Reduce CPU usage of download shelf UI. (both MD and pre-MD shelves)

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 44745249f77302f29f3213c799511a055da946c7..9e4af8b4691558b427329d9da48bec386b953201 100644
--- a/chrome/browser/ui/views/download/download_item_view.h
+++ b/chrome/browser/ui/views/download/download_item_view.h
@@ -192,6 +192,9 @@ class DownloadItemView : public views::ButtonListener,
     return mode_ == DANGEROUS_MODE || mode_ == MALICIOUS_MODE;
   }
 
+  // Clears or shows the warning dialog as per the state of |model_|.
+  void ToggleWarningDialog();
+
   // Reverts from dangerous mode to normal download mode.
   void ClearWarningDialog();
 
@@ -232,6 +235,9 @@ class DownloadItemView : public views::ButtonListener,
   void AnimateStateTransition(State from, State to,
                               gfx::SlideAnimation* animation);
 
+  // Callback for |progress_timer_|.
+  void ProgressTimerFired();
+
   // The different images used for the background.
   BodyImageSet normal_body_image_set_;
   BodyImageSet hot_body_image_set_;