First cut at custom user style sheets.

chrome/browser/user_style_sheet_watcher_unittest.cc

+// Copyright (c) 2010 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 "chrome/browser/user_style_sheet_watcher.h"
+
+#include "base/base64.h"
+#include "base/file_util.h"
+#include "base/message_loop.h"
+#include "base/scoped_temp_dir.h"
+#include "base/string_util.h"
+#include "chrome/browser/chrome_thread.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+TEST(UserStyleSheetWatcherTest, StyleLoad) {
+  ScopedTempDir dir;
+  ASSERT_TRUE(dir.CreateUniqueTempDir());
+
+  std::string css_file_contents = "a { color: green; }";
+  FilePath style_sheet_file = dir.path().AppendASCII("User StyleSheets")
+                              .AppendASCII("Custom.css");
+  file_util::CreateDirectory(style_sheet_file.DirName());
+  ASSERT_TRUE(file_util::WriteFile(style_sheet_file,
+              css_file_contents.data(), css_file_contents.length()));
+
+  scoped_refptr<UserStyleSheetWatcher> style_sheet_watcher =
+      new UserStyleSheetWatcher(dir.path());
+  MessageLoop loop;
+  ChromeThread ui_thread(ChromeThread::UI, &loop);
+  ChromeThread file_thread(ChromeThread::FILE, &loop);
+  style_sheet_watcher->Init();
+
+  loop.RunAllPending();
+
+  GURL result_url = style_sheet_watcher->user_style_sheet();
+  std::string result = result_url.spec();
+  std::string prefix = "data:text/css;charset=utf-8;base64,";
+  EXPECT_TRUE(StartsWithASCII(result, prefix, true));
+  result = result.substr(prefix.length());
+  std::string decoded;
+  EXPECT_TRUE(base::Base64Decode(result, &decoded));
+  EXPECT_EQ(css_file_contents, decoded);
+}