mus: Reconnect to gpu process when it dies.

services/ui/ws/gpu_service_proxy.cc

Index: services/ui/ws/gpu_service_proxy.cc
diff --git a/services/ui/ws/gpu_service_proxy.cc b/services/ui/ws/gpu_service_proxy.cc
index d5815458845b42e44dff7f38b60c355b79bbedef..ec24addb8e86db7f1dfcfd731e2ba11b38f764a1 100644
--- a/services/ui/ws/gpu_service_proxy.cc
+++ b/services/ui/ws/gpu_service_proxy.cc
@@ -43,6 +43,10 @@ class GpuServiceImpl : public mojom::GpuService {
   }
   ~GpuServiceImpl() override {}
 
+  void reset_gpu_service_internal(mojom::GpuServiceInternal* connection) {
+    gpu_service_internal_ = connection;
+  }
+
  private:
   void OnGpuChannelEstablished(const EstablishGpuChannelCallback& callback,
                                mojo::ScopedMessagePipeHandle channel_handle) {
@@ -101,6 +105,9 @@ GpuServiceProxy::GpuServiceProxy(GpuServiceProxyDelegate* delegate)
   // TODO(sad): Once GPU process is split, this would look like:
   //   connector->ConnectToInterface("gpu", &gpu_service_);
   gpu_main_.Create(GetProxy(&gpu_service_));
+  gpu_service_.set_connection_error_handler(
+      base::Bind(&GpuServiceProxy::OnGpuConnectionGone,
+                 base::Unretained(this)));
   gpu_service_->Initialize(
       base::Bind(&GpuServiceProxy::OnInitialized, base::Unretained(this)));
   gpu_memory_buffer_manager_ = base::MakeUnique<MusGpuMemoryBufferManager>(
@@ -111,11 +118,11 @@ GpuServiceProxy::~GpuServiceProxy() {
 }
 
 void GpuServiceProxy::Add(mojom::GpuServiceRequest request) {
-  mojo::MakeStrongBinding(
+  clients_.push_back(mojo::MakeStrongBinding(
       base::MakeUnique<GpuServiceImpl>(next_client_id_++, &gpu_info_,
                                        gpu_memory_buffer_manager_.get(),
                                        gpu_service_.get()),
-      std::move(request));
+      std::move(request)));
 }
 
 void GpuServiceProxy::CreateDisplayCompositor(
@@ -129,5 +136,18 @@ void GpuServiceProxy::OnInitialized(const gpu::GPUInfo& gpu_info) {
   delegate_->OnGpuServiceInitialized();
 }
 
+void GpuServiceProxy::OnGpuConnectionGone() {
+  // TODO(sad): Once GPU process is split, this would look like:
+  //   connector->ConnectToInterface("gpu", &gpu_service_);
+  gpu_main_.Create(GetProxy(&gpu_service_));
+  gpu_service_.set_connection_error_handler(
+      base::Bind(&GpuServiceProxy::OnGpuConnectionGone,
+                 base::Unretained(this)));
+  for (auto& weak_ptr : clients_) {
+    GpuServiceImpl* client = static_cast<GpuServiceImpl*>(weak_ptr->impl());
+    client->reset_gpu_service_internal(gpu_service_.get());
+  }
+}
+
 }  // namespace ws
 }  // namespace ui