Implement GLX for Ozone X11.

ui/gl/gl_surface_glx.cc

Index: ui/gl/gl_surface_glx.cc
diff --git a/ui/gl/gl_surface_glx.cc b/ui/gl/gl_surface_glx.cc
index e8427ed9e64cb56ffdb46aaa27c1c25ebf773a08..add3a62fc587b0447fb9a2d8ef4e51e0e728d1d9 100644
--- a/ui/gl/gl_surface_glx.cc
+++ b/ui/gl/gl_surface_glx.cc
@@ -520,13 +520,7 @@ bool NativeViewGLSurfaceGLX::Initialize(GLSurface::Format format) {
                           CopyFromParent, CWBackPixmap | CWBitGravity, &swa);
   XMapWindow(g_display, window_);
 
-  ui::PlatformEventSource* event_source =
-      ui::PlatformEventSource::GetInstance();
-  // Can be nullptr in tests, when we don't care about Exposes.
-  if (event_source) {
-    XSelectInput(g_display, window_, ExposureMask);
-    ui::PlatformEventSource::GetInstance()->AddPlatformEventDispatcher(this);
-  }
+  RegisterEvents();
   XFlush(g_display);
 
   GetConfig();
@@ -560,28 +554,13 @@ void NativeViewGLSurfaceGLX::Destroy() {
     glx_window_ = 0;
   }
   if (window_) {
-    ui::PlatformEventSource* event_source =
-        ui::PlatformEventSource::GetInstance();
-    if (event_source)
-      event_source->RemovePlatformEventDispatcher(this);
+    UnregisterEvents();
     XDestroyWindow(g_display, window_);
     window_ = 0;
     XFlush(g_display);
   }
 }
 
-bool NativeViewGLSurfaceGLX::CanDispatchEvent(const ui::PlatformEvent& event) {
-  return event->type == Expose && event->xexpose.window == window_;
-}
-
-uint32_t NativeViewGLSurfaceGLX::DispatchEvent(const ui::PlatformEvent& event) {
-  XEvent forwarded_event = *event;
-  forwarded_event.xexpose.window = parent_window_;
-  XSendEvent(g_display, parent_window_, False, ExposureMask, &forwarded_event);
-  XFlush(g_display);
-  return ui::POST_DISPATCH_STOP_PROPAGATION;
-}
-
 bool NativeViewGLSurfaceGLX::Resize(const gfx::Size& size,
                                     float scale_factor,
                                     bool has_alpha) {
@@ -639,6 +618,18 @@ NativeViewGLSurfaceGLX::~NativeViewGLSurfaceGLX() {
   Destroy();
 }
 
+void NativeViewGLSurfaceGLX::ForwardExposeEvent(XEvent* event) {
+  XEvent forwarded_event = *event;
+  forwarded_event.xexpose.window = parent_window_;
+  XSendEvent(g_display, parent_window_, False, ExposureMask, &forwarded_event);
+  XFlush(g_display);
+}
+
+bool NativeViewGLSurfaceGLX::CanHandleEvent(XEvent* event) {
+  return event->type == Expose &&
+         event->xexpose.window == static_cast<Window>(window_);
+}
+
 UnmappedNativeViewGLSurfaceGLX::UnmappedNativeViewGLSurfaceGLX(
     const gfx::Size& size)
     : size_(size), config_(nullptr), window_(0), glx_window_(0) {