cc: Use correct message loop proxy in BlockingTaskRunner

cc/resources/single_release_callback_impl.cc

Index: cc/resources/single_release_callback_impl.cc
diff --git a/cc/resources/single_release_callback_impl.cc b/cc/resources/single_release_callback_impl.cc
new file mode 100644
index 0000000000000000000000000000000000000000..53e05013c1646c43d1315edbfc8f5bec49a8789d
--- /dev/null
+++ b/cc/resources/single_release_callback_impl.cc
@@ -0,0 +1,34 @@
+// Copyright 2014 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 "cc/resources/single_release_callback_impl.h"
+
+#include "base/callback_helpers.h"
+#include "base/logging.h"
+#include "cc/trees/blocking_task_runner.h"
+
+namespace cc {
+
+SingleReleaseCallbackImpl::SingleReleaseCallbackImpl(
+    const ReleaseCallbackImpl& callback)
+    : has_been_run_(false), callback_(callback) {
+  DCHECK(!callback_.is_null())
+      << "Use a NULL SingleReleaseCallbackImpl for an empty callback.";
+}
+
+SingleReleaseCallbackImpl::~SingleReleaseCallbackImpl() {
+  DCHECK(callback_.is_null() || has_been_run_)
+      << "SingleReleaseCallbackImpl was never run.";
+}
+
+void SingleReleaseCallbackImpl::Run(
+    uint32 sync_point,
+    bool is_lost,
+    scoped_refptr<BlockingTaskRunner> main_thread_task_runner) {
+  DCHECK(!has_been_run_) << "SingleReleaseCallbackImpl was run more than once.";
+  has_been_run_ = true;
+  callback_.Run(sync_point, is_lost, main_thread_task_runner);
+}
+
+}  // namespace cc