Hide console log messages for imported WPT tests

content/shell/test_runner/web_test_delegate.h

Index: content/shell/test_runner/web_test_delegate.h
diff --git a/content/shell/test_runner/web_test_delegate.h b/content/shell/test_runner/web_test_delegate.h
index 53f803e46e37b0ba130992092125ab365cd5fff0..b9d3357e81f4e475870ea2264de756c650d71edc 100644
--- a/content/shell/test_runner/web_test_delegate.h
+++ b/content/shell/test_runner/web_test_delegate.h
@@ -70,6 +70,10 @@ class WebTestDelegate {
   virtual void SetDeviceOrientationData(
       const blink::WebDeviceOrientationData& data) = 0;
 
+  // Add a message to stderr (not saved to expected output files, for debugging
+  // only).
+  virtual void PrintLogMessage(const std::string& message) = 0;

[Peter Beverloo, 2017/03/09 15:07:49]

Here and elsewhere: The difference between "PrintMessage" and "PrintLogMessage"
is not clear from the method naming itself. Since the latter is specifically
about printing to stderr, what about "PrintStderrMessage", or even
"PrintErrorMessage"?

[Dan Elphick, 2017/03/09 21:18:30]

I wanted to avoid PrintErrorMessage because it sounds like an error where in
many cases these messages are informational. PrintStderrMessage is probably the
best we can do as it certainly avoids confusion.

+
   // Add a message to the text dump for the layout test.
   virtual void PrintMessage(const std::string& message) = 0;