Adding Wayland message loop and gyp build deps

base/message_pump_wayland.h

+// Copyright (c) 2011 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 BASE_MESSAGE_PUMP_WAYLAND_H_
+#define BASE_MESSAGE_PUMP_WAYLAND_H_
+#pragma once
+
+#include "base/memory/scoped_ptr.h"
+#include "base/message_pump_glib.h"
+
+typedef struct _GMainContext GMainContext;
+typedef struct _GPollFD GPollFD;
+typedef struct _GSource GSource;
+
+namespace ui {
+union WaylandEvent;
+}  // namespace ui
+
+namespace base {
+
+// The documentation for this class is in message_pump_glib.h
+class BASE_EXPORT MessagePumpObserver {
+ public:
+   enum EventStatus {
+     EVENT_CONTINUE,    // The event should be dispatched as normal.
+     EVENT_HANDLED      // The event should not be processed any farther.
+   };
+
+  // This method is called before processing an Event. If the method returns
+  // EVENT_HANDLED, it indicates the event has already been handled, so the
+  // event is not processed any farther. If the method returns EVENT_CONTINUE,
+  // the event dispatching proceeds as normal.
+  virtual EventStatus WillProcessEvent(ui::WaylandEvent* event);
+
+ protected:
+  virtual ~MessagePumpObserver() {}
+};
+
+// The documentation for this class is in message_pump_glib.h
+//
+// The nested loop is exited by either posting a quit, or returning false
+// from Dispatch.
+class MessagePumpDispatcher {
+ public:
+  enum DispatchStatus {
+    EVENT_IGNORED,    // The event was not processed.
+    EVENT_PROCESSED,  // The event has been processed.
+    EVENT_QUIT        // The event was processed and the message-loop should
+                      // terminate.
+  };
+
+  // Dispatches the event. If true is returned processing continues as
+  // normal. If false is returned, the nested loop exits immediately.
+  virtual DispatchStatus Dispatch(ui::WaylandEvent* event) = 0;
+
+ protected:
+  virtual ~MessagePumpDispatcher() {}
+};
+
+class BASE_EXPORT MessagePumpWayland : public MessagePumpGlib {
+
+ public:
+  MessagePumpWayland();
+  virtual ~MessagePumpWayland();
+
+  // Overridden from MessagePumpGlib
+  virtual bool RunOnce(GMainContext* context, bool block) OVERRIDE;
+ private:
+
+  // This is a GLib structure that we can add event sources to.
+  GMainContext* context_;
+
+  DISALLOW_COPY_AND_ASSIGN(MessagePumpWayland);
+};
+
+typedef MessagePumpWayland MessagePumpForUI;
+
+}  // namespace base
+
+#endif  // BASE_MESSAGE_PUMP_WAYLAND_H_