Mojo: Add the ability to notify a Mojo Channel that it's going to be destroyed soon.

content/browser/mojo/mojo_application_host.h

 // 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.
 
 #ifndef CONTENT_BROWSER_MOJO_MOJO_APPLICATION_HOST_H_
 #define CONTENT_BROWSER_MOJO_MOJO_APPLICATION_HOST_H_
 
 #include "base/process/process_handle.h"
 #include "content/common/mojo/service_registry_impl.h"
 #include "mojo/embedder/channel_init.h"
@@ skipping 14 matching lines @@
  public:
   MojoApplicationHost();
   virtual ~MojoApplicationHost();
 
   // Two-phase initialization:
   //  1- Init makes service_registry() available synchronously.
   //  2- Activate establishes the actual connection to the peer process.
   bool Init();
   bool Activate(IPC::Sender* sender, base::ProcessHandle process_handle);
 
+  void WillDestroySoon();
+
   bool did_activate() const { return did_activate_; }
 
   ServiceRegistry* service_registry() { return &service_registry_; }
 
  private:
   mojo::embedder::ChannelInit channel_init_;
   mojo::embedder::ScopedPlatformHandle client_handle_;
 
   bool did_activate_;
 
   ServiceRegistryImpl service_registry_;
 
   DISALLOW_COPY_AND_ASSIGN(MojoApplicationHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_MOJO_MOJO_APPLICATION_HOST_H_