Route OnDragEvent through ViewAndroid tree

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

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.android_webview;
 
 import android.annotation.SuppressLint;
 import android.annotation.TargetApi;
 import android.app.Activity;
 import android.content.ComponentCallbacks2;
@@ skipping 3170 matching lines @@
         }
 
         @Override
         public InputConnection onCreateInputConnection(EditorInfo outAttrs) {
             return isDestroyedOrNoOperation(NO_WARN) ? null
                     : mContentViewCore.onCreateInputConnection(outAttrs);
         }
 
         @Override
         public boolean onDragEvent(DragEvent event) {
-            return mContentViewCore.onDragEvent(event);
+            return mWebContents.getEventForwarder().onDragEvent(event, mContainerView);
         }
 
         @Override
         public boolean onKeyUp(int keyCode, KeyEvent event) {
             return isDestroyedOrNoOperation(NO_WARN) ? false
                     : mContentViewCore.onKeyUp(keyCode, event);
         }
 
         @Override
         public boolean dispatchKeyEvent(KeyEvent event) {
@@ skipping 326 matching lines @@
     private native void nativeTrimMemory(long nativeAwContents, int level, boolean visible);
 
     private native void nativeCreatePdfExporter(long nativeAwContents, AwPdfExporter awPdfExporter);
 
     private native void nativePreauthorizePermission(long nativeAwContents, String origin,
             long resources);
 
     private native void nativeGrantFileSchemeAccesstoChildProcess(long nativeAwContents);
     private native void nativeResumeLoadingCreatedPopupWebContents(long nativeAwContents);
 }