content/blimp: Set up hooks for enabling LTHRemote in the renderer.

blimp/engine/renderer/blimp_remote_compositor_bridge.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 "blimp/engine/renderer/blimp_remote_compositor_bridge.h"
+
+#include "cc/blimp/compositor_proto_state.h"
+#include "cc/blimp/remote_compositor_bridge_client.h"
+#include "cc/output/swap_promise.h"
+#include "cc/proto/compositor_message.pb.h"
+
+namespace blimp {
+namespace engine {
+
+BlimpRemoteCompositorBridge::BlimpRemoteCompositorBridge(
+    cc::RemoteProtoChannel* remote_proto_channel,
+    scoped_refptr<base::SingleThreadTaskRunner> compositor_main_task_runner)
+    : RemoteCompositorBridge(std::move(compositor_main_task_runner)),
+      remote_proto_channel_(remote_proto_channel),
+      scheduler_(compositor_main_task_runner_.get(), this) {
+  DCHECK(remote_proto_channel_);
+  remote_proto_channel_->SetProtoReceiver(this);
+}
+
+BlimpRemoteCompositorBridge::~BlimpRemoteCompositorBridge() = default;
+
+void BlimpRemoteCompositorBridge::BindToClient(
+    cc::RemoteCompositorBridgeClient* client) {
+  DCHECK(!client_);
+  client_ = client;
+}
+
+void BlimpRemoteCompositorBridge::ScheduleMainFrame() {
+  scheduler_.SetNeedsMainFrame();
+}
+
+void BlimpRemoteCompositorBridge::ProcessCompositorStateUpdate(
+    std::unique_ptr<cc::CompositorProtoState> compositor_proto_state) {
+  remote_proto_channel_->SendCompositorProto(
+      *compositor_proto_state->compositor_message);
+  scheduler_.DidSendFrameUpdateToClient();
+
+  // Activate the swap promises after the frame is queued.
+  for (const auto& swap_promise : compositor_proto_state->swap_promises)
+    swap_promise->DidActivate();
+}
+
+void BlimpRemoteCompositorBridge::OnProtoReceived(
+    std::unique_ptr<cc::proto::CompositorMessage> proto) {
+  DCHECK(proto->frame_ack());
+  scheduler_.DidReceiveFrameUpdateAck();
+}
+
+void BlimpRemoteCompositorBridge::StartMainFrameUpdate() {
+  client_->BeginMainFrame();
+}
+
+}  // namespace engine
+}  // namespace blimp