Bug 1133003 part A - send a global observer notification when Flash hangs, r=aklotz

dom/plugins/ipc/PluginModuleParent.cpp

@@ -897,6 +897,13 @@ CreateFlashMinidump(DWORD processId, ThreadId childThread,
 bool
 PluginModuleChromeParent::ShouldContinueFromReplyTimeout()
 {
+    if (mIsFlashPlugin) {
+        MessageLoop::current()->PostTask(
+            FROM_HERE,
+            mTaskFactory.NewRunnableMethod(
+                &PluginModuleChromeParent::NotifyFlashHang));
+    }
+
 #ifdef XP_WIN
     if (LaunchHangUI()) {
         return true;
@@ -1279,6 +1286,15 @@ PluginModuleChromeParent::ActorDestroy(ActorDestroyReason why)
     PluginModuleParent::ActorDestroy(why);
 }
 
+void
+PluginModuleParent::NotifyFlashHang()
+{
+    nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
+    if (obs) {
+        obs->NotifyObservers(nullptr, "flash-plugin-hang", nullptr);
+    }
+}
+
 void
 PluginModuleParent::NotifyPluginCrashed()
 {