Don't DCHECK if a watched directory doesn't exist.

base/directory_watcher_unittest.cc

 // Copyright (c) 2008 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 "base/directory_watcher.h"
 
 #include <fstream>
 
 #include "build/build_config.h"
 
@@ skipping 166 matching lines @@
   Deleter deleter(watcher);  // Takes ownership of watcher.
   ASSERT_TRUE(watcher->Watch(test_dir_, &deleter));
 
   WriteTestDirFile(FILE_PATH_LITERAL("test_file"), "some content");
   LoopUntilModsEqual(2);
 
   // We win if we haven't crashed yet.
   // Might as well double-check it got deleted, too.
   ASSERT_TRUE(deleter.watcher_.get() == NULL);
 }
+
+// Verify that watching a directory that doesn't exist fails, but doesn't
+// asssert.
+// Basic test: add a file and verify we notice it.
+TEST_F(DirectoryWatcherTest, NonExistantDirectory) {

[Evan Martin, 2009/01/07 18:47:57]

s/Existant/Existent/

+  DirectoryWatcher watcher;
+  ASSERT_FALSE(watcher.Watch(
+      test_dir_.Append(FILE_PATH_LITERAL("does-not-exist")), this));
+}