Introduce DisplayCompositor Mojo API for Mus

components/mus/surfaces/compositor_frame_sink_factory_impl.cc

Index: components/mus/surfaces/compositor_frame_sink_factory_impl.cc
diff --git a/components/mus/surfaces/compositor_frame_sink_factory_impl.cc b/components/mus/surfaces/compositor_frame_sink_factory_impl.cc
new file mode 100644
index 0000000000000000000000000000000000000000..ee549795a80509fe1711740a217957f1cc3af685
--- /dev/null
+++ b/components/mus/surfaces/compositor_frame_sink_factory_impl.cc
@@ -0,0 +1,41 @@
+// 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 {
+
+CompositorFrameSinkFactoryImpl::CompositorFrameSinkFactoryImpl(
+    int 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 sink_id) {
+  sinks_.erase(sink_id);
+}
+
+cc::SurfaceId CompositorFrameSinkFactoryImpl::GenerateSurfaceId() {
+  return allocator_.GenerateId();
+}
+
+void CompositorFrameSinkFactoryImpl::CreateCompositorFrameSink(
+    int sink_id,
+    mojo::InterfaceRequest<mojom::CompositorFrameSink> sink,
+    mojom::CompositorFrameSinkClientPtr client) {
+  sinks_[sink_id] = base::WrapUnique(new CompositorFrameSinkImpl(
+      this, sink_id, surfaces_state_, std::move(sink), std::move(client)));
+}
+
+}  // namespace mus