cc:: Add remote mode to the compositor

cc/trees/remote_channel_impl.cc

Index: cc/trees/remote_channel_impl.cc
diff --git a/cc/trees/remote_channel_impl.cc b/cc/trees/remote_channel_impl.cc
new file mode 100644
index 0000000000000000000000000000000000000000..78454a6e99e756088bb2682187c4d4e279b6f2b7
--- /dev/null
+++ b/cc/trees/remote_channel_impl.cc
@@ -0,0 +1,220 @@
+// 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/remote_channel_impl.h"
+
+#include "base/bind_helpers.h"
+#include "base/single_thread_task_runner.h"
+#include "cc/proto/compositor_message.pb.h"
+#include "cc/proto/compositor_message_to_impl.pb.h"
+#include "cc/proto/compositor_message_to_main.pb.h"
+#include "cc/trees/layer_tree_host.h"
+#include "cc/trees/layer_tree_settings.h"
+
+namespace cc {
+
+scoped_ptr<RemoteChannelImpl> RemoteChannelImpl::Create(
+    RemoteChannelHost* remote_channel_host,
+    TaskGraphRunner* task_graph_runner,
+    const LayerTreeSettings& settings,
+    scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
+    scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner) {
+  return make_scoped_ptr(
+      new RemoteChannelImpl(remote_channel_host, task_graph_runner, settings,
+                            main_task_runner, impl_task_runner));
+}
+
+RemoteChannelImpl::RemoteChannelImpl(
+    RemoteChannelHost* remote_channel_host,
+    TaskGraphRunner* task_graph_runner,
+    const LayerTreeSettings& settings,
+    scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
+    scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner)
+    : main_thread_vars_unsafe_(this,
+                               remote_channel_host,
+                               task_graph_runner,
+                               settings,
+                               main_task_runner,
+                               impl_task_runner) {
+  DCHECK(task_runner_provider_->IsMainThread());
+}
+
+RemoteChannelImpl::~RemoteChannelImpl() {
+  DCHECK(task_runner_provider_->IsMainThread());
+  {
+    CompletionEvent completion;
+    DebugScopedSetMainThreadBlocked main_thread_blocked(task_runner_provider_);
+    ImplThreadTaskRunner()->PostTask(
+        FROM_HERE, base::Bind(&ProxyImpl::FinishGLOnImpl, proxy_impl_weak_ptr_,
+                              &completion));
+    completion.Wait();
+  }
+  {
+    CompletionEvent completion;
+    DebugScopedSetMainThreadBlocked main_thread_blocked(task_runner_provider_);
+    ImplThreadTaskRunner()->PostTask(
+        FROM_HERE, base::Bind(&RemoteChannelImpl::ShutdownImplOnImpl,
+                              base::Unretained(this), &completion));
+    completion.Wait();
+  }
+}
+
+void RemoteChannelImpl::HandleProto(
+    const proto::CompositorMessageToImpl& proto) {
+  DCHECK(task_runner_provider_->IsMainThread());
+  switch (proto.message_type()) {
+    case proto::CompositorMessageToImpl::MainThreadHasStoppedFlingingOnImpl:
+      MainThreadHasStoppedFlinging();
+      break;
+    default:
+      // TODO(khushalsagar): Add more types here.
+      NOTIMPLEMENTED();
+  }
+}
+
+scoped_ptr<ProxyImpl> RemoteChannelImpl::CreateProxyImpl(
+    ChannelImpl* channel_impl,
+    LayerTreeHost* layer_tree_host,
+    TaskRunnerProvider* task_runner_provider,
+    scoped_ptr<BeginFrameSource> external_begin_frame_source) {
+  DCHECK(false);

[David Trainor- moved to gerrit, 2015/12/11 17:13:44]

Remove?

[Khushal, 2015/12/11 22:49:37]

Woops. Debugging fun. :P

+  DCHECK(task_runner_provider_->IsImplThread());
+  return ProxyImpl::Create(channel_impl, layer_tree_host, task_runner_provider,
+                           std::move(external_begin_frame_source));
+}
+
+bool RemoteChannelImpl::MainFrameWillHappenForTesting() {
+  DCHECK(task_runner_provider_->IsMainThread());
+  bool main_frame_will_happen;
+  {
+    CompletionEvent completion;
+    DebugScopedSetMainThreadBlocked main_thread_blocked(task_runner_provider_);
+    ImplThreadTaskRunner()->PostTask(
+        FROM_HERE,
+        base::Bind(&ProxyImpl::MainFrameWillHappenOnImplForTesting,
+                   proxy_impl_weak_ptr_, &completion, &main_frame_will_happen));
+    completion.Wait();
+  }
+  return main_frame_will_happen;
+}
+
+void RemoteChannelImpl::Initialize() {
+  {

[David Trainor- moved to gerrit, 2015/12/11 17:13:44]

You don't need this extra scope here.  But if it's consistent style for other
CompletionEvents across CC to do this I'm fine with it.

[Khushal, 2015/12/11 22:49:37]

Done. I don't think there is any particular style to follow for this.

