Add debug logging for android testing.

tools/testing/dart/browser_controller.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 library browser;
 
 import "dart:async";
 import "dart:convert" show LineSplitter, UTF8, JSON;
 import "dart:core";
 import "dart:io";
 
@@ skipping 1069 matching lines @@
       status.lastTest = status.currentTest;
       status.currentTest = null;
 
       // We don't want to start a new browser if we are terminating.
       if (underTermination) return;
       restartBrowser(id);
     });
   }
 
   void restartBrowser(String id) {
+    if (browserName.contains('OnAndroid')) {
+      DebugLogger.info("Restarting browser $id");
+    }
     var browser;
     var new_id = id;
     if (browserName == 'chromeOnAndroid') {
       browser = new AndroidChrome(adbDeviceMapping[id]);
     } else if (browserName == 'ContentShellOnAndroid') {
       browser = new AndroidBrowser(adbDeviceMapping[id],
                                    contentShellOnAndroidConfig,
                                    checkedMode,
                                    configuration['drt']);
     } else if (browserName == 'DartiumOnAndroid') {
@@ skipping 82 matching lines @@
       exit(1);
     }
 
     status.currentTest.timeoutTimer = createTimeoutTimer(test, status);
     status.currentTest.stopwatch = new Stopwatch()..start();
 
     // Reset the test specific output information (stdout, stderr) on the
     // browser, since a new test is being started.
     status.browser.resetTestBrowserOutput();
     status.browser.logBrowserInfoToTestBrowserOutput();
+    if (browserName.contains('OnAndroid')) {
+      DebugLogger.info("Browser $browserId getting test ${test.url}");
+    }
 
     return test;
   }
 
   Timer createTimeoutTimer(BrowserTest test, BrowserTestingStatus status) {
     return new Timer(new Duration(seconds: test.timeout),
                      () { handleTimeout(status); });
   }
 
   Timer createNextTestTimer(BrowserTestingStatus status) {
@@ skipping 584 matching lines @@
     </div>
     <div id="embedded_iframe_div" class="test box">
       <iframe style="width:100%;height:100%;" id="embedded_iframe"></iframe>
     </div>
   </body>
 </html>
 """;
     return driverContent;
   }
 }