skia: Add ANGLE support on Mac

gyp/common_conditions.gypi

 # Copyright 2015 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # conditions used in both common.gypi and skia.gyp in chromium
 #
 {
   'defines': [
     'SK_ALLOW_STATIC_GLOBAL_INITIALIZERS=<(skia_static_initializers)',
@@ skipping 446 matching lines @@
           [ 'skia_keep_frame_pointer', {
             'cflags': [ '-fno-omit-frame-pointer' ],
           }],
         ],
       },
     ],
 
     [ 'skia_os == "mac"',
       {
         'defines': [ 'SK_BUILD_FOR_MAC' ],
+        'conditions': [
+            # ANGLE for mac hits -Wunneeded-internal-declaration if this isn't set.
+            [ 'skia_angle', { 'defines': [ 'YY_NO_INPUT' ], } ],
+        ],
         'configurations': {
           'Coverage': {
             'xcode_settings': {
                'GCC_OPTIMIZATION_LEVEL': '0',
                'GCC_GENERATE_TEST_COVERAGE_FILES': 'YES',
                'GCC_INSTRUMENT_PROGRAM_FLOW_ARCS' : 'YES',
             },
           },
           'Debug': {
             'xcode_settings': { 'GCC_OPTIMIZATION_LEVEL': '0' },
@@ skipping 151 matching lines @@
           'LD_RUNPATH_SEARCH_PATHS': ['@executable_path/.'],
       },
     }],
 
   ], # end 'conditions'
   # The Xcode SYMROOT must be at the root. See build/common.gypi in chromium for more details
   'xcode_settings': {
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }