Centered flood fill style ink drop ripples on mouse/touch points.

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

 // Copyright 2015 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.
 //
 // A view that implements one download on the Download shelf.
 // Each DownloadItemViewMd contains an application icon, a text label
 // indicating the download's file name, a text label indicating the
 // download's status (such as the number of bytes downloaded so far)
 // and a button for canceling an in progress download, or opening
 // the completed download.
@@ skipping 121 matching lines @@
  private:
   enum State { NORMAL = 0, HOT, PUSHED };
   class DropDownButton;
 
   enum Mode {
     NORMAL_MODE = 0,  // Showing download item.
     DANGEROUS_MODE,   // Displaying the dangerous download warning.
     MALICIOUS_MODE    // Displaying the malicious download warning.
   };
 
-  void OpenDownload();
+  void OpenDownload(const ui::Event& event);
 
   // Submits the downloaded file to the safebrowsing download feedback service.
   // Returns whether submission was successful. On successful submission,
   // |this| and the DownloadItem will have been deleted.
   bool SubmitDownloadToFeedbackService();
 
   // If the user has |enabled| uploading, calls SubmitDownloadToFeedbackService.
   // Otherwise, it simply removes the DownloadItem without uploading.
   void PossiblySubmitDownloadToFeedbackService(bool enabled);
 
@@ skipping 167 matching lines @@
   std::unique_ptr<extensions::ExperienceSamplingEvent> sampling_event_;
 
   // Method factory used to delay reenabling of the item when opening the
   // downloaded file.
   base::WeakPtrFactory<DownloadItemViewMd> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadItemViewMd);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_DOWNLOAD_DOWNLOAD_ITEM_VIEW_MD_H_