Explicitly initialize secondary renderers for layout tests.

content/shell/renderer/layout_test/blink_test_runner.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_SHELL_RENDERER_LAYOUT_TEST_BLINK_TEST_RUNNER_H_
 #define CONTENT_SHELL_RENDERER_LAYOUT_TEST_BLINK_TEST_RUNNER_H_
 
 #include <deque>
 #include <memory>
 #include <vector>
@@ skipping 152 matching lines @@
   void Reset(bool for_new_test);
 
   void set_proxy(test_runner::WebTestProxyBase* proxy) { proxy_ = proxy; }
   test_runner::WebTestProxyBase* proxy() const { return proxy_; }
 
   void ReportLeakDetectionResult(const LeakDetectionResult& result);
 
   // Message handlers forwarded by LayoutTestRenderFrameObserver.
   void OnSetTestConfiguration(const ShellTestConfiguration& params);
   void OnReplicateTestConfiguration(const ShellTestConfiguration& params);
+  void OnSetupSecondaryRenderer();
 
  private:
   // Message handlers.
   void OnSessionHistory(
       const std::vector<int>& routing_ids,
       const std::vector<std::vector<PageState> >& session_histories,
       const std::vector<unsigned>& current_entry_indexes);
   void OnReset();
   void OnNotifyDone();
   void OnTryLeakDetection();
@@ skipping 31 matching lines @@
   bool focus_on_next_commit_;
 
   std::unique_ptr<LeakDetector> leak_detector_;
 
   DISALLOW_COPY_AND_ASSIGN(BlinkTestRunner);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_SHELL_RENDERER_LAYOUT_TEST_BLINK_TEST_RUNNER_H_