cc: Move TextureMailbox::ReleaseCallback to SingleReleaseCallback.

cc/resources/single_release_callback.cc

Index: cc/resources/single_release_callback.cc
diff --git a/cc/resources/single_release_callback.cc b/cc/resources/single_release_callback.cc
new file mode 100644
index 0000000000000000000000000000000000000000..9c6b9de5f07635a26c55567e3059277c0d609083
--- /dev/null
+++ b/cc/resources/single_release_callback.cc
@@ -0,0 +1,29 @@
+// Copyright 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 "cc/resources/single_release_callback.h"
+
+#include "base/callback_helpers.h"
+#include "base/logging.h"
+
+namespace cc {
+
+SingleReleaseCallback::SingleReleaseCallback(const ReleaseCallback& callback)
+    : has_been_run_(false), callback_(callback) {
+  DCHECK(!callback_.is_null())
+      << "Use a NULL SingleReleaseCallback for an empty callback.";
+}
+
+SingleReleaseCallback::~SingleReleaseCallback() {
+  DCHECK(callback_.is_null() || has_been_run_)
+      << "SingleReleaseCallback was never run.";
+}
+
+void SingleReleaseCallback::Run(unsigned sync_point, bool is_lost) {
+  DCHECK(!has_been_run_) << "SingleReleaseCallback was run more than once.";
+  has_been_run_ = true;
+  callback_.Run(sync_point, is_lost);
+}
+
+}  // namespace cc