Added WARN_UNUSED_RESULT to ScopedTempDir methods.

chrome/test/ui_test_utils.h

Index: chrome/test/ui_test_utils.h
diff --git a/chrome/test/ui_test_utils.h b/chrome/test/ui_test_utils.h
index 5299451be35246be39bc9230e5cf3b76bc54d62c..323e3744a44fe16e5afc83816eb9effab2d68b0c 100644
--- a/chrome/test/ui_test_utils.h
+++ b/chrome/test/ui_test_utils.h
@@ -280,12 +280,15 @@ class TimedMessageLoopRunner {
 // server.
 class TestWebSocketServer {
  public:
-  // Creates and starts a python websocket server with |root_directory|.
-  explicit TestWebSocketServer(const FilePath& root_directory);
+  TestWebSocketServer();
 
-  // Destroys and stops the server.
+  // Stops the python websocket server if it was already started.
   ~TestWebSocketServer();
 
+  // Starts the python websocket server using |root_directory|. Returns whether
+  // the server was successfully started.
+  bool Start(const FilePath& root_directory);
+
  private:
   // Sets up PYTHONPATH to run websocket_server.py.
   void SetPythonPath();
@@ -296,6 +299,9 @@ class TestWebSocketServer {
   // Creates a CommandLine for invoking the python websocker server.
   CommandLine* CreateWebSocketServerCommandLine();
 
+  // Has the server been started?
+  bool started_;
+
   // A Scoped temporary directory for holding the python pid file.
   ScopedTempDir temp_dir_;