Implement GLX for Ozone X11.

ui/gl/gl_surface_ozone.cc

Index: ui/gl/gl_surface_ozone.cc
diff --git a/ui/gl/gl_surface_ozone.cc b/ui/gl/gl_surface_ozone.cc
index d4d2fe1ca4beb3f11397b95fa53b1ad2971c441b..8b7148d1d3ccfaf2cec368f26f3093838fd1a897 100644
--- a/ui/gl/gl_surface_ozone.cc
+++ b/ui/gl/gl_surface_ozone.cc
@@ -32,6 +32,13 @@
 #include "ui/ozone/public/surface_factory_ozone.h"
 #include "ui/ozone/public/surface_ozone_egl.h"
 
+#if defined(USE_GLX)
+#include <X11/Xlib.h>
+
+#include "ui/events/platform/x11/x11_event_source_libevent.h"
+#include "ui/gl/gl_surface_glx.h"
+#endif
+
 using gl::GLImage;
 
 namespace gfx {
@@ -653,6 +660,64 @@ bool GLSurfaceOzoneSurfacelessSurfaceImpl::CreatePixmaps() {
   return true;
 }
 
+#if defined(USE_GLX)
+
+// Ozone specific implementation of GLX surface. Registers as XEventDispatcher
+// to handle XEvents.
+class GL_EXPORT NativeViewGLSurfaceGLXOzone : public NativeViewGLSurfaceGLX,
+                                              public ui::XEventDispatcher {
+ public:
+  explicit NativeViewGLSurfaceGLXOzone(gfx::AcceleratedWidget window);
+
+  // XEventDispatcher implementation:
+  bool DispatchXEvent(XEvent* xevent) override;
+
+ protected:
+  ~NativeViewGLSurfaceGLXOzone() override;
+
+  // NativeViewGLSurfaceGLX implementation:
+  void RegisterEvents() override;
+  void UnregisterEvents() override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(NativeViewGLSurfaceGLXOzone);
+};
+
+NativeViewGLSurfaceGLXOzone::NativeViewGLSurfaceGLXOzone(
+    gfx::AcceleratedWidget window)
+    : NativeViewGLSurfaceGLX(window) {}
+
+bool NativeViewGLSurfaceGLXOzone::DispatchXEvent(XEvent* event) {
+  if (!CanHandleEvent(event))
+    return false;
+
+  ForwardExposeEvent(event);
+  return true;
+}
+
+NativeViewGLSurfaceGLXOzone::~NativeViewGLSurfaceGLXOzone() {
+  Destroy();
+}
+
+void NativeViewGLSurfaceGLXOzone::RegisterEvents() {
+  ui::X11EventSourceLibevent* event_source =
+      ui::X11EventSourceLibevent::GetInstance();
+  // Can be nullptr in tests, when we don't care about Exposes.
+  if (event_source) {
+    XSelectInput(gfx::GetXDisplay(), window(), ExposureMask);
+    event_source->AddXEventDispatcher(this);
+  }
+}
+
+void NativeViewGLSurfaceGLXOzone::UnregisterEvents() {
+  ui::X11EventSourceLibevent* event_source =
+      ui::X11EventSourceLibevent::GetInstance();
+  if (event_source)
+    event_source->RemoveXEventDispatcher(this);
+}
+
+#endif  // defined(USE_GLX)
+
 scoped_refptr<GLSurface> CreateViewGLSurfaceOzone(
     gfx::AcceleratedWidget window) {
   std::unique_ptr<ui::SurfaceOzoneEGL> surface_ozone =
@@ -688,6 +753,15 @@ scoped_refptr<GLSurface> CreateViewGLSurfaceOzoneSurfacelessSurfaceImpl(
 // static
 bool GLSurface::InitializeOneOffInternal() {
   switch (GetGLImplementation()) {
+#if defined(USE_GLX)
+    case kGLImplementationDesktopGL:
+      if (!GLSurfaceGLX::InitializeOneOff()) {
+        LOG(ERROR) << "GLSurfaceGLX::InitializeOneOff failed.";
+        return false;
+      }
+
+      return true;
+#endif
     case kGLImplementationEGLGLES2:
       if (!GLSurfaceEGL::InitializeOneOff()) {
         LOG(ERROR) << "GLSurfaceEGL::InitializeOneOff failed.";
@@ -727,6 +801,14 @@ scoped_refptr<GLSurface> GLSurface::CreateSurfacelessViewGLSurface(
 // static
 scoped_refptr<GLSurface> GLSurface::CreateViewGLSurface(
     gfx::AcceleratedWidget window) {
+#if defined(USE_GLX)
+  if (GetGLImplementation() == kGLImplementationDesktopGL) {
+    scoped_refptr<GLSurface> surface(new NativeViewGLSurfaceGLXOzone(window));
+    if (!surface->Initialize())
+      return nullptr;
+    return surface;
+  }
+#endif
   if (GetGLImplementation() == kGLImplementationOSMesaGL) {
     scoped_refptr<GLSurface> surface(new GLSurfaceOSMesaHeadless());
     if (!surface->Initialize())
@@ -753,6 +835,16 @@ scoped_refptr<GLSurface> GLSurface::CreateViewGLSurface(
 scoped_refptr<GLSurface> GLSurface::CreateOffscreenGLSurface(
     const gfx::Size& size) {
   switch (GetGLImplementation()) {
+#if defined(USE_GLX)
+    case kGLImplementationDesktopGL: {
+      scoped_refptr<GLSurface> surface(
+          new UnmappedNativeViewGLSurfaceGLX(size));
+      if (!surface->Initialize())
+        return nullptr;
+
+      return surface;
+    }
+#endif
     case kGLImplementationOSMesaGL: {
       scoped_refptr<GLSurface> surface(
           new GLSurfaceOSMesa(SURFACE_OSMESA_BGRA, size));