webview: canInvokeDrawGlFunctor should always return true

Now that invokeDrawGlFunctor doesn't use the View anymore, and just
calls a static method on ViewRootImpl. In particular this is required
since invokeDrwaGlFunctor need to still function for views that already
detached.

BUG: 27709981
Change-Id: I2c8c8f4a6943f7eec773265ca709349c5ce0be54

core/java/android/webkit/WebViewDelegate.java

@@ -74,9 +74,7 @@ public final class WebViewDelegate {
      * and false otherwise.
      */
     public boolean canInvokeDrawGlFunctor(View containerView) {
-        ViewRootImpl viewRootImpl = containerView.getViewRootImpl();
-         // viewRootImpl can be null during teardown when window is leaked.
-        return viewRootImpl != null;
+        return true;
     }
 
     /**