Convert drag event position to root frame.

third_party/WebKit/Source/web/WebViewImpl.h

Index: third_party/WebKit/Source/web/WebViewImpl.h
diff --git a/third_party/WebKit/Source/web/WebViewImpl.h b/third_party/WebKit/Source/web/WebViewImpl.h
index e1f4e60dab2f6fe3d66fb59975ba5ed26f25c77d..238b0966ebc6818e8a1a67f1c71ed5c80f122dd2 100644
--- a/third_party/WebKit/Source/web/WebViewImpl.h
+++ b/third_party/WebKit/Source/web/WebViewImpl.h
@@ -231,22 +231,22 @@ class WEB_EXPORT WebViewImpl final
   WebHitTestResult hitTestResultAt(const WebPoint&) override;
   WebHitTestResult hitTestResultForTap(const WebPoint&,
                                        const WebSize&) override;
-  void dragSourceEndedAt(const WebPoint& clientPoint,
+  void dragSourceEndedAt(const WebPoint& pointInViewport,
                          const WebPoint& screenPoint,
                          WebDragOperation) override;
   void dragSourceSystemDragEnded() override;
   WebDragOperation dragTargetDragEnter(const WebDragData&,
-                                       const WebPoint& clientPoint,
+                                       const WebPoint& pointInViewport,
                                        const WebPoint& screenPoint,
                                        WebDragOperationsMask operationsAllowed,
                                        int modifiers) override;
-  WebDragOperation dragTargetDragOver(const WebPoint& clientPoint,
+  WebDragOperation dragTargetDragOver(const WebPoint& pointInViewport,
                                       const WebPoint& screenPoint,
                                       WebDragOperationsMask operationsAllowed,
                                       int modifiers) override;
   void dragTargetDragLeave() override;
   void dragTargetDrop(const WebDragData&,
-                      const WebPoint& clientPoint,
+                      const WebPoint& pointInViewport,
                       const WebPoint& screenPoint,
                       int modifiers) override;
   void spellingMarkers(WebVector<uint32_t>* markers) override;
@@ -572,7 +572,7 @@ class WEB_EXPORT WebViewImpl final
   // Consolidate some common code between starting a drag over a target and
   // updating a drag over a target. If we're starting a drag, |isEntering|
   // should be true.
-  WebDragOperation dragTargetDragEnterOrOver(const WebPoint& clientPoint,
+  WebDragOperation dragTargetDragEnterOrOver(const WebPoint& pointInViewport,
                                              const WebPoint& screenPoint,
                                              DragAction,
                                              int modifiers);