Create MetroViewerProcessHost as a common base for TestMetroViewerProcessHost and ChromeMetroViewer…

win8/viewer/metro_viewer_process_host.h

Index: win8/viewer/metro_viewer_process_host.h
diff --git a/win8/viewer/metro_viewer_process_host.h b/win8/viewer/metro_viewer_process_host.h
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+// Copyright (c) 2013 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 WIN8_VIEWER_METRO_VIEWER_PROCESS_HOST_H_
+#define WIN8_VIEWER_METRO_VIEWER_PROCESS_HOST_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/string16.h"
+#include "base/threading/non_thread_safe.h"
+#include "ipc/ipc_channel_proxy.h"
+#include "ipc/ipc_listener.h"
+#include "ipc/ipc_sender.h"
+#include "ui/gfx/native_widget_types.h"
+
+namespace base {
+class SingleThreadTaskRunner;
+class WaitableEvent;
+}
+
+namespace IPC {
+class Message;
+}
+
+namespace win8 {
+
+// Abstract base class for various Metro viewer process host implementations.
+class MetroViewerProcessHost : public IPC::Listener,
+                               public IPC::Sender,
+                               public base::NonThreadSafe {
+ public:
+  // Initializes a viewer process host over |ipc_channel_name|. The given task
+  // runner correspond to a thread on which IPC::Channel is created and used
+  // (e.g. IO thread). Instantly connects to the viewer process if one is
+  // already connected to |ipc_channel_name|; a viewer can otherwise be
+  // launched synchronously via LaunchViewerAndWaitForConnection().
+  MetroViewerProcessHost(const std::string& ipc_channel_name,
+                         base::SingleThreadTaskRunner* ipc_task_runner);
+  virtual ~MetroViewerProcessHost();
+
+  // Returns the process id of the viewer process if one is connected to this
+  // host, returns base::kNullProcessId otherwise.
+  base::ProcessId GetViewerProcessId();
+
+  // Launches the viewer process associated with the given |app_user_model_id|
+  // and blocks until that viewer process connects or until a timeout is
+  // reached. Returns true if the viewer process connects before the timeout is
+  // reached. NOTE: this assumes that the app referred to by |app_user_model_id|
+  // is registered as the default browser.
+  bool LaunchViewerAndWaitForConnection(
+      const base::string16& app_user_model_id);
+
+ private:
+  // IPC::Sender implementation:
+  virtual bool Send(IPC::Message* msg) OVERRIDE;
+
+  // IPC::Listener implementation:
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
+  virtual void OnChannelError() OVERRIDE = 0;
+
+  // Called over IPC by the viewer process to tell this host that it should be
+  // drawing to |target_surface|.
+  virtual void OnSetTargetSurface(gfx::NativeViewId target_surface) = 0;
+
+  void NotifyChannelConnected();
+
+  // Inner message filter used to handle connection event on the IPC channel
+  // proxy's background thread. This prevents consumers of
+  // MetroViewerProcessHost from having to pump messages on their own message
+  // loop.
+  class InternalMessageFilter : public IPC::ChannelProxy::MessageFilter {
+   public:
+    InternalMessageFilter(MetroViewerProcessHost* owner);
+
+    // IPC::ChannelProxy::MessageFilter implementation.
+    virtual void OnChannelConnected(int32 peer_pid) OVERRIDE;
+
+   private:
+    MetroViewerProcessHost* owner_;
+    DISALLOW_COPY_AND_ASSIGN(InternalMessageFilter);
+  };
+
+  scoped_ptr<IPC::ChannelProxy> channel_;
+  scoped_ptr<base::WaitableEvent> channel_connected_event_;
+
+  DISALLOW_COPY_AND_ASSIGN(MetroViewerProcessHost);
+};
+
+}  // namespace win8
+
+#endif  // WIN8_VIEWER_METRO_VIEWER_PROCESS_HOST_H_