Added AVFoundation Glue and Device Monitoring for Mac.

content/browser/device_monitor_mac.h

Index: content/browser/device_monitor_mac.h
diff --git a/content/browser/device_monitor_mac.h b/content/browser/device_monitor_mac.h
index bab522f4dbe5b5930e57fcacae1df370aaf03857..3646f9dd6ba588217d52a17a4f27aa2b3cbdee60 100644
--- a/content/browser/device_monitor_mac.h
+++ b/content/browser/device_monitor_mac.h
@@ -8,6 +8,10 @@
 #include "base/basictypes.h"
 #include "base/system_monitor/system_monitor.h"
 
+namespace {
+class MacMonitorInterface;
+}
+
 namespace content {
 
 class DeviceMonitorMac {
@@ -15,12 +19,13 @@ class DeviceMonitorMac {
   DeviceMonitorMac();
   ~DeviceMonitorMac();
 
- private:
-  // Forward the notifications to system monitor.
   void NotifyDeviceChanged(base::SystemMonitor::DeviceType type);
 
-  class QTMonitorImpl;
-  scoped_ptr<DeviceMonitorMac::QTMonitorImpl> qt_monitor_;
+  // Mutual exclusion lock for MacMonitorInterface::OnDeviceChanged().
+  base::Lock lock_;
+ private:
+  scoped_ptr<MacMonitorInterface> device_monitor_impl_;
+
   DISALLOW_COPY_AND_ASSIGN(DeviceMonitorMac);
 };