Route OnDragEvent through ViewAndroid tree

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 eff9592f07db01ecd2f28483d440de7716d82d9c..89aedbbbedec5c1f954894971f87431a4841e362 100644
--- a/android_webview/java/src/org/chromium/android_webview/AwContents.java
+++ b/android_webview/java/src/org/chromium/android_webview/AwContents.java
@@ -3188,7 +3188,7 @@ public class AwContents implements SmartClipProvider {
 
         @Override
         public boolean onDragEvent(DragEvent event) {
-            return mContentViewCore.onDragEvent(event);
+            return mWebContents.getEventForwarder().onDragEvent(event, mContainerView);
         }
 
         @Override