aura: Explicitly disable GTK

base/message_pump_x.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_X_H
 #define BASE_MESSAGE_PUMP_X_H
 
 #include "base/message_pump.h"
 #include "base/message_pump_glib.h"
 
 #include <bitset>
 
 #include <glib.h>
+
+#if defined(TOOLKIT_USES_GTK)
 #include <gtk/gtk.h>
+#endif
 
 typedef union _XEvent XEvent;
 typedef struct _XDisplay Display;
 
 namespace base {
 
 // The documentation for this class is in message_pump_glib.h
 class BASE_EXPORT MessagePumpObserver {
  public:
    enum EventStatus {
@@ skipping 32 matching lines @@
  protected:
   virtual ~MessagePumpDispatcher() {}
 };
 
 // This class implements a message-pump for dispatching X events.
 class BASE_EXPORT MessagePumpX : public MessagePumpGlib {
  public:
   MessagePumpX();
   virtual ~MessagePumpX();
 
-  // Indicates whether a GDK event was injected by chrome (when |true|) or if it
-  // was captured and being processed by GDK (when |false|).
-  bool IsDispatchingEvent(void) { return dispatching_event_; }
-
   // Overridden from MessagePumpGlib:
   virtual bool RunOnce(GMainContext* context, bool block) OVERRIDE;
 
+#if defined(TOOLKIT_USES_GTK)
   // Disables Gtk/Gdk event pumping. This will be used when
   // NativeWidgetX is enabled.
   static void DisableGtkMessagePump();
+#endif
 
   // Returns default X Display.
   static Display* GetDefaultXDisplay();
 
   // Returns true if the system supports XINPUT2.
   static bool HasXInput2();
 
  private:
-  // Some XEvent's can't be directly read from X event queue and will go
-  // through GDK's dispatching process and may get discarded. This function
-  // sets up a filter to intercept those XEvent's we are interested in
-  // and dispatches them so that they won't get lost.
-  static GdkFilterReturn GdkEventFilter(GdkXEvent* gxevent,
-                                        GdkEvent* gevent,
-                                        gpointer data);
-
-  static void EventDispatcherX(GdkEvent* event, gpointer data);
+  // Initializes the glib event source for X.
+  void InitXSource();
 
   // Decides whether we are interested in processing this XEvent.
   bool ShouldCaptureXEvent(XEvent* event);
 
   // Dispatches the XEvent and returns true if we should exit the current loop
   // of message processing.
   bool ProcessXEvent(XEvent* event);
 
   // Sends the event to the observers. If an observer returns true, then it does
   // not send the event to any other observers and returns true. Returns false
   // if no observer returns true.
   bool WillProcessXEvent(XEvent* xevent);
+#if defined(TOOLKIT_USES_GTK)
+  // Some XEvent's can't be directly read from X event queue and will go
+  // through GDK's dispatching process and may get discarded. This function
+  // sets up a filter to intercept those XEvent's we are interested in
+  // and dispatches them so that they won't get lost.
+  static GdkFilterReturn GdkEventFilter(GdkXEvent* gxevent,
+                                        GdkEvent* gevent,
+                                        gpointer data);
+
+  static void EventDispatcherX(GdkEvent* event, gpointer data);
+
+  // Indicates whether a GDK event was injected by chrome (when |true|) or if it
+  // was captured and being processed by GDK (when |false|).
+  bool IsDispatchingEvent(void) { return dispatching_event_; }
 
   // Update the lookup table and flag the events that should be captured and
   // processed so that GDK doesn't get to them.
   void InitializeEventsToCapture(void);
 
-  // The event source for X events (used only when GTK event processing is
-  // disabled).
-  GSource* x_source_;
-
   // The event source for GDK events.
   GSource* gdksource_;
 
   // The default GDK event dispatcher. This is stored so that it can be restored
   // when necessary during nested event dispatching.
   gboolean (*gdkdispatcher_)(GSource*, GSourceFunc, void*);
 
   // Indicates whether a GDK event was injected by chrome (when |true|) or if it
   // was captured and being processed by GDK (when |false|).
   bool dispatching_event_;
 
 #if ! GTK_CHECK_VERSION(2,18,0)
 // GDK_EVENT_LAST was introduced in GTK+ 2.18.0. For earlier versions, we pick a
 // large enough value (the value of GDK_EVENT_LAST in 2.18.0) so that it works
 // for all versions.
 #define GDK_EVENT_LAST 37
 #endif
 
 // Ideally we would #include X.h for LASTEvent, but it brings in a lot of stupid
 // stuff (like Time, CurrentTime etc.) that messes up a lot of things. So define
 // XLASTEvent here to a large enough value so that it works.
 #define XLASTEvent 40
 
   // We do not want to process all the events ourselves. So we use a lookup
   // table to quickly check if a particular event should be handled by us or if
   // it should be passed on to the default GDK handler.
   std::bitset<XLASTEvent> capture_x_events_;
   std::bitset<GDK_EVENT_LAST> capture_gdk_events_;
+#endif  // defined(TOOLKIT_USES_GTK)
+
+  // The event source for X events (used only when GTK event processing is
+  // disabled).
+  GSource* x_source_;
 
   DISALLOW_COPY_AND_ASSIGN(MessagePumpX);
 };
 
 typedef MessagePumpX MessagePumpForUI;
 
 }  // namespace base
 
 #endif  // BASE_MESSAGE_PUMP_X_H