am 6fb27c5a: am 96cfad5d: check for null before calling native webkit from java webview

Merge commit '6fb27c5a68ab4de9d7d4caf737da8effa2f63217'

* commit '6fb27c5a68ab4de9d7d4caf737da8effa2f63217':
  check for null before calling native webkit from java webview

core/java/android/webkit/WebViewCore.java

@@ -1650,12 +1650,14 @@ final class WebViewCore {
     }
 
     /* package */ synchronized boolean pictureReady() {
-        return nativePictureReady();
+        return 0 != mNativeClass ? nativePictureReady() : false;
     }
 
     /*package*/ synchronized Picture copyContentPicture() {
         Picture result = new Picture();
-        nativeCopyContentToPicture(result);
+        if (0 != mNativeClass) {
+            nativeCopyContentToPicture(result);
+        }
         return result;
     }