Add PlatformWindow/Event related code for Ozone X11.

ui/events/platform/x11/x11_event_source.h

Index: ui/events/platform/x11/x11_event_source.h
diff --git a/ui/events/platform/x11/x11_event_source.h b/ui/events/platform/x11/x11_event_source.h
index 26d646016607273684183310df1a393d8e0d1558..292136630c0ed848d38d2fd137f29919caf3f0c0 100644
--- a/ui/events/platform/x11/x11_event_source.h
+++ b/ui/events/platform/x11/x11_event_source.h
@@ -13,8 +13,6 @@
 #include "ui/events/platform/platform_event_source.h"
 #include "ui/gfx/x/x11_types.h"
 
-typedef struct _GPollFD GPollFD;
-typedef struct _GSource GSource;
 typedef union _XEvent XEvent;
 typedef unsigned long XID;
 
@@ -22,8 +20,8 @@ namespace ui {
 
 class X11HotplugEventHandler;
 
-// A PlatformEventSource implementation for reading events from X11 server and
-// dispatching the events to the appropriate dispatcher.
+// Abstract PlatformEventSource implementation for reading events from X11
+// server.
 class EVENTS_EXPORT X11EventSource : public PlatformEventSource {
  public:
   explicit X11EventSource(XDisplay* display);
@@ -31,7 +29,7 @@ class EVENTS_EXPORT X11EventSource : public PlatformEventSource {
 
   static X11EventSource* GetInstance();
 
-  // Called by the glib source dispatch function. Processes all (if any)
+  // Called when there is a new XEvent available. Processes all (if any)
   // available X events.
   void DispatchXEvents();
 
@@ -47,25 +45,27 @@ class EVENTS_EXPORT X11EventSource : public PlatformEventSource {
   void BlockUntilWindowMapped(XID window);
 
  protected:
-  XDisplay* display() { return display_; }
-
- private:
   // Extracts cookie data from |xevent| if it's of GenericType, and dispatches
   // the event. This function also frees up the cookie data after dispatch is
   // complete.
-  uint32_t ExtractCookieDataDispatchEvent(XEvent* xevent);
+  void ExtractCookieDataDispatchEvent(XEvent* xevent);
+
+  // Handles updates after event has been dispatched.
+  void PostDispatchEvent(XEvent* xevent);
 
   // PlatformEventSource:
-  uint32_t DispatchEvent(XEvent* xevent) override;
   void StopCurrentEventStream() override;
   void OnDispatcherListChanged() override;
 
+  XDisplay* display() { return display_; }
+
+ private:
   // The connection to the X11 server used to receive the events.
   XDisplay* display_;
 
   // Keeps track of whether this source should continue to dispatch all the
   // available events.
-  bool continue_stream_;
+  bool continue_stream_ = true;
 
   scoped_ptr<X11HotplugEventHandler> hotplug_event_handler_;