Add WebDragData to blink::WebView::dragtargetDrop

content/renderer/render_view_impl.h

Index: content/renderer/render_view_impl.h
diff --git a/content/renderer/render_view_impl.h b/content/renderer/render_view_impl.h
index 8e5057e0e849a9b7a3da8eb9445fc045111c4879..5254453e8cb27882d6b0972a5f3ebee91f029804 100644
--- a/content/renderer/render_view_impl.h
+++ b/content/renderer/render_view_impl.h
@@ -631,9 +631,17 @@ class CONTENT_EXPORT RenderViewImpl
                          const gfx::Point& screen_point,
                          blink::WebDragOperation drag_operation);
   void OnDragSourceSystemDragEnded();
-  void OnDragTargetDrop(const gfx::Point& client_pt,
+  // |drop_data| will only be used when drop data is valid. This is
+  // because on most platforms (Aura), the drop data is available when the drag
+  // starts and stays the same until it's dropped. On Android, the drop data is
+  // unavailable until DragTargetDrop. So on Android, |drop_data| will contain
+  // the real data.
+  void OnDragTargetDrop(const DropData& drop_data,
+                        const gfx::Point& client_pt,
                         const gfx::Point& screen_pt,
                         int key_modifiers);
+  // On Android, |drop_data| will contain dummy data because drop data is
+  // unavailable until 'drop' action.
   void OnDragTargetDragEnter(const DropData& drop_data,
                              const gfx::Point& client_pt,
                              const gfx::Point& screen_pt,