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 26e93e70cab528ef4957290ae5bffb546eab2d11..990005c3c86368b17ecb7aa03c8ec514cb5fead7 100644
--- a/third_party/WebKit/Source/web/WebViewImpl.h
+++ b/third_party/WebKit/Source/web/WebViewImpl.h
@@ -236,25 +236,25 @@ public:
     WebHitTestResult hitTestResultAt(const WebPoint&) override;
     WebHitTestResult hitTestResultForTap(const WebPoint&, const WebSize&) override;
     void dragSourceEndedAt(
-        const WebPoint& clientPoint,
+        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,
+        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;
@@ -577,7 +577,7 @@ private:
     // 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);