Convert drag event position to root frame.

third_party/WebKit/public/web/WebView.h

Index: third_party/WebKit/public/web/WebView.h
diff --git a/third_party/WebKit/public/web/WebView.h b/third_party/WebKit/public/web/WebView.h
index 61b82fa56cca74dec98cb17e8a326d9eafd697f2..d877ff0a65a8aa52baae430abc0a0fdecc71dc45 100644
--- a/third_party/WebKit/public/web/WebView.h
+++ b/third_party/WebKit/public/web/WebView.h
@@ -370,7 +370,7 @@ class WebView : protected WebWidget {
                                                const WebSize& tapArea) = 0;
 
   // Notifies the WebView that a drag has terminated.
-  virtual void dragSourceEndedAt(const WebPoint& clientPoint,
+  virtual void dragSourceEndedAt(const WebPoint& pointInViewport,
                                  const WebPoint& screenPoint,
                                  WebDragOperation operation) = 0;
 
@@ -381,18 +381,18 @@ class WebView : protected WebWidget {
   // something on the WebView.
   virtual WebDragOperation dragTargetDragEnter(
       const WebDragData&,
-      const WebPoint& clientPoint,
+      const WebPoint& pointInViewport,
       const WebPoint& screenPoint,
       WebDragOperationsMask operationsAllowed,
       int modifiers) = 0;
   virtual WebDragOperation dragTargetDragOver(
-      const WebPoint& clientPoint,
+      const WebPoint& pointInViewport,
       const WebPoint& screenPoint,
       WebDragOperationsMask operationsAllowed,
       int modifiers) = 0;
   virtual void dragTargetDragLeave() = 0;
   virtual void dragTargetDrop(const WebDragData&,
-                              const WebPoint& clientPoint,
+                              const WebPoint& pointInViewport,
                               const WebPoint& screenPoint,
                               int modifiers) = 0;