Opt-in stripping of line numbers from console messages of layout tests.

components/test_runner/web_frame_test_client.cc

 // Copyright 2016 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 "components/test_runner/web_frame_test_client.h"
 
 #include <memory>
 
 #include "base/logging.h"
 #include "base/strings/string_piece.h"
@@ skipping 670 matching lines @@
     case blink::WebConsoleMessage::LevelWarning:
       level = "WARNING";
       break;
     case blink::WebConsoleMessage::LevelError:
       level = "ERROR";
       break;
     default:
       level = "MESSAGE";
   }
   delegate_->PrintMessage(std::string("CONSOLE ") + level + ": ");
-  if (source_line) {
+  if (source_line && test_runner_->shouldDumpConsoleLineNumbers()) {
     delegate_->PrintMessage(base::StringPrintf("line %d: ", source_line));
   }
   if (!message.text.isEmpty()) {
     std::string new_message;
     new_message = message.text.utf8();
     size_t file_protocol = new_message.find("file://");
     if (file_protocol != std::string::npos) {
       new_message = new_message.substr(0, file_protocol) +
                     URLSuitableForTestResult(new_message.substr(file_protocol));
     }
@@ skipping 53 matching lines @@
 
 bool WebFrameTestClient::runFileChooser(
     const blink::WebFileChooserParams& params,
     blink::WebFileChooserCompletion* completion) {
   delegate_->PrintMessage("Mock: Opening a file chooser.\n");
   // FIXME: Add ability to set file names to a file upload control.
   return false;
 }
 
 }  // namespace test_runner