X11: Use better visuals for OpenGL

ui/gl/gl_surface.h

Index: ui/gl/gl_surface.h
diff --git a/ui/gl/gl_surface.h b/ui/gl/gl_surface.h
index 35c1ded987a18d2cb839afd0292b4927ebd272f2..3e654cb8cf548789e696844689a5271ccc67c08d 100644
--- a/ui/gl/gl_surface.h
+++ b/ui/gl/gl_surface.h
@@ -160,6 +160,10 @@ class GL_EXPORT GLSurface : public base::RefCounted<GLSurface> {
   // Get the platfrom specific configuration for this surface, if available.
   virtual void* GetConfig();
 
+  // Get the key corresponding to the set of GLSurfaces that can be made current
+  // with this GLSurface.
+  virtual unsigned long GetCompatibilityKey();
+
   // Get the GL pixel format of the surface, if available.
   virtual GLSurface::Format GetFormat();
 
@@ -267,6 +271,7 @@ class GL_EXPORT GLSurfaceAdapter : public GLSurface {
   void* GetShareHandle() override;
   void* GetDisplay() override;
   void* GetConfig() override;
+  unsigned long GetCompatibilityKey() override;
   GLSurface::Format GetFormat() override;
   gfx::VSyncProvider* GetVSyncProvider() override;
   bool ScheduleOverlayPlane(int z_order,