Add a flag to enable impl-thread event handling on Mac

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index 791cc70e29e8c30c901cfc3311baf34a3da15915..bb1d9263a96c25749a7343579f580d86bb2a9e61 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -938,9 +938,16 @@ const char kDisableVaapiAcceleratedVideoEncode[] =
 const char kEnableSpeechDispatcher[] = "enable-speech-dispatcher";
 #endif
 
+#if defined(OS_MACOSX)
+// Allows input events to be handed on the compositor thread.
+// This feature is under development, see http://crbug.com/138003.
+extern const char kEnableThreadedEventHandlingMac[] =
+    "enable-threaded-event-handling-mac";
+#endif
+

[Avi (use Gerrit), 2014/10/21 00:03:53]

Ditto.

[ccameron, 2014/10/21 00:14:46]

Done.

 #if defined(OS_MACOSX) && !defined(OS_IOS)
 // Disables support for Core Animation plugins. This is triggered when
-// accelerated compositing is disabled. See http://crbug.com/122430 .
+// accelerated compositing is disabled. See http://crbug.com/122430.
 const char kDisableCoreAnimationPlugins[] =
     "disable-core-animation-plugins";
 #endif