Enable init'ed but unused var warning on windows for closer parity with mac/linux warnings.

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 10 matching lines @@
       {
         'defines': [
           'SK_BUILD_FOR_WIN32',
           'SK_IGNORE_STDINT_DOT_H',
           '_CRT_SECURE_NO_WARNINGS',
           'GR_GL_FUNCTION_TYPE=__stdcall',
         ],
         'msvs_cygwin_shell': 0,
         'msvs_settings': {
           'VCCLCompilerTool': {
-            'WarningLevel': '1',
+            'WarningLevel': '3',
+            'ProgramDataBaseFileName': '$(OutDir)\\$(ProjectName).pdb',
             'DebugInformationFormat': '3',
-            'AdditionalOptions': [ '/MP' ],
+            'ExceptionHandling': '0',
+            'AdditionalOptions': [ '/MP', ],
           },
           'VCLinkerTool': {
             'AdditionalDependencies': [
               'OpenGL32.lib',
               'usp10.lib',
             ],
           },
         },
         'configurations': {
           'Debug': {
             'msvs_settings': {
               'VCCLCompilerTool': {
                 'DebugInformationFormat': '4', # editAndContiue (/ZI)
-                'ProgramDataBaseFileName': '$(OutDir)\\$(ProjectName).pdb',
                 'Optimization': '0',           # optimizeDisabled (/Od)
                 'PreprocessorDefinitions': ['_DEBUG'],
                 'RuntimeLibrary': '3',         # rtMultiThreadedDebugDLL (/MDd)
-                'ExceptionHandling': '0',
                 'RuntimeTypeInfo': 'false',      # /GR-
-                'WarningLevel': '3',             # level3 (/W3)
               },
               'VCLinkerTool': {
                 'GenerateDebugInformation': 'true', # /DEBUG
                 'LinkIncremental': '2',             # /INCREMENTAL
               },
             },
           },
           'Release': {
             'msvs_settings': {
               'VCCLCompilerTool': {
                 'DebugInformationFormat': '3',      # programDatabase (/Zi)
-                'ProgramDataBaseFileName': '$(OutDir)\\$(ProjectName).pdb',
                 'Optimization': '3',                # full (/Ox)
                 'WholeProgramOptimization': 'true', #/GL
                # Changing the floating point model requires rebaseling gm images
                #'FloatingPointModel': '2',          # fast (/fp:fast)
                 'FavorSizeOrSpeed': '1',            # speed (/Ot)
                 'PreprocessorDefinitions': ['NDEBUG'],
                 'RuntimeLibrary': '2',              # rtMultiThreadedDLL (/MD)
-                'ExceptionHandling': '0',
                 'EnableEnhancedInstructionSet': '2',# /arch:SSE2
                 'RuntimeTypeInfo': 'false',         # /GR-
-                'WarningLevel': '3',                # level3 (/W3)
               },
               'VCLinkerTool': {
                 'GenerateDebugInformation': 'true', # /DEBUG
                 'LinkTimeCodeGeneration': '1',      # useLinkTimeCodeGeneration /LTCG
               },
               'VCLibrarianTool': {
                 'LinkTimeCodeGeneration': 'true',   # useLinkTimeCodeGeneration /LTCG
               },
             },
           },
@@ skipping 21 matching lines @@
                 'msvs_settings': {
                   'VCCLCompilerTool': {
                     'WarnAsError': 'false',
                   },
                 },
               },{ # not angle
                 'msvs_configuration_platform': 'Win32',
                 'msvs_settings': {
                   'VCCLCompilerTool': {
                     'WarnAsError': 'true',
+                    'AdditionalOptions': [
+                      '/we4189', # initialized but unused var warning
+                    ],
                   },
                 },
               }],
             ],
           }],
         ],
       },
     ],
 
     ['skia_os in ["linux", "freebsd", "openbsd", "solaris", "nacl"]',
@@ skipping 255 matching lines @@
   'xcode_settings': {
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }
 
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