Submit Compositor Frame from OffscreenCanvas on main

content/browser/renderer_host/offscreen_canvas_frame_receiver_impl.cc

+// Copyright 2016 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/browser/renderer_host/offscreen_canvas_frame_receiver_impl.h"
+
+#include "base/bind_helpers.h"
+#include "cc/surfaces/surface.h"
+#include "cc/surfaces/surface_manager.h"
+#include "content/browser/compositor/surface_utils.h"
+#include "content/public/browser/browser_thread.h"
+
+namespace content {
+
+// static
+void OffscreenCanvasFrameReceiverImpl::Create(
+    mojo::InterfaceRequest<blink::mojom::OffscreenCanvasFrameReceiver>
+        request) {
+  // |binding_| will take ownership of OffscreenCanvasFrameReceiverImpl
+  new OffscreenCanvasFrameReceiverImpl(std::move(request));
+}
+
+OffscreenCanvasFrameReceiverImpl::OffscreenCanvasFrameReceiverImpl(
+    mojo::InterfaceRequest<blink::mojom::OffscreenCanvasFrameReceiver> request)
+    : binding_(this, std::move(request)) {}
+
+OffscreenCanvasFrameReceiverImpl::~OffscreenCanvasFrameReceiverImpl() {}
+
+void OffscreenCanvasFrameReceiverImpl::SubmitCompositorFrame(
+    const cc::SurfaceId& surface_id,
+    cc::CompositorFrame frame) {
+    cc::Surface* surface = GetSurfaceManager()->GetSurfaceForId(surface_id);
+    if (!!surface) {

[danakj, 2016/09/02 19:12:42]

you dont need !! for this

[xlai (Olivia), 2016/09/02 20:10:06]

Done.

+        surface->QueueFrame(std::move(frame), base::Closure());
+    }
+    // If surface doet not exist, drop the frame.
+}
+
+}  // namespace content