[Win, MediaGallery] Enumerate and handle mtp device attach/detach events.

chrome/browser/chrome_browser_main_win.cc

Index: chrome/browser/chrome_browser_main_win.cc
diff --git a/chrome/browser/chrome_browser_main_win.cc b/chrome/browser/chrome_browser_main_win.cc
index 3373a469e2a0cb06f03d1cf9e4b583fc762cd6c0..0227ae9231428c48b827696ec7c20a688cd20425 100644
--- a/chrome/browser/chrome_browser_main_win.cc
+++ b/chrome/browser/chrome_browser_main_win.cc
@@ -27,6 +27,7 @@
 #include "chrome/browser/profiles/profile_info_cache.h"
 #include "chrome/browser/profiles/profile_shortcut_manager.h"
 #include "chrome/browser/shell_integration.h"
+#include "chrome/browser/system_monitor/media_transfer_protocol_device_observer_win.h"
 #include "chrome/browser/system_monitor/removable_device_notifications_window_win.h"
 #include "chrome/browser/ui/simple_message_box.h"
 #include "chrome/browser/ui/uninstall_browser_prompt.h"
@@ -200,6 +201,8 @@ void ChromeBrowserMainPartsWin::PreMainMessageLoopStart() {
     // Make sure that we know how to handle exceptions from the message loop.
     InitializeWindowProcExceptions();
   }
+  media_transfer_protocol_device_observer_ =
+      new chrome::mtp::MediaTransferProtocolDeviceObserverWin();
   removable_device_notifications_window_ =
       new chrome::RemovableDeviceNotificationsWindowWin();
 }
@@ -223,6 +226,7 @@ void ChromeBrowserMainPartsWin::PreMainMessageLoopRun() {
   ChromeBrowserMainParts::PreMainMessageLoopRun();
 
   removable_device_notifications_window_->Init();
+  media_transfer_protocol_device_observer_->Init();
 #if defined(USE_AURA)
   metro_viewer_process_host_.reset(new MetroViewerProcessHost);
 #endif