Fix RPHI message queueing during process death

content/public/browser/render_process_host.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_RENDER_PROCESS_HOST_H_
 #define CONTENT_PUBLIC_BROWSER_RENDER_PROCESS_HOST_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 67 matching lines @@
   // General functions ---------------------------------------------------------
 
   ~RenderProcessHost() override {}
 
   // Initialize the new renderer process, returning true on success. This must
   // be called once before the object can be used, but can be called after
   // that with no effect. Therefore, if the caller isn't sure about whether
   // the process has been created, it should just call Init().
   virtual bool Init() = 0;
 
+  // Ensures that a Channel exists and is at least queueing outgoing messages
+  // if there isn't a render process connected to it yet. This may be used to
+  // ensure that in the event of a renderer crash and restart, subsequent
+  // messages sent via Send() will eventually reach the new process.
+  virtual void EnsureHasChannel() = 0;
+
   // Gets the next available routing id.
   virtual int GetNextRoutingID() = 0;
 
   // These methods add or remove listener for a specific message routing ID.
   // Used for refcounting, each holder of this object must AddRoute and
   // RemoveRoute. This object should be allocated on the heap; when no
   // listeners own it any more, it will delete itself.
   virtual void AddRoute(int32_t routing_id, IPC::Listener* listener) = 0;
   virtual void RemoveRoute(int32_t routing_id) = 0;
 
@@ skipping 282 matching lines @@
   static void SetMaxRendererProcessCount(size_t count);
 
   // Returns the current maximum number of renderer process hosts kept by the
   // content module.
   static size_t GetMaxRendererProcessCount();
 };
 
 }  // namespace content.
 
 #endif  // CONTENT_PUBLIC_BROWSER_RENDER_PROCESS_HOST_H_