Add gyp define for optimization level

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 58 matching lines @@
               'VCLinkerTool': {
                 'GenerateDebugInformation': 'true', # /DEBUG
                 'LinkIncremental': '2',             # /INCREMENTAL
               },
             },
           },
           'Release': {
             'msvs_settings': {
               'VCCLCompilerTool': {
                 'DebugInformationFormat': '3',      # programDatabase (/Zi)
-                'Optimization': '3',                # full (/Ox)
+                'Optimization': '<(skia_release_optimization_level)',
                 '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)
                 'EnableEnhancedInstructionSet': '2',# /arch:SSE2
                 'RuntimeTypeInfo': 'false',         # /GR-
               },
               'VCLinkerTool': {
@@ skipping 40 matching lines @@
       {
         'defines': [
           'SK_SAMPLES_FOR_X',
           'SK_BUILD_FOR_UNIX',
         ],
         'configurations': {
           'Debug': {
             'cflags': ['-g']
           },
           'Release': {
-            'cflags': ['-O3 -g'],
+            'cflags': [
+              '-O<(skia_release_optimization_level)',
+              '-g',
+            ],
             'defines': [ 'NDEBUG' ],
           },
         },
         'cflags': [
           '-Wall',
           '-Wextra',
           # suppressions below here were added for clang
           '-Wno-unused-parameter',
           '-Wno-c++11-extensions'
         ],
@@ skipping 77 matching lines @@
           }],
         ],
         'configurations': {
           'Debug': {
             'xcode_settings': {
               'GCC_OPTIMIZATION_LEVEL': '0',
             },
           },
           'Release': {
             'xcode_settings': {
-              'GCC_OPTIMIZATION_LEVEL': '3',
+              'GCC_OPTIMIZATION_LEVEL': '<(skia_release_optimization_level)',
             },
             'defines': [ 'NDEBUG' ],
           },
         },
         'xcode_settings': {
           'GCC_SYMBOLS_PRIVATE_EXTERN': 'NO',
           'conditions': [
             [ 'skia_osx_sdkroot==""', {
               'SDKROOT': 'macosx<(mac_sdk)',  # -isysroot
             }, {
@@ skipping 45 matching lines @@
           }],
         ],
         'configurations': {
           'Debug': {
             'xcode_settings': {
               'GCC_OPTIMIZATION_LEVEL': '0',
             },
           },
           'Release': {
             'xcode_settings': {
-              'GCC_OPTIMIZATION_LEVEL': '3',
+              'GCC_OPTIMIZATION_LEVEL': '<(skia_release_optimization_level)',
             },
             'defines': [ 'NDEBUG' ],
           },
         },
         'xcode_settings': {
           'ARCHS': ['armv6', 'armv7'],
           'CODE_SIGNING_REQUIRED': 'NO',
           'CODE_SIGN_IDENTITY[sdk=iphoneos*]': '',
           'IPHONEOS_DEPLOYMENT_TARGET': '<(ios_sdk_version)',
           'SDKROOT': 'iphoneos',
@@ skipping 107 matching lines @@
   'xcode_settings': {
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }
 
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