[Ozone] Explicitly whilelist valid GL platforms and fail GL initialization otherwise

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 4ce8fde1bd410e2bf712c189187cf0add7563647..5cf70c7eec27e78c2afee459306add12044110d4 100644
--- a/ui/gl/gl_surface_ozone.cc
+++ b/ui/gl/gl_surface_ozone.cc
@@ -29,10 +29,14 @@ bool GLSurface::InitializeOneOffInternal() {
         LOG(ERROR) << "GLSurfaceEGL::InitializeOneOff failed.";
         return false;
       }
+
+      return true;
+    case kGLImplementationOSMesaGL:
+    case kGLImplementationMockGL:
+      return true;
     default:
-      break;
+      return false;
   }
-  return true;
 }
 
 // static