diff --git a/mojo/application_manager/application_manager.h b/mojo/application_manager/application_manager.h
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+++ b/mojo/application_manager/application_manager.h
@@ -0,0 +1,163 @@
+// 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_APPLICATION_MANAGER_APPLICATION_MANAGER_H_
+#define MOJO_APPLICATION_MANAGER_APPLICATION_MANAGER_H_
+
+#include <map>
+
+#include "base/basictypes.h"
+#include "base/gtest_prod_util.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "mojo/application_manager/application_loader.h"
+#include "mojo/application_manager/application_manager_export.h"
+#include "mojo/public/interfaces/application/service_provider.mojom.h"
+#include "url/gurl.h"
+
+namespace mojo {
+
+class MOJO_APPLICATION_MANAGER_EXPORT ApplicationManager {
+ public:
+  class MOJO_APPLICATION_MANAGER_EXPORT Delegate {
+   public:
+    virtual ~Delegate();
+    // Send when the Application holding the handle on the other end of the
+    // Shell pipe goes away.
+    virtual void OnApplicationError(const GURL& url) = 0;
+  };
+
+  // API for testing.
+  class MOJO_APPLICATION_MANAGER_EXPORT TestAPI {
+   public:
+    explicit TestAPI(ApplicationManager* manager);
+    ~TestAPI();
+
+    // Returns true if the shared instance has been created.
+    static bool HasCreatedInstance();
+    // Returns true if there is a ShellImpl for this URL.
+    bool HasFactoryForURL(const GURL& url) const;
+
+   private:
+    ApplicationManager* manager_;
+
+    DISALLOW_COPY_AND_ASSIGN(TestAPI);
+  };
+
+  // Interface class for debugging only.
+  class Interceptor {
+   public:
+    virtual ~Interceptor() {}
+    // Called when ApplicationManager::Connect is called.
+    virtual ServiceProviderPtr OnConnectToClient(
+        const GURL& url,
+        ServiceProviderPtr service_provider) = 0;
+  };
+
+  ApplicationManager();
+  ~ApplicationManager();
+
+  // Returns a shared instance, creating it if necessary.
+  static ApplicationManager* GetInstance();
+
+  void SetDelegate(Delegate* delegate) { delegate_ = delegate; }
+
+  // Loads a service if necessary and establishes a new client connection.
+  void ConnectToApplication(const GURL& application_url,
+                            const GURL& requestor_url,
+                            ServiceProviderPtr service_provider);
+
+  template <typename Interface>
+  inline void ConnectToService(const GURL& application_url,
+                               InterfacePtr<Interface>* ptr) {
+    ScopedMessagePipeHandle service_handle =
+        ConnectToServiceByName(application_url, Interface::Name_);
+    ptr->Bind(service_handle.Pass());
+  }
+
+  ScopedMessagePipeHandle ConnectToServiceByName(
+      const GURL& application_url,
+      const std::string& interface_name);
+
+  void RegisterExternalApplication(const GURL& application_url,
+                                   ScopedMessagePipeHandle shell);
+
+  void set_delegate(Delegate* delegate) { delegate_ = delegate; }
+
+  // Sets the default Loader to be used if not overridden by SetLoaderForURL()
+  // or SetLoaderForScheme().
+  void set_default_loader(scoped_ptr<ApplicationLoader> loader) {
+    default_loader_ = loader.Pass();
+  }
+  // Sets a Loader to be used for a specific url.
+  void SetLoaderForURL(scoped_ptr<ApplicationLoader> loader, const GURL& url);
+  // Sets a Loader to be used for a specific url scheme.
+  void SetLoaderForScheme(scoped_ptr<ApplicationLoader> loader,
+                          const std::string& scheme);
+  // These strings will be passed to the Initialize() method when an
+  // Application is instantiated.
+  void SetArgsForURL(const std::vector<std::string>& args, const GURL& url);
+
+  // Allows to interpose a debugger to service connections.
+  void SetInterceptor(Interceptor* interceptor);
+
+  // Destroys all Shell-ends of connections established with Applications.
+  // Applications connected by this ApplicationManager will observe pipe errors
+  // and have a chance to shutdown.
+  void TerminateShellConnections();
+
+ private:
+  struct ContentHandlerConnection;
+  class LoadCallbacksImpl;
+  class ShellImpl;
+
+  typedef std::map<std::string, ApplicationLoader*> SchemeToLoaderMap;
+  typedef std::map<GURL, ApplicationLoader*> URLToLoaderMap;
+  typedef std::map<GURL, ShellImpl*> URLToShellImplMap;
+  typedef std::map<GURL, ContentHandlerConnection*> URLToContentHandlerMap;
+  typedef std::map<GURL, std::vector<std::string> > URLToArgsMap;
+
+  void ConnectToClient(ShellImpl* shell_impl,
+                       const GURL& url,
+                       const GURL& requestor_url,
+                       ServiceProviderPtr service_provider);
+
+  void RegisterLoadedApplication(const GURL& service_url,
+                                 const GURL& requestor_url,
+                                 ServiceProviderPtr service_provider,
+                                 ScopedMessagePipeHandle* shell_handle);
+
+  void LoadWithContentHandler(const GURL& content_url,
+                              const GURL& requestor_url,
+                              const GURL& content_handler_url,
+                              URLResponsePtr url_response,
+                              ServiceProviderPtr service_provider);
+
+  // Returns the Loader to use for a url (using default if not overridden.)
+  // The preference is to use a loader that's been specified for an url first,
+  // then one that's been specified for a scheme, then the default.
+  ApplicationLoader* GetLoaderForURL(const GURL& url);
+
+  // Removes a ShellImpl when it encounters an error.
+  void OnShellImplError(ShellImpl* shell_impl);
+
+  Delegate* delegate_;
+  // Loader management.
+  URLToLoaderMap url_to_loader_;
+  SchemeToLoaderMap scheme_to_loader_;
+  scoped_ptr<ApplicationLoader> default_loader_;
+  Interceptor* interceptor_;
+
+  URLToShellImplMap url_to_shell_impl_;
+  URLToContentHandlerMap url_to_content_handler_;
+  URLToArgsMap url_to_args_;
+
+  base::WeakPtrFactory<ApplicationManager> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(ApplicationManager);
+};
+
+}  // namespace mojo
+
+#endif  // MOJO_APPLICATION_MANAGER_APPLICATION_MANAGER_H_