Migrate ProcessesEventRouter to the new task manager

content/public/browser/web_contents_observer.h

 // 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.
 
 #ifndef CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_OBSERVER_H_
 #define CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_OBSERVER_H_
 
 #include <stdint.h>
 
 #include "base/macros.h"
 #include "base/process/kill.h"
 #include "base/process/process_handle.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/common/frame_navigate_params.h"
 #include "content/public/common/security_style.h"
 #include "ipc/ipc_listener.h"
 #include "ipc/ipc_sender.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/base/page_transition_types.h"
 #include "ui/base/window_open_disposition.h"
 
 namespace content {
 
 class NavigationEntry;
 class NavigationHandle;
 class RenderFrameHost;
 class RenderViewHost;
+class RenderWidgetHost;
 class WebContents;
 class WebContentsImpl;
 struct AXEventNotificationDetails;
 struct FaviconURL;
 struct FrameNavigateParams;
 struct LoadCommittedDetails;
 struct LoadFromMemoryCacheDetails;
 struct Referrer;
 struct ResourceRedirectDetails;
 struct ResourceRequestDetails;
@@ skipping 74 matching lines @@
   // choice.
   virtual void RenderProcessGone(base::TerminationStatus status) {}
 
   // This method is invoked when a WebContents swaps its visible RenderViewHost
   // with another one, possibly changing processes. The RenderViewHost that has
   // been replaced is in |old_host|, which is nullptr if the old RVH was shut
   // down.
   virtual void RenderViewHostChanged(RenderViewHost* old_host,
                                      RenderViewHost* new_host) {}
 
+  // This method is invoked when the process for the current main
+  // RenderFrameHost becomes unresponsive.
+  virtual void OnRendererUnresponsive(RenderWidgetHost* render_widget_host) {}
+
   // Navigation related events ------------------------------------------------
 
   // Called when a navigation started in the WebContents. |navigation_handle|
   // is unique to a specific navigation. The same |navigation_handle| will be
   // provided on subsequent calls to DidRedirectNavigation, DidFinishNavigation,
   // and ReadyToCommitNavigation when related to this navigation. Observers
   // should clear any references to |navigation_handle| in DidFinishNavigation,
   // just before it is destroyed.
   //
   // Note that this is fired by navigations in any frame of the WebContents,
@@ skipping 351 matching lines @@
   void ResetWebContents();
 
   WebContentsImpl* web_contents_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsObserver);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_OBSERVER_H_