Add the main frame routing ID to WebContentsDelegate, use it in BackgroundContents.

content/shell/browser/webkit_test_controller.cc

 // Copyright 2013 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 "content/shell/browser/webkit_test_controller.h"
 
 #include <iostream>
 
 #include "base/base64.h"
 #include "base/command_line.h"
@@ skipping 242 matching lines @@
   initial_size_ = gfx::Size(
       Shell::kDefaultTestWindowWidthDip, Shell::kDefaultTestWindowHeightDip);
   // The W3C SVG layout tests use a different size than the other layout tests.
   if (test_url.spec().find("W3C-SVG-1.1") != std::string::npos)
     initial_size_ = gfx::Size(kTestSVGWindowWidthDip, kTestSVGWindowHeightDip);
   if (!main_window_) {
     main_window_ = content::Shell::CreateNewWindow(
         browser_context,
         GURL(),
         NULL,
-        MSG_ROUTING_NONE,
         initial_size_);
     WebContentsObserver::Observe(main_window_->web_contents());
     send_configuration_to_next_host_ = true;
     current_pid_ = base::kNullProcessId;
     main_window_->LoadURL(test_url);
   } else {
 #if defined(OS_MACOSX)
     // Shell::SizeTo is not implemented on all platforms.
     main_window_->SizeTo(initial_size_);
 #endif
@@ skipping 70 matching lines @@
   }
 }
 
 void WebKitTestController::OpenURL(const GURL& url) {
   if (test_phase_ != DURING_TEST)
     return;
 
   Shell::CreateNewWindow(main_window_->web_contents()->GetBrowserContext(),
                          url,
                          main_window_->web_contents()->GetSiteInstance(),
-                         MSG_ROUTING_NONE,
                          gfx::Size());
 }
 
 void WebKitTestController::TestFinishedInSecondaryWindow() {
   RenderViewHost* render_view_host =
       main_window_->web_contents()->GetRenderViewHost();
   render_view_host->Send(
       new ShellViewMsg_NotifyDone(render_view_host->GetRoutingID()));
 }
 
@@ skipping 319 matching lines @@
 
   printer_->AddErrorMessage(
       base::StringPrintf("#LEAK - renderer pid %d (%s)", current_pid_,
                          result.detail.c_str()));
   CHECK(!crash_when_leak_found_);
 
   DiscardMainWindow();
 }
 
 }  // namespace content