events: Remove ability to terminate a nested message-loop from the event-source.

ui/events/platform/platform_event_source.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/events/platform/platform_event_source.h"
 
 #include <algorithm>
 
 #include "base/message_loop/message_loop.h"
 #include "ui/events/event.h"
@@ skipping 47 matching lines @@
   observers_.AddObserver(observer);
 }
 
 void PlatformEventSource::RemovePlatformEventObserver(
     PlatformEventObserver* observer) {
   observers_.RemoveObserver(observer);
 }
 
 uint32_t PlatformEventSource::DispatchEvent(PlatformEvent platform_event) {
   uint32_t action = POST_DISPATCH_PERFORM_DEFAULT;
-  bool should_quit = false;
 
   FOR_EACH_OBSERVER(PlatformEventObserver, observers_,
                     WillProcessEvent(platform_event));
   // Give the overridden dispatcher a chance to dispatch the event first.
   if (overridden_dispatcher_)
     action = overridden_dispatcher_->DispatchEvent(platform_event);
-  should_quit = !!(action & POST_DISPATCH_QUIT_LOOP);
 
   if ((action & POST_DISPATCH_PERFORM_DEFAULT) &&
       dispatchers_.might_have_observers()) {
     ObserverList<PlatformEventDispatcher>::Iterator iter(dispatchers_);
     while (PlatformEventDispatcher* dispatcher = iter.GetNext()) {
       if (dispatcher->CanDispatchEvent(platform_event))
         action = dispatcher->DispatchEvent(platform_event);
-      if (action & POST_DISPATCH_QUIT_LOOP)
-        should_quit = true;
       if (action & POST_DISPATCH_STOP_PROPAGATION)
         break;
     }
   }
   FOR_EACH_OBSERVER(PlatformEventObserver, observers_,
                     DidProcessEvent(platform_event));
 
-  // Terminate the message-loop if the dispatcher requested for it.
-  if (should_quit) {
-    base::MessageLoop::current()->QuitNow();
-    action |= POST_DISPATCH_QUIT_LOOP;
-  }
-
   // If an overridden dispatcher has been destroyed, then the platform
   // event-source should halt dispatching the current stream of events, and wait
   // until the next message-loop iteration for dispatching events. This lets any
   // nested message-loop to unwind correctly and any new dispatchers to receive
   // the correct sequence of events.
   if (overridden_dispatcher_restored_)
-    action |= POST_DISPATCH_QUIT_LOOP;
+    StopCurrentEventStream();
 
   overridden_dispatcher_restored_ = false;
 
   return action;
 }
 
+void PlatformEventSource::StopCurrentEventStream() {
+}
+
 void PlatformEventSource::OnDispatcherListChanged() {
 }
 
 void PlatformEventSource::OnOverriddenDispatcherRestored() {
   CHECK(overridden_dispatcher_);
   overridden_dispatcher_restored_ = true;
 }
 
 }  // namespace ui