Try to roll angle again.

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 15 matching lines @@
       {
         'defines': [
           'SK_BUILD_FOR_WIN32',
           '_CRT_SECURE_NO_WARNINGS',
           'GR_GL_FUNCTION_TYPE=__stdcall',
         ],
         'msvs_disabled_warnings': [
             4345,  # This is an FYI about a behavior change from long ago.  Chrome stifles it too.
         ],
         'msvs_cygwin_shell': 0,
+        'msvs_disabled_warnings': [4275],
         'msvs_settings': {
           'VCCLCompilerTool': {
             'WarningLevel': '3',
             'ProgramDataBaseFileName': '$(OutDir)\\$(ProjectName).pdb',
             'DebugInformationFormat': '3',
             'ExceptionHandling': '0',
             'AdditionalOptions': [ '/MP', ],
           },
           'VCLinkerTool': {
             'LargeAddressAware': 2,  # 2 means "Yes, please let me use more RAM on 32-bit builds."
@@ skipping 638 matching lines @@
         'SK_BUILD_JSON_WRITER',
       ]
     }],
 
   ], # end 'conditions'
   # The Xcode SYMROOT must be at the root. See build/common.gypi in chromium for more details
   'xcode_settings': {
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }