Adds the UserInputMonitor implementation for Mac.

media/media.gyp

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'variables': {
     'chromium_code': 1,
     # Override to dynamically link the cras (ChromeOS audio) library.
     'use_cras%': 0,
     # Option e.g. for Linux distributions to link pulseaudio directly
@@ skipping 767 matching lines @@
             'audio/pulse/pulse_util.h',
           ],
         }],
         ['os_posix==1', {
           'sources!': [
             'video/capture/video_capture_device_dummy.cc',
             'video/capture/video_capture_device_dummy.h',
           ],
         }],
         ['OS=="mac"', {
+          'sources': [
+            '../third_party/GTM/AppKit/GTMCarbonEvent.h',
+            '../third_party/GTM/AppKit/GTMCarbonEvent.m',
+            '../third_party/GTM/DebugUtils/GTMDebugSelectorValidation.h',
+            '../third_party/GTM/DebugUtils/GTMTypeCasting.h',
+            '../third_party/GTM/Foundation/GTMObjectSingleton.h',
+            '../third_party/GTM/GTMDefines.h',
+          ],
+          'include_dirs': [
+            '../third_party/GTM',
+            '../third_party/GTM/AppKit',
+            '../third_party/GTM/DebugUtils',
+            '../third_party/GTM/Foundation',
+          ],
           'link_settings': {
             'libraries': [
               '$(SDKROOT)/System/Library/Frameworks/AudioToolbox.framework',
               '$(SDKROOT)/System/Library/Frameworks/AudioUnit.framework',
               '$(SDKROOT)/System/Library/Frameworks/CoreAudio.framework',
               '$(SDKROOT)/System/Library/Frameworks/CoreMIDI.framework',
               '$(SDKROOT)/System/Library/Frameworks/CoreVideo.framework',
               '$(SDKROOT)/System/Library/Frameworks/OpenGL.framework',
               '$(SDKROOT)/System/Library/Frameworks/QTKit.framework',
             ],
@@ skipping 878 matching lines @@
           'sources': [
             'tools/media_bench/media_bench.cc',
           ],
           # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
           'msvs_disabled_warnings': [ 4267, ],
         },
       ],
     }],
   ],
 }