Add clear_browser_cache flag to test.dart

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;
 import "dart:core";
 import "dart:io";
 
@@ skipping 31 matching lines @@
    */
   Process process;
 
   Function logger;
 
   /**
    * Id of the browser
    */
   String id;
 
+  /**
+   * Delete the browser specific caches on startup.
+   * Browser specific implementations are free to ignore this.
+   */
+  static bool deleteCache = false;
+
   /** Print everything (stdout, stderr, usageLog) whenever we add to it */
   bool debugPrint = false;
 
   // This future returns when the process exits. It is also the return value
   // of close()
   Future done;
 
   Browser();
 
   factory Browser.byName(String name,
@@ skipping 229 matching lines @@
       } else {
         _logEvent("${paths.current} is not present");
         return deleteIfExists(paths);
       }
     });
   }
 
   // Clears the cache if the static deleteCache flag is set.
   // Returns false if the command to actually clear the cache did not complete.
   Future<bool> clearCache() {
-    if (!deleteCache) return new Future.value(true);
+    if (!Browser.deleteCache) return new Future.value(true);
     var home = Platform.environment['HOME'];
     Iterator iterator = CACHE_DIRECTORIES.map((s) => "$home/$s").iterator;
     return deleteIfExists(iterator);
   }
 
   Future<String> getVersion() {
     /**
      * Example of the file:
      * <?xml version="1.0" encoding="UTF-8"?>
      * <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
@@ skipping 55 matching lines @@
           });
         }).catchError((error) {
           _logEvent("Running $_binary --version failed with $error");
           return false;
         });
       });
     });
   }
 
   String toString() => "Safari";
-
-  // Delete the user specific browser cache and profile data.
-  // Safari only have one per user, and you can't specify one by command line.
-  static bool deleteCache = false;
-
 }
 
 
 class Chrome extends Browser {
   String _version = "Version not found yet";
 
   Map<String, String> _getEnvironment() => null;
 
   Future<bool> _getVersion() {
     if (Platform.isWindows) {
@@ skipping 81 matching lines @@
         var findString = "REG_SZ";
         var index = result.stdout.indexOf(findString);
         if (index > 0) {
           return result.stdout.substring(index + findString.length).trim();
         }
       }
       return "Could not get the version of internet explorer";
     });
   }
 
+  // Clears the recovery cache if the static deleteCache flag is set.
+  Future<bool> clearCache() {
+    if (!Browser.deleteCache) return new Future.value(true);
+    var localAppData = Platform.environment['LOCALAPPDATA'];
+
+    Directory dir = new Directory("$localAppData\\Microsoft\\"
+                                  "Internet Explorer\\Recovery");
+    return dir.delete(recursive: true)
+      .then((_) { return true; })
+      .catchError((error) {
+        _logEvent("Deleting recovery dir failed with $error");
+        return false;
+      });
+  }
+
   Future<bool> start(String url) {
     _logEvent("Starting ie browser on: $url");
-    return getVersion().then((version) {
+    return clearCache().then((_) => getVersion()).then((version) {
       _logEvent("Got version: $version");
       return startBrowser(_binary, [url]);
     });
   }
   String toString() => "IE";
+
 }
 
 
 class AndroidBrowserConfig {
   final String name;
   final String package;
   final String activity;
   final String action;
   AndroidBrowserConfig(this.name, this.package, this.activity, this.action);
 }
@@ skipping 992 matching lines @@
     Dart test driver, number of tests: <div id="number"></div><br>
     Currently executing: <div id="currently_executing"></div><br>
     Unhandled error: <div id="unhandled_error"></div>
     <iframe id="embedded_iframe"></iframe>
   </body>
 </html>
 """;
     return driverContent;
   }
 }