cc:: Add remote mode to the compositor

cc/trees/proxy_main.cc

 // Copyright 2015 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/trees/proxy_main.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/trace_event/trace_event.h"
 #include "base/trace_event/trace_event_argument.h"
 #include "base/trace_event/trace_event_synthetic_delay.h"
 #include "cc/debug/benchmark_instrumentation.h"
 #include "cc/debug/devtools_instrumentation.h"
 #include "cc/output/output_surface.h"
 #include "cc/output/swap_promise.h"
 #include "cc/trees/blocking_task_runner.h"
 #include "cc/trees/layer_tree_host.h"
+#include "cc/trees/remote_channel_main.h"
 #include "cc/trees/scoped_abort_remaining_swap_promises.h"
 #include "cc/trees/threaded_channel.h"
 
 namespace cc {
 
 scoped_ptr<ProxyMain> ProxyMain::CreateThreaded(
     LayerTreeHost* layer_tree_host,
     TaskRunnerProvider* task_runner_provider) {
   scoped_ptr<ProxyMain> proxy_main(
       new ProxyMain(layer_tree_host, task_runner_provider));
   proxy_main->SetChannel(
       ThreadedChannel::Create(proxy_main.get(), task_runner_provider));
   return proxy_main;
 }
 
+scoped_ptr<ProxyMain> ProxyMain::CreateRemote(
+    RemoteProtoChannel* remote_proto_channel,
+    LayerTreeHost* layer_tree_host,
+    TaskRunnerProvider* task_runner_provider) {
+  scoped_ptr<ProxyMain> proxy_main(
+      new ProxyMain(layer_tree_host, task_runner_provider));
+  proxy_main->SetChannel(RemoteChannelMain::Create(
+      remote_proto_channel, proxy_main.get(), task_runner_provider));
+  return proxy_main;
+}
+
 ProxyMain::ProxyMain(LayerTreeHost* layer_tree_host,
                      TaskRunnerProvider* task_runner_provider)
     : layer_tree_host_(layer_tree_host),
       task_runner_provider_(task_runner_provider),
       layer_tree_host_id_(layer_tree_host->id()),
       max_requested_pipeline_stage_(NO_PIPELINE_STAGE),
       current_pipeline_stage_(NO_PIPELINE_STAGE),
       final_pipeline_stage_(NO_PIPELINE_STAGE),
       commit_waits_for_activation_(false),
       started_(false),
@@ skipping 326 matching lines @@
 }
 
 void ProxyMain::MainThreadHasStoppedFlinging() {
   DCHECK(IsMainThread());
   channel_main_->MainThreadHasStoppedFlingingOnImpl();
 }
 
 void ProxyMain::Start(
     scoped_ptr<BeginFrameSource> external_begin_frame_source) {
   DCHECK(IsMainThread());
-  DCHECK(task_runner_provider_->HasImplThread());

[vmpstr, 2016/01/11 21:50:15]

Should this be 

DCHECK(!external_begin_frame_source || task_runner_provider_->HasImplThread()) 

instead?

[Khushal, 2016/01/13 02:07:12]

If the client does not use the external begin frame source then we'll not have
this DCHECK.
We could either make the IsThreaded() or IsRemoteServer() methods public on the
LayerTreeHost?

[ericrk, 2016/01/20 22:32:28]

Seems like we could use IsRemoteServer a few places - I'm not too opposed to
making this public.

[Khushal, 2016/01/22 01:03:24]

Done.

   DCHECK(channel_main_);
   DCHECK(!layer_tree_host_->settings().use_external_begin_frame_source ||
          external_begin_frame_source);
 
   // Create LayerTreeHostImpl.
   channel_main_->SynchronouslyInitializeImpl(
       layer_tree_host_, std::move(external_begin_frame_source));
 
   started_ = true;
 }
@@ skipping 62 matching lines @@
     return false;
   channel_main_->SetNeedsCommitOnImpl();
   return true;
 }
 
 bool ProxyMain::IsMainThread() const {
   return task_runner_provider_->IsMainThread();
 }
 
 }  // namespace cc