Introduce runtime.onSuspendCanceled() event.

chrome/browser/extensions/extension_event_router.cc

 // Copyright (c) 2012 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 "chrome/browser/extensions/extension_event_router.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/message_loop.h"
 #include "base/values.h"
@@ skipping 418 matching lines @@
       !process_map->Contains(extension->id(), process->GetID())) {
     return;
   }
 
   const Value* event_args = NULL;
   if (!CanDispatchEventToProfile(listener_profile, extension,
                                  event, &event_args)) {
     return;
   }
 
+  // We need to call IncrementInFlightEvents() before DispatchEvent() because
+  // the former may prevent this extension from getting suspended and so send
+  // the onSuspendCanceled() to the extension, which needs to arrive before the
+  // event that DispatchEvent() is dispatching.
+  IncrementInFlightEvents(listener_profile, extension);
+
   DispatchEvent(process, extension_id,
                 event->event_name, *event_args,
                 event->event_url, event->user_gesture,
                 event->info);
-  IncrementInFlightEvents(listener_profile, extension);
 }
 
 bool ExtensionEventRouter::CanDispatchEventToProfile(
     Profile* profile,
     const Extension* extension,
     const linked_ptr<ExtensionEvent>& event,
     const Value** event_args) {
   *event_args = event->event_args.get();
 
   // Is this event from a different profile than the renderer (ie, an
@@ skipping 165 matching lines @@
       event_args(event_args.DeepCopy()),
       event_url(event_url),
       restrict_to_profile(restrict_to_profile),
       cross_incognito_args(NULL),
       user_gesture(user_gesture),
       info(info) {
 }
 
 ExtensionEvent::~ExtensionEvent() {
 }