Add the prototype for the function to display metro style notifications.

BUG=133109
R=robertshield
Review URL: https://chromiumcodereview.appspot.com/10823170

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@149962 0039d316-1c4b-4281-b951-d872f2087c98

base/win/metro.h

@@ -70,6 +70,15 @@ BASE_EXPORT bool IsParentalControlActivityLoggingOn();
 // Handler function for the buttons on a metro dialog box
 typedef void (*MetroDialogButtonPressedHandler)();
 
+// Function to display metro style notifications.
+typedef void (*MetroNotification)(const char* origin_url,
+                                  const char* icon_url,
+                                  const wchar_t* title,
+                                  const wchar_t* body,
+                                  const wchar_t* display_source,
+                                  const char* notification_id);
+
+
 }  // namespace win
 }  // namespace base