Implement GLX for Ozone X11.

ui/gl/gl_surface_glx.h

Index: ui/gl/gl_surface_glx.h
diff --git a/ui/gl/gl_surface_glx.h b/ui/gl/gl_surface_glx.h
index 03c127a4a8fca9007b089efb37d9100ff113e016..93f7da72a1853393d73a476acaefe7d6d894b97e 100644
--- a/ui/gl/gl_surface_glx.h
+++ b/ui/gl/gl_surface_glx.h
@@ -11,7 +11,6 @@
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
-#include "ui/events/platform/platform_event_dispatcher.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/vsync_provider.h"
@@ -52,8 +51,7 @@ class GL_EXPORT GLSurfaceGLX : public GLSurface {
 };
 
 // A surface used to render to a view.
-class GL_EXPORT NativeViewGLSurfaceGLX : public GLSurfaceGLX,
-                                         public ui::PlatformEventDispatcher {
+class GL_EXPORT NativeViewGLSurfaceGLX : public GLSurfaceGLX {
  public:
   explicit NativeViewGLSurfaceGLX(gfx::AcceleratedWidget window);
 
@@ -75,14 +73,22 @@ class GL_EXPORT NativeViewGLSurfaceGLX : public GLSurfaceGLX,
  protected:
   ~NativeViewGLSurfaceGLX() override;
 
+  // Handle registering and unregistering for Expose events.
+  virtual void RegisterEvents() = 0;
+  virtual void UnregisterEvents() = 0;
+
+  // Forwards Expose event to child window.
+  void ForwardExposeEvent(XEvent* xevent);
+
+  // Checks if event is Expose for child window.
+  bool CanHandleEvent(XEvent* xevent);
+
+  gfx::AcceleratedWidget window() const { return window_; }
+
  private:
   // The handle for the drawable to make current or swap.
   GLXDrawable GetDrawableHandle() const;
 
-  // PlatformEventDispatcher implementation
-  bool CanDispatchEvent(const ui::PlatformEvent& event) override;
-  uint32_t DispatchEvent(const ui::PlatformEvent& event) override;
-
   // Window passed in at creation. Always valid.
   gfx::AcceleratedWidget parent_window_;