Support exposing Mojo services between render frames, render threads, and their respective hosts.

content/browser/mojo/mojo_application_host.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 CONTENT_BROWSER_MOJO_MOJO_APPLICATION_HOST_H_
 #define CONTENT_BROWSER_MOJO_MOJO_APPLICATION_HOST_H_
 
 #include "base/process/process_handle.h"
 #include "mojo/common/channel_init.h"
 #include "mojo/embedder/scoped_platform_handle.h"
 #include "mojo/public/interfaces/service_provider/service_provider.mojom.h"
 
 namespace IPC {
 class Sender;
 }
 
 namespace content {
 
 // MojoApplicationHost represents the code needed on the browser side to setup
 // a child process as a Mojo application via Chrome IPC. The child process
 // should use MojoApplication to handle messages generated by an instance of
 // MojoApplicationHost. MojoApplicationHost makes the mojo::ShellClient
 // interface available so that child-provided services can be invoked.
 class MojoApplicationHost {
  public:
   MojoApplicationHost();
   virtual ~MojoApplicationHost();
 
   // Two-phase initialization:
-  //  1- Init makes the shell_client() available synchronously.
+  //  1- Init makes |shell_handle| available synchronously.
   //  2- Activate establishes the actual connection to the peer process.
-  bool Init();
+  bool Init(mojo::ScopedMessagePipeHandle* shell_handle);
   bool Activate(IPC::Sender* sender, base::ProcessHandle process_handle);
 
   bool did_activate() const { return did_activate_; }
 
-  mojo::ServiceProvider* service_provider() {
-    DCHECK(child_service_provider_.get());
-    return child_service_provider_->client();
-  }
-
  private:
-  class ServiceProviderImpl
-      : public mojo::InterfaceImpl<mojo::ServiceProvider> {
-   public:
-    virtual void OnConnectionError() OVERRIDE {
-      // TODO(darin): How should we handle this error?
-    }
-
-    // mojo::ServiceProvider methods:
-    virtual void ConnectToService(
-        const mojo::String& service_url,
-        const mojo::String& service_name,
-        mojo::ScopedMessagePipeHandle handle,
-        const mojo::String& requestor_url) OVERRIDE;
-  };
-
   mojo::common::ChannelInit channel_init_;
   mojo::embedder::ScopedPlatformHandle client_handle_;
 
-  scoped_ptr<ServiceProviderImpl> child_service_provider_;
-
   bool did_activate_;
 
   DISALLOW_COPY_AND_ASSIGN(MojoApplicationHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_MOJO_MOJO_APPLICATION_HOST_H_