[Android] Upstream ChromeBrowserProvider, the Android port ContentProvider implementation.

chrome/browser/android/provider/blocking_ui_thread_async_request.cc

Index: chrome/browser/android/provider/blocking_ui_thread_async_request.cc
diff --git a/chrome/browser/android/provider/blocking_ui_thread_async_request.cc b/chrome/browser/android/provider/blocking_ui_thread_async_request.cc
new file mode 100644
index 0000000000000000000000000000000000000000..7267e583ef55d4d8ae29219d8fcf466f6ab83ec3
--- /dev/null
+++ b/chrome/browser/android/provider/blocking_ui_thread_async_request.cc
@@ -0,0 +1,17 @@
+// Copyright (c) 2012 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/android/provider/blocking_ui_thread_async_request.h"
+
+BlockingUIThreadAsyncRequest::BlockingUIThreadAsyncRequest()
+    : request_completed_(false, false) {
+}
+
+void BlockingUIThreadAsyncRequest::RequestCompleted() {
+  // Currently all our use cases receive their request response in the UI
+  // thread (the same thread that made the request). However this is not
+  // a design constraint and can be changed if ever needed.
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  request_completed_.Signal();
+}