+    CompletionEvent completion;
+    DebugScopedSetMainThreadBlocked main_thread_blocked(task_runner_provider_);
+    ImplThreadTaskRunner()->PostTask(
+        FROM_HERE, base::Bind(&RemoteChannelImpl::InitializeImplOnImpl,
+                              base::Unretained(this), &completion,
+                              main().layer_tree_host.get()));
+    completion.Wait();
+  }
+}
+
+void RemoteChannelImpl::InitializeImplOnImpl(CompletionEvent* completion,
+                                             LayerTreeHost* layer_tree_host) {
+  DCHECK(task_runner_provider_->IsImplThread());
+  impl().proxy_impl =
+      CreateProxyImpl(this, layer_tree_host, task_runner_provider_, nullptr);
+  impl().proxy_impl_weak_factory = make_scoped_ptr(
+      new base::WeakPtrFactory<ProxyImpl>(impl().proxy_impl.get()));
+  proxy_impl_weak_ptr_ = impl().proxy_impl_weak_factory->GetWeakPtr();
+  completion->Signal();
+}
+
+void RemoteChannelImpl::ShutdownImplOnImpl(CompletionEvent* completion) {
+  DCHECK(task_runner_provider_->IsImplThread());
+
+  // We must invalidate the proxy_impl weak ptrs and destroy the weak ptr
+  // factory before destroying proxy_impl.
+  impl().proxy_impl_weak_factory->InvalidateWeakPtrs();
+  impl().proxy_impl_weak_factory.reset();
+
+  impl().proxy_impl.reset();
+  completion->Signal();
+}
+
+void RemoteChannelImpl::MainThreadHasStoppedFlinging() {
+  ImplThreadTaskRunner()->PostTask(
+      FROM_HERE, base::Bind(&ProxyImpl::MainThreadHasStoppedFlingingOnImpl,
+                            proxy_impl_weak_ptr_));
+}
+
+void RemoteChannelImpl::DidCompleteSwapBuffers() {}
+
+void RemoteChannelImpl::SetRendererCapabilitiesMainCopy(
+    const RendererCapabilities& capabilities) {}
+
+void RemoteChannelImpl::BeginMainFrameNotExpectedSoon() {}
+
+void RemoteChannelImpl::DidCommitAndDrawFrame() {}
+
+void RemoteChannelImpl::SetAnimationEvents(
+    scoped_ptr<AnimationEventsVector> queue) {}
+
+void RemoteChannelImpl::DidLoseOutputSurface() {}
+
+void RemoteChannelImpl::RequestNewOutputSurface() {}
+
+void RemoteChannelImpl::DidInitializeOutputSurface(
+    bool success,
+    const RendererCapabilities& capabilities) {}
+
+void RemoteChannelImpl::DidCompletePageScaleAnimation() {}
+
+void RemoteChannelImpl::PostFrameTimingEventsOnMain(
+    scoped_ptr<FrameTimingTracker::CompositeTimingSet> composite_events,
+    scoped_ptr<FrameTimingTracker::MainFrameTimingSet> main_frame_events) {}
+
+void RemoteChannelImpl::BeginMainFrame(
+    scoped_ptr<BeginMainFrameAndCommitState> begin_main_frame_state) {}
+
+RemoteChannelImpl::MainThreadOnly& RemoteChannelImpl::main() {
+  DCHECK(task_runner_provider_->IsMainThread());
+  return main_thread_vars_unsafe_;
+}
+
+RemoteChannelImpl::CompositorThreadOnly& RemoteChannelImpl::impl() {
+  DCHECK(task_runner_provider_->IsImplThread());
+  return compositor_thread_vars_unsafe_;
+}
+
+const RemoteChannelImpl::CompositorThreadOnly& RemoteChannelImpl::impl() const {
+  DCHECK(task_runner_provider_->IsImplThread());
+  return compositor_thread_vars_unsafe_;
+}
+
+base::SingleThreadTaskRunner* RemoteChannelImpl::MainThreadTaskRunner() const {
+  return task_runner_provider_->MainThreadTaskRunner();
+}
+
+base::SingleThreadTaskRunner* RemoteChannelImpl::ImplThreadTaskRunner() const {
+  return task_runner_provider_->ImplThreadTaskRunner();
+}
+
+RemoteChannelImpl::MainThreadOnly::MainThreadOnly(
+    RemoteChannelImpl* remote_channel_impl,
+    RemoteChannelHost* remote_channel_host,
+    TaskGraphRunner* task_graph_runner,
+    const LayerTreeSettings& settings,
+    scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
+    scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner)
+    : remote_channel_host(remote_channel_host) {
+  LayerTreeHost::InitParams params;
+  params.task_graph_runner = task_graph_runner;
+  params.main_task_runner = main_task_runner;
+  params.settings = &settings;
+  layer_tree_host =
+      LayerTreeHost::CreateDeserializable(impl_task_runner, &params);
+  remote_channel_impl->task_runner_provider_ =
+      layer_tree_host->task_runner_provider();
+}
+
+RemoteChannelImpl::MainThreadOnly::~MainThreadOnly() {}
+
+RemoteChannelImpl::CompositorThreadOnly::CompositorThreadOnly()
+    : proxy_impl(nullptr), proxy_impl_weak_factory(nullptr) {}
+
+RemoteChannelImpl::CompositorThreadOnly::~CompositorThreadOnly() {}
+
+}  // namespace cc