Add a glBegin/End pair to make glBindFramebuffer work

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 1302cce4e5331b558a502e4311fac3a1ed7e529a..ec04c9626dab43a7c4565846909cf17eadcf0324 100644
--- a/ui/gl/gl_surface.h
+++ b/ui/gl/gl_surface.h
@@ -88,6 +88,10 @@ class GL_EXPORT GLSurface : public base::RefCounted<GLSurface> {
   // on error.
   virtual bool OnMakeCurrent(GLContext* context);
 
+  // Called when the surface is bound as the current framebuffer for the
+  // current context.
+  virtual void NotifyWasBound();
+
   // Used for explicit buffer management.
   virtual bool SetBackbufferAllocation(bool allocated);
   virtual void SetFrontbufferAllocation(bool allocated);