Introduce DisplayCompositor Mojo API for Mus

components/mus/surfaces/compositor_frame_sink_factory_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 "components/mus/surfaces/compositor_frame_sink_factory_impl.h"
+
+#include "base/memory/ptr_util.h"
+#include "cc/surfaces/surface_id.h"
+#include "components/mus/surfaces/compositor_frame_sink_impl.h"
+
+namespace mus {
+namespace gpu {
+
+CompositorFrameSinkFactoryImpl::CompositorFrameSinkFactoryImpl(
+    uint32_t client_id,
+    mojo::InterfaceRequest<mojom::CompositorFrameSinkFactory> request,
+    const scoped_refptr<SurfacesState>& surfaces_state)
+    : client_id_(client_id),
+      surfaces_state_(surfaces_state),
+      allocator_(client_id),
+      binding_(this, std::move(request)) {}
+
+CompositorFrameSinkFactoryImpl::~CompositorFrameSinkFactoryImpl() {}
+
+void CompositorFrameSinkFactoryImpl::CompositorFrameSinkConnectionLost(
+    int local_id) {
+  sinks_.erase(local_id);
+}
+
+cc::SurfaceId CompositorFrameSinkFactoryImpl::GenerateSurfaceId() {
+  return allocator_.GenerateId();
+}
+
+void CompositorFrameSinkFactoryImpl::CreateCompositorFrameSink(
+    uint32_t local_id,
+    uint64_t nonce,
+    mojo::InterfaceRequest<mojom::CompositorFrameSink> sink,
+    mojom::CompositorFrameSinkClientPtr client) {
+  // TODO(fsamuel): Use nonce once patch lands:

[Tom Sepez, 2016/05/26 23:41:20]

ok.

[Fady Samuel, 2016/05/26 23:49:24]

Ahh, it has landed, I'll plumb nonce in a followup CL.

+  // https://codereview.chromium.org/1996783002/
+  sinks_[local_id] = base::WrapUnique(new CompositorFrameSinkImpl(
+      this, local_id, surfaces_state_, std::move(sink), std::move(client)));
+}
+
+}  // namespace gpu
+}  // namespace mus