Add WebDragData to blink::WebView::dragtargetDrop

content/renderer/render_view_impl.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_RENDER_VIEW_IMPL_H_
 #define CONTENT_RENDERER_RENDER_VIEW_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 613 matching lines @@
                          const gfx::Point& location);
   void OnCopyImageAt(int x, int y);
   void OnSaveImageAt(int x, int y);
   void OnDeterminePageLanguage();
   void OnDisableScrollbarsForSmallWindows(
       const gfx::Size& disable_scrollbars_size_limit);
   void OnDragSourceEnded(const gfx::Point& client_point,
                          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,
                              blink::WebDragOperationsMask operations_allowed,
                              int key_modifiers);
   void OnDragTargetDragLeave();
   void OnDragTargetDragOver(const gfx::Point& client_pt,
                             const gfx::Point& screen_pt,
                             blink::WebDragOperationsMask operations_allowed,
                             int key_modifiers);
@@ skipping 360 matching lines @@
   // use the Observer interface to filter IPC messages and receive frame change
   // notifications.
   // ---------------------------------------------------------------------------
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_VIEW_IMPL_H_