
+                'AdditionalOptions': [
+                  '/EHsc',
+                ],
+              },
+            },
+          }],
         ],
       },
     ],
 
     [ 'skia_os in ["linux", "freebsd", "openbsd", "solaris", "nacl", "chromeos"]',
       {
         'defines': [
           'SK_SAMPLES_FOR_X',
           'SK_BUILD_FOR_UNIX',
         ],
@@ skipping 288 matching lines @@
   'xcode_settings': {
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }
 
 # Local Variables:
 # tab-width:2
 # indent-tabs-mode:nil
 # End:
 # vim: set expandtab tabstop=2 shiftwidth=2: