Allow POST requests made from an extension process to reuse the same process,

chrome/browser/renderer_host/browser_render_process_host.cc

 // Copyright (c) 2010 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.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "chrome/browser/renderer_host/browser_render_process_host.h"
 
 #include <algorithm>
@@ skipping 233 matching lines @@
   NotificationService::current()->Notify(
       NotificationType::EXTENSION_PORT_DELETED_DEBUG,
       Source<IPC::Message::Sender>(this),
       NotificationService::NoDetails());
 }
 
 bool BrowserRenderProcessHost::Init(bool is_extensions_process,
                                     URLRequestContextGetter* request_context) {
   // calling Init() more than once does nothing, this makes it more convenient
   // for the view host which may not be sure in some cases
-  if (channel_.get()) {
-    // Ensure that |is_extensions_process| doesn't change across multiple calls
-    // to Init().
-    if (!run_renderer_in_process()) {
-      DCHECK_EQ(extension_process_, is_extensions_process);
-    }
+  if (channel_.get())
     return true;
-  }
 
-  extension_process_ = is_extensions_process;
+  // It is possible for an extension process to be reused for non-extension
+  // content, e.g. if an extension calls window.open.
+  extension_process_ = extension_process_ || is_extensions_process;
 
   // run the IPC channel on the shared IO thread.
   base::Thread* io_thread = g_browser_process->io_thread();
 
   // Construct the AudioRendererHost with the IO thread.
   audio_renderer_host_ = new AudioRendererHost();
 
   scoped_refptr<ResourceMessageFilter> resource_message_filter =
       new ResourceMessageFilter(g_browser_process->resource_dispatcher_host(),
                                 id(),
@@ skipping 792 matching lines @@
         IPC::InvalidPlatformFileForTransit(),
         std::vector<std::string>(),
         std::string(),
         false));
   }
 }
 
 void BrowserRenderProcessHost::EnableAutoSpellCorrect(bool enable) {
   Send(new ViewMsg_SpellChecker_EnableAutoSpellCorrect(enable));
 }