Pass navigator.connect calls through to the browser process.

content/child/navigator_connect/navigator_connect_provider.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_CHILD_NAVIGATOR_CONNECT_NAVIGATOR_CONNECT_PROVIDER_H_
+#define CONTENT_CHILD_NAVIGATOR_CONNECT_NAVIGATOR_CONNECT_PROVIDER_H_
+
+#include "base/compiler_specific.h"
+#include "base/id_map.h"
+#include "base/memory/ref_counted.h"
+#include "content/child/worker_task_runner.h"
+#include "third_party/WebKit/public/platform/WebNavigatorConnectProvider.h"
+
+class GURL;
+
+namespace blink {
+template <typename T1, typename T2>
+class WebCallbacks;
+class WebMessagePortChannel;
+class WebString;
+}
+
+namespace IPC {
+class Message;
+}
+
+namespace content {
+class ThreadSafeSender;
+
+// Main entry point for the navigator.connect API in a child process. This
+// implements the blink API and passes connect calls on to the browser process.
+// NavigatorConnectDispatcher receives IPCs from the browser process and passes
+// them on to the correct thread specific instance of this class.
+// The ThreadSpecificInstance method will return an instance of this class for
+// the current thread, or create one if no instance exists yet for this thread.
+// This class deletes itself if the worker thread it belongs to quits.
+class NavigatorConnectProvider : public blink::WebNavigatorConnectProvider,
+                                 public WorkerTaskRunner::Observer {
+ public:
+  explicit NavigatorConnectProvider(ThreadSafeSender* thread_safe_sender);
+  ~NavigatorConnectProvider();
+
+  // WebNavigatorConnectProvider implementation.
+  virtual void connect(const blink::WebURL& targetUrl,
+                       blink::WebMessagePortChannel* port,
+                       blink::WebCallbacks<void, void>* callbacks);
+
+  void OnMessageReceived(const IPC::Message& msg);
+
+  // |thread_safe_sender| needs to be passed in because if the call leads to
+  // construction it will be needed.
+  static NavigatorConnectProvider* ThreadSpecificInstance(
+      ThreadSafeSender* thread_safe_sender);
+
+ private:
+  void OnConnectResult(int thread_id, int request_id, bool allow_connect);
+
+  // WorkerTaskRunner::Observer implementation.
+  void OnWorkerRunLoopStopped() override;
+
+  scoped_refptr<ThreadSafeSender> thread_safe_sender_;
+  typedef blink::WebCallbacks<void, void> ConnectCallback;
+  IDMap<ConnectCallback> requests_;
+
+  DISALLOW_COPY_AND_ASSIGN(NavigatorConnectProvider);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_CHILD_NAVIGATOR_CONNECT_NAVIGATOR_CONNECT_PROVIDER_H_