Experience sampling instrumentation for dangerous downloads warnings

chrome/browser/ui/views/download/download_item_view.h

Index: chrome/browser/ui/views/download/download_item_view.h
diff --git a/chrome/browser/ui/views/download/download_item_view.h b/chrome/browser/ui/views/download/download_item_view.h
index 9920bc47e3d7b8739bf3ab88e3edc125b6a6e1af..5b6fd7e0f1a9366c2cb28a9cfa54d6f375184f19 100644
--- a/chrome/browser/ui/views/download/download_item_view.h
+++ b/chrome/browser/ui/views/download/download_item_view.h
@@ -38,6 +38,10 @@
 class DownloadShelfView;
 class DownloadShelfContextMenuView;
 
+namespace extensions {
+class SamplingEvent;
+}
+
 namespace gfx {
 class Image;
 class ImageSkia;
@@ -339,6 +343,9 @@ class DownloadItemView : public views::ButtonListener,
   // and reload the icon.
   base::FilePath last_download_item_path_;
 
+  // ExperienceSampling: This maintains event state.
+  scoped_ptr<extensions::SamplingEvent> sampling_event_;
+
   DISALLOW_COPY_AND_ASSIGN(DownloadItemView);
 };