Add signalSyncPoint to the WebGraphicsContext3D command buffer impls.

cc/resources/sync_point_helper.cc

+// 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/sync_point_helper.h"
+
+#include "third_party/WebKit/Source/Platform/chromium/public/WebGraphicsContext3D.h"
+
+namespace cc {
+
+class SignalSyncPointCallbackClass
+    : public WebKit::WebGraphicsContext3D::WebGraphicsSyncPointCallback {
+ public:
+  SignalSyncPointCallbackClass(const base::Closure& closure)

[piman, 2013/04/26 01:20:52]

nit: explicit

+  : closure_(closure) {}

[piman, 2013/04/26 01:20:52]

nit: indent (':' at +4)

+
+  virtual void onSyncPointReached() {
+    if (!closure_.is_null())
+      closure_.Run();
+  }
+
+ private:
+  base::Closure closure_;
+};
+
+scoped_ptr<SyncPointHelper> SyncPointHelper::SignalSyncPoint(
+    WebKit::WebGraphicsContext3D* context3d,
+    unsigned sync_point,
+    const base::Closure& closure) {
+  scoped_ptr<SignalSyncPointCallbackClass> callback_class(
+      new SignalSyncPointCallbackClass(closure));
+
+  // Give a pointer to the CallbackClass to WebGraphicsContext3D.
+  context3d->signalSyncPoint(sync_point, callback_class.get());
+
+  // Store the ownership of the CallbackClass inside a SyncPointHelper and
+  // return it.
+  scoped_ptr<SyncPointHelper> helper(
+      new SyncPointHelper(callback_class.Pass()));
+  return helper.Pass();
+}
+
+SyncPointHelper::SyncPointHelper(
+    scoped_ptr<SignalSyncPointCallbackClass> callback_class)
+    : callback_class_(callback_class.Pass()) {}
+
+SyncPointHelper::~SyncPointHelper() {}
+
+}  // namespace cc