Add support for PA_SERVICE_REQUEST (#3746)

This patch adds support for the new way of exposing services from applications.

content_handler/BUILD.gn

@@ -42,6 +42,7 @@ template("flutter_content_handler") {
 
     deps = [
       "//application/lib/app",
+      "//application/lib/svc",
       "//apps/icu_data/lib",
       "//apps/mozart/lib/flutter/sdk_ext",
       "//apps/mozart/lib/skia:vmo",

content_handler/application_controller_impl.cc

@@ -38,15 +38,29 @@ ApplicationControllerImpl::ApplicationControllerImpl(
   // startup handles.
 
   if (startup_info->launch_info->services) {
-    service_provider_bindings_.AddBinding(
-        this, std::move(startup_info->launch_info->services));
+    service_provider_bridge_.AddBinding(
+        std::move(startup_info->launch_info->services));
   }
 
+  if (startup_info->launch_info->service_request.is_valid()) {
+    service_provider_bridge_.ServeDirectory(
+        std::move(startup_info->launch_info->service_request));
+  }
+
+  service_provider_bridge_.AddService<mozart::ViewProvider>(
+      [this](fidl::InterfaceRequest<mozart::ViewProvider> request) {
+    view_provider_bindings_.AddBinding(this, std::move(request));
+  });
+
+  app::ServiceProviderPtr service_provider;
+  auto request = service_provider.NewRequest();
+  service_provider_bridge_.set_backend(std::move(service_provider));
+
   url_ = startup_info->launch_info->url;
   runtime_holder_.reset(new RuntimeHolder());
   runtime_holder_->Init(
       app::ApplicationContext::CreateFrom(std::move(startup_info)),
-      fidl::GetProxy(&dart_service_provider_), std::move(bundle));
+      std::move(request), std::move(bundle));
 }
 
 ApplicationControllerImpl::~ApplicationControllerImpl() = default;
@@ -61,17 +75,6 @@ void ApplicationControllerImpl::Detach() {
   binding_.set_connection_error_handler(ftl::Closure());
 }
 
-void ApplicationControllerImpl::ConnectToService(
-    const fidl::String& service_name,
-    mx::channel channel) {
-  if (service_name == mozart::ViewProvider::Name_) {
-    view_provider_bindings_.AddBinding(
-        this, fidl::InterfaceRequest<mozart::ViewProvider>(std::move(channel)));
-  } else {
-    dart_service_provider_->ConnectToService(service_name, std::move(channel));
-  }
-}
-
 void ApplicationControllerImpl::CreateView(
     fidl::InterfaceRequest<mozart::ViewOwner> view_owner_request,
     fidl::InterfaceRequest<app::ServiceProvider> services) {

content_handler/application_controller_impl.h

@@ -7,6 +7,7 @@
 
 #include <memory>
 
+#include "application/lib/svc/service_provider_bridge.h"
 #include "application/services/application_controller.fidl.h"
 #include "application/services/application_runner.fidl.h"
 #include "application/services/service_provider.fidl.h"
@@ -22,7 +23,6 @@ class App;
 class RuntimeHolder;
 
 class ApplicationControllerImpl : public app::ApplicationController,
-                                  public app::ServiceProvider,
                                   public mozart::ViewProvider {
  public:
   ApplicationControllerImpl(
@@ -38,11 +38,6 @@ class ApplicationControllerImpl : public app::ApplicationController,
   void Kill() override;
   void Detach() override;
 
-  // |app::ServiceProvider| implementation
-
-  void ConnectToService(const fidl::String& service_name,
-                        mx::channel channel) override;
-
   // |mozart::ViewProvider| implementation
 
   void CreateView(
@@ -58,8 +53,7 @@ class ApplicationControllerImpl : public app::ApplicationController,
   App* app_;
   fidl::Binding<app::ApplicationController> binding_;
 
-  fidl::BindingSet<app::ServiceProvider> service_provider_bindings_;
-  app::ServiceProviderPtr dart_service_provider_;
+  app::ServiceProviderBridge service_provider_bridge_;
 
   fidl::BindingSet<mozart::ViewProvider> view_provider_bindings_;