Add PlatformWindow/Event related code for Ozone X11.

ui/platform_window/x11/x11_window.h

Index: ui/platform_window/x11/x11_window.h
diff --git a/ui/platform_window/x11/x11_window.h b/ui/platform_window/x11/x11_window.h
index 54bbed860829f9cb759bd6f66e3e3147d03a5c9b..54808714350712ed79e705a23920c900c78e027f 100644
--- a/ui/platform_window/x11/x11_window.h
+++ b/ui/platform_window/x11/x11_window.h
@@ -7,8 +7,10 @@
 
 #include <stdint.h>
 
+#include "base/callback.h"
 #include "base/macros.h"
 #include "ui/events/platform/platform_event_dispatcher.h"
+#include "ui/events/platform/x11/x11_event_source.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/x/x11_atom_cache.h"
 #include "ui/platform_window/platform_window.h"
@@ -17,19 +19,19 @@
 
 typedef struct _XDisplay XDisplay;
 typedef unsigned long XID;
+typedef union _XEvent XEvent;
 
 namespace ui {
 
 class X11_WINDOW_EXPORT X11Window : public PlatformWindow,
-                                    public PlatformEventDispatcher {
+                                    public PlatformEventDispatcher,
+                                    public XEventDispatcher {
  public:
   explicit X11Window(PlatformWindowDelegate* delegate);
   ~X11Window() override;
 
- private:
-  void Destroy();
-
-  void ProcessXInput2Event(XEvent* xevent);
+  // Creates new underlying XWindow. Does not map XWindow.
+  void Create();
 
   // PlatformWindow:
   void Show() override;
@@ -49,10 +51,19 @@ class X11_WINDOW_EXPORT X11Window : public PlatformWindow,
   void ConfineCursorToBounds(const gfx::Rect& bounds) override;
   PlatformImeController* GetPlatformImeController() override;
 
+ private:
+  void Destroy();
+
+  void ProcessXInput2Event(XEvent* xev);
+  void ProcessXWindowEvent(const XEvent& xev);
+
   // PlatformEventDispatcher:
   bool CanDispatchEvent(const PlatformEvent& event) override;
   uint32_t DispatchEvent(const PlatformEvent& event) override;
 
+  // XEventDispatcher:
+  bool DispatchXEvent(const XEvent& xev) override;
+
   PlatformWindowDelegate* delegate_;
 
   XDisplay* xdisplay_;
@@ -68,7 +79,7 @@ class X11_WINDOW_EXPORT X11Window : public PlatformWindow,
   gfx::Rect requested_bounds_;
   gfx::Rect confirmed_bounds_;
 
-  bool window_mapped_;
+  bool window_mapped_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(X11Window);
 };