Throw if webview has been destroyed

android_webview/java/src/org/chromium/android_webview/AwContents.java

Index: android_webview/java/src/org/chromium/android_webview/AwContents.java
diff --git a/android_webview/java/src/org/chromium/android_webview/AwContents.java b/android_webview/java/src/org/chromium/android_webview/AwContents.java
index c95137c7ec63a5d061f50cf0c56f4f90399adf86..6e0a6b4d1c6ea9d3423a01165fb44ecbc829444d 100644
--- a/android_webview/java/src/org/chromium/android_webview/AwContents.java
+++ b/android_webview/java/src/org/chromium/android_webview/AwContents.java
@@ -2067,8 +2067,12 @@ public class AwContents implements SmartClipProvider,
      * @param requestId an id that will be returned from the callback invocation to allow
      * callers to match requests with callbacks.
      * @param callback the callback to be inserted
+     * @throw IllegalStateException if this method is invoked after {@link #destroy()} has been
+     * called.
      */
     public void insertVisualStateCallback(long requestId, VisualStateCallback callback) {
+        if (isDestroyed()) throw new IllegalStateException(
+                "insertVisualStateCallback cannot be called after the WebView has been destroyed");
         nativeInsertVisualStateCallback(mNativeAwContents, requestId, callback);
     }