Pass the final URL an app was loaded from to the app in Initialize().

mojo/public/cpp/application/application_impl.h

 // Copyright 2014 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.
 
 #ifndef MOJO_PUBLIC_APPLICATION_APPLICATION_IMPL_H_
 #define MOJO_PUBLIC_APPLICATION_APPLICATION_IMPL_H_
 #include <vector>
 
 #include "mojo/public/cpp/application/application_connection.h"
 #include "mojo/public/cpp/application/lib/service_connector.h"
@@ skipping 40 matching lines @@
 //
 //
 class ApplicationImpl : public Application {
  public:
   ApplicationImpl(ApplicationDelegate* delegate,
                   InterfaceRequest<Application> request);
   ~ApplicationImpl() override;
 
   Shell* shell() const { return shell_.get(); }
 
+  const std::string& url() const { return url_; }
+
   // Returns any initial configuration arguments, passed by the Shell.
   const std::vector<std::string>& args() const { return args_; }
   bool HasArg(const std::string& arg) const;
 
   // Establishes a new connection to an application. Caller does not own.
   ApplicationConnection* ConnectToApplication(const String& application_url);
 
   // Connect to application identified by |application_url| and connect to the
   // service implementation of the interface identified by |Interface|.
   template <typename Interface>
   void ConnectToService(const std::string& application_url,
                         InterfacePtr<Interface>* ptr) {
     ConnectToApplication(application_url)->ConnectToService(ptr);
   }
 
   // Application implementation.
-  void Initialize(ShellPtr shell, Array<String> args) override;
+  void Initialize(ShellPtr shell,
+                  Array<String> args,
+                  const mojo::String& url) override;
 
   // Block until the Application is initialized, if it is not already.
   void WaitForInitialize();
 
   // Unbinds the Shell and Application connections. Can be used to re-bind the
   // handles to another implementation of ApplicationImpl, for instance when
   // running apptests.
   void UnbindConnections(InterfaceRequest<Application>* application_request,
                          ShellPtr* shell);
 
@@ skipping 18 matching lines @@
   void RequestQuit() override;
 
   typedef std::vector<internal::ServiceRegistry*> ServiceRegistryList;
 
   ServiceRegistryList incoming_service_registries_;
   ServiceRegistryList outgoing_service_registries_;
   ApplicationDelegate* delegate_;
   Binding<Application> binding_;
   ShellPtr shell_;
   ShellPtrWatcher* shell_watch_;
+  std::string url_;
   std::vector<std::string> args_;
 
   MOJO_DISALLOW_COPY_AND_ASSIGN(ApplicationImpl);
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_APPLICATION_APPLICATION_IMPL_H_