Hide console log messages for imported WPT tests

content/shell/test_runner/web_test_delegate.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 CONTENT_SHELL_TEST_RUNNER_WEB_TEST_DELEGATE_H_
 #define CONTENT_SHELL_TEST_RUNNER_WEB_TEST_DELEGATE_H_
 
 #include <memory>
 #include <string>
 #include <vector>
@@ skipping 52 matching lines @@
   // Platform::setDeviceLightListener().
   virtual void SetDeviceLightData(const double data) = 0;
   // Set data to return when registering via
   // Platform::setDeviceMotionListener().
   virtual void SetDeviceMotionData(const blink::WebDeviceMotionData& data) = 0;
   // Set data to return when registering via
   // Platform::setDeviceOrientationListener().
   virtual void SetDeviceOrientationData(
       const blink::WebDeviceOrientationData& data) = 0;
 
+  // Add a message to stderr.

[Rick Byers, 2017/03/09 13:22:24]

nit: explicitly add "(not saved to expected output files, for debugging only)"
to make the purpose clear.

[Dan Elphick, 2017/03/09 13:41:40]

Done.

+  virtual void PrintLogMessage(const std::string& message) = 0;
+
   // Add a message to the text dump for the layout test.
   virtual void PrintMessage(const std::string& message) = 0;
 
   // The delegate takes ownership of the WebTask objects and is responsible
   // for deleting them.
   virtual void PostTask(const base::Closure& task) = 0;
   virtual void PostDelayedTask(const base::Closure& task, long long ms) = 0;
 
   // Register a new isolated filesystem with the given files, and return the
   // new filesystem id.
@@ skipping 212 matching lines @@
 
   // PlzNavigate
   // Indicates if the navigation was initiated by the browser or renderer.
   virtual bool IsNavigationInitiatedByRenderer(
       const blink::WebURLRequest& request) = 0;
 };
 
 }  // namespace test_runner
 
 #endif  // CONTENT_SHELL_TEST_RUNNER_WEB_TEST_DELEGATE_H_