Allow multiple logging::LogMessage{Handler,Listener}s

chrome/browser/media/webrtc/webrtc_browsertest_base.h

 // 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.
 
 #ifndef CHROME_BROWSER_MEDIA_WEBRTC_WEBRTC_BROWSERTEST_BASE_H_
 #define CHROME_BROWSER_MEDIA_WEBRTC_WEBRTC_BROWSERTEST_BASE_H_
 
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/media/webrtc/test_stats_dictionary.h"
 #include "chrome/test/base/in_process_browser_test.h"
 
 namespace infobars {
 class InfoBar;
 }
 
 namespace content {
 class WebContents;
 }
 
+class JavascriptErrorDetectingListener : logging::LogMessageListener {

[grt (UTC plus 2), 2017/01/04 09:12:20]

public

+ public:
+  void OnMessage(int severity,
+                 const char* file,
+                 int line,
+                 size_t message_start,
+                 const std::string& str) override;
+};
+
 // Base class for WebRTC browser tests with useful primitives for interacting
 // getUserMedia. We use inheritance here because it makes the test code look
 // as clean as it can be.
 class WebRtcTestBase : public InProcessBrowserTest {
  public:
   // Typical constraints.
   static const char kAudioVideoCallConstraints[];
   static const char kAudioOnlyCallConstraints[];
   static const char kVideoOnlyCallConstraints[];
   static const char kVideoCallConstraintsQVGA[];
@@ skipping 159 matching lines @@
                            content::WebContents* to_tab) const;
   void ReceiveAnswer(const std::string& answer,
                      content::WebContents* from_tab) const;
   void GatherAndSendIceCandidates(content::WebContents* from_tab,
                                   content::WebContents* to_tab) const;
 
   infobars::InfoBar* GetUserMediaAndWaitForInfoBar(
       content::WebContents* tab_contents,
       const std::string& constraints) const;
 
+  JavascriptErrorDetectingListener listener_;
   bool detect_errors_in_javascript_;
 
   DISALLOW_COPY_AND_ASSIGN(WebRtcTestBase);
 };
 
 #endif  // CHROME_BROWSER_MEDIA_WEBRTC_WEBRTC_BROWSERTEST_BASE_H_