First cut at "content handling" support in Mojo.

mojo/shell/ui_service_loader_android.cc

 // 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.
 
 #include "mojo/shell/ui_service_loader_android.h"
 
 #include "base/bind.h"
 #include "mojo/service_manager/service_manager.h"
 #include "mojo/shell/context.h"
 
 namespace mojo {
 
 class UIServiceLoader::UILoader {
  public:
   explicit UILoader(ServiceLoader* loader) : loader_(loader) {}
   ~UILoader() {}
 
   void LoadService(ServiceManager* manager,
                    const GURL& url,
                    ScopedMessagePipeHandle shell_handle) {
-    loader_->LoadService(manager, url, shell_handle.Pass());
+    scoped_refptr<LoadServiceCallbacks> callbacks(
+        new ServiceLoader::SimpleLoadServiceCallbacks(shell_handle.Pass()));
+    loader_->LoadService(manager, url, callbacks);
   }
 
   void OnServiceError(ServiceManager* manager, const GURL& url) {
     loader_->OnServiceError(manager, url);
   }
 
  private:
   ServiceLoader* loader_;  // Owned by UIServiceLoader
 
   DISALLOW_COPY_AND_ASSIGN(UILoader);
 };
 
 UIServiceLoader::UIServiceLoader(scoped_ptr<ServiceLoader> real_loader,
                                  shell::Context* context)
     : loader_(real_loader.Pass()), context_(context) {
 }
 
 UIServiceLoader::~UIServiceLoader() {
   context_->ui_loop()->PostTask(
       FROM_HERE,
       base::Bind(&UIServiceLoader::ShutdownOnUIThread, base::Unretained(this)));
 }
 
-void UIServiceLoader::LoadService(ServiceManager* manager,
-                                  const GURL& url,
-                                  ScopedMessagePipeHandle shell_handle) {
+void UIServiceLoader::LoadService(
+    ServiceManager* manager,
+    const GURL& url,
+    scoped_refptr<LoadServiceCallbacks> callbacks) {
+  ScopedMessagePipeHandle shell_handle = callbacks->RegisterApplication();
+  if (!shell_handle.is_valid())
+    return;
   context_->ui_loop()->PostTask(
       FROM_HERE,
       base::Bind(
           &UIServiceLoader::LoadServiceOnUIThread,
           base::Unretained(this),
           manager,
           url,
-          base::Owned(new ScopedMessagePipeHandle(shell_handle.Pass()))));
+          shell_handle.Pass()));
 }
 
 void UIServiceLoader::OnServiceError(ServiceManager* manager, const GURL& url) {
   context_->ui_loop()->PostTask(
       FROM_HERE,
       base::Bind(&UIServiceLoader::OnServiceErrorOnUIThread,
                  base::Unretained(this),
                  manager,
                  url));
 }
 
 void UIServiceLoader::LoadServiceOnUIThread(
     ServiceManager* manager,
     const GURL& url,
-    ScopedMessagePipeHandle* shell_handle) {
+    ScopedMessagePipeHandle shell_handle) {
   if (!ui_loader_)
     ui_loader_ = new UILoader(loader_.get());
-  ui_loader_->LoadService(manager, url, shell_handle->Pass());
+  ui_loader_->LoadService(manager, url, shell_handle.Pass());
 }
 
 void UIServiceLoader::OnServiceErrorOnUIThread(ServiceManager* manager,
                                                const GURL& url) {
   if (!ui_loader_)
     ui_loader_ = new UILoader(loader_.get());
   ui_loader_->OnServiceError(manager, url);
 }
 
 void UIServiceLoader::ShutdownOnUIThread() {
   delete ui_loader_;
   // Destroy |loader_| on the thread it's actually used on.
   loader_.reset();
 }
 
 }  // namespace mojo