Terminate the ViewManagerInit app when its binding has a connection error.

This is split off https://codereview.chromium.org/1139673003

BUG=484234

Review URL: https://codereview.chromium.org/1142083002

Cr-Commit-Position: refs/heads/master@{#330382}

components/view_manager/public/cpp/lib/view_manager_init.cc

@@ -35,6 +35,7 @@ ViewManagerInit::ViewManagerInit(ApplicationImpl* app,
       app_->ConnectToApplication("mojo:view_manager");
   connection->AddService(client_factory_.get());
   connection->ConnectToService(&service_);
+  service_.set_error_handler(this);
   connection->ConnectToService(&view_manager_root_);
   if (root_client) {
     root_client_binding_.reset(new Binding<ViewManagerRootClient>(root_client));
@@ -55,4 +56,8 @@ void ViewManagerInit::OnCreate(InterfaceRequest<ViewManagerClient> request) {
   client->SetViewManagerService(service_.Pass());
 }
 
+void ViewManagerInit::OnConnectionError() {
+  mojo::ApplicationImpl::Terminate();
+}
+
 }  // namespace mojo

components/view_manager/public/cpp/view_manager_init.h

@@ -10,6 +10,8 @@
 #include "components/view_manager/public/interfaces/view_manager.mojom.h"
 #include "components/view_manager/public/interfaces/view_manager_root.mojom.h"
 #include "third_party/mojo/src/mojo/public/cpp/bindings/binding.h"
+#include "third_party/mojo/src/mojo/public/cpp/bindings/error_handler.h"
+
 namespace mojo {
 
 class ApplicationImpl;
@@ -18,13 +20,13 @@ class ViewManagerDelegate;
 // ViewManagerInit is used to establish the initial connection to the
 // ViewManager. Use it when you know the ViewManager is not running and you're
 // app is going to be the first one to contact it.
-class ViewManagerInit {
+class ViewManagerInit : public mojo::ErrorHandler {
  public:
   // |root_client| is optional.
   ViewManagerInit(ApplicationImpl* app,
                   ViewManagerDelegate* delegate,
                   ViewManagerRootClient* root_client);
-  ~ViewManagerInit();
+  ~ViewManagerInit() override;
 
   // Returns the ViewManagerRoot. This is only valid if |root_client| was
   // supplied to the constructor.
@@ -35,6 +37,9 @@ class ViewManagerInit {
 
   void OnCreate(InterfaceRequest<ViewManagerClient> request);
 
+  // ErrorHandler:
+  void OnConnectionError() override;
+
   ApplicationImpl* app_;
   ViewManagerDelegate* delegate_;
   scoped_ptr<ClientFactory> client_factory_;