Adds the UserInputMonitor implementation for Mac.

media/media.gyp

Index: media/media.gyp
diff --git a/media/media.gyp b/media/media.gyp
index 800126b3a02cfeb8339a24e9a3960afc4ca9a188..794c83dc8246a81c083eb8a69cfb61f4e56e6dbe 100644
--- a/media/media.gyp
+++ b/media/media.gyp
@@ -785,6 +785,20 @@
           ],
         }],
         ['OS=="mac"', {
+          'sources': [

[DaleCurtis, 2013/08/19 23:49:00]

Seems like there should be a .gyp for the GTM project that media can add a a
dependency on instead of this manual source inclusion?

[jiayl, 2013/08/20 00:21:15]

But third_party/GTM has no .gyp file. Where to put it?

+            '../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',