Add WebDragData to blink::WebView::dragtargetDrop

content/public/browser/render_view_host.h

Index: content/public/browser/render_view_host.h
diff --git a/content/public/browser/render_view_host.h b/content/public/browser/render_view_host.h
index 1a4d1646d708a80fc6c84e0c3b7e821212ca1f98..134326908dd8cd9766c5571ac0fbc136f18bafac 100644
--- a/content/public/browser/render_view_host.h
+++ b/content/public/browser/render_view_host.h
@@ -130,6 +130,9 @@ class CONTENT_EXPORT RenderViewHost : public IPC::Sender {
   virtual void DragSourceSystemDragEnded() = 0;
 
   // D&d drop target messages that get sent to WebKit.
+  // On Android, drop data is not available at DragTargetDragEnter. So only a
+  // dummy drop_data with the data format is passed. On Aura, the drop data is
+  // available and passed in here.
   virtual void DragTargetDragEnter(
       const DropData& drop_data,
       const gfx::Point& client_pt,
@@ -142,7 +145,14 @@ class CONTENT_EXPORT RenderViewHost : public IPC::Sender {
       blink::WebDragOperationsMask operations_allowed,
       int key_modifiers) = 0;
   virtual void DragTargetDragLeave() = 0;
-  virtual void DragTargetDrop(const gfx::Point& client_pt,
+  // Drop data is only valid on Android during DragTargetDrop because this is
+  // the only time when drop data is accessible on Andorid.
+  // http://developer.android.com/reference/android/view/DragEvent.html
+  // On Aura, drop data at this time will be the same as it was in DragEnter,
+  // and an invalid drop data will be passed down to indicate reusing the drop
+  // data from DragEnter.
+  virtual void DragTargetDrop(const DropData& drop_data,
+                              const gfx::Point& client_pt,
                               const gfx::Point& screen_pt,
                               int key_modifiers) = 0;