Add TestBrowserThreadBundle into RenderViewHostTestHarness. Kill some unnecessary real threads.

content/public/test/test_browser_thread_bundle.cc

+// Copyright (c) 2013 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 "content/public/test/test_browser_thread_bundle.h"
+
+#include "base/run_loop.h"
+
+namespace content {
+
+TestBrowserThreadBundle::TestBrowserThreadBundle()
+  : ui_thread_(BrowserThread::UI, &message_loop_),
+    db_thread_(BrowserThread::DB, &message_loop_),
+    file_thread_(BrowserThread::FILE, &message_loop_),
+    file_user_blocking_thread_(BrowserThread::FILE_USER_BLOCKING,
+                               &message_loop_),
+    io_thread_(BrowserThread::IO, &message_loop_) {

[Jeffrey Yasskin, 2013/05/22 22:24:58]

Did you find a way to deal with things DCHECK'ing that they're running on an IO
loop? Might want to comment about how to deal with such things in the future.

[awong, 2013/05/24 23:39:28]

For now, the solution is to start a real IO thread. I'll add a comment.

+}
+
+TestBrowserThreadBundle::TestBrowserThreadBundle(int real_threads_mask)
+  : ui_thread_(BrowserThread::UI, &message_loop_),
+    db_thread_(BrowserThread::DB,
+               real_threads_mask & REAL_DB_THREAD ? NULL : &message_loop_),
+    file_thread_(BrowserThread::FILE,
+               real_threads_mask & REAL_FILE_THREAD ? NULL : &message_loop_),
+    file_user_blocking_thread_(BrowserThread::FILE_USER_BLOCKING,
+               real_threads_mask & REAL_FILE_USER_BLOCKING_THREAD ?
+                   NULL : &message_loop_),
+    io_thread_(BrowserThread::IO,
+               real_threads_mask & REAL_IO_THREAD ? NULL : &message_loop_) {
+  if (real_threads_mask & REAL_DB_THREAD) {
+    db_thread_.Start();
+  }
+  if (real_threads_mask & REAL_FILE_THREAD) {
+    file_thread_.Start();
+  }
+  if (real_threads_mask & REAL_FILE_USER_BLOCKING_THREAD) {
+    file_user_blocking_thread_.Start();
+  }
+  if (real_threads_mask & REAL_IO_THREAD) {
+    io_thread_.StartIOThread();
+  }
+}
+
+TestBrowserThreadBundle::~TestBrowserThreadBundle() {
+  base::RunLoop().RunUntilIdle();
+}
+
+}  // namespace content