Add UMA stats for which icon types are shown and clicked on the NTP.

chrome/android/java/src/org/chromium/chrome/browser/ntp/MostVisitedItem.java

 // 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.
 
 package org.chromium.chrome.browser.ntp;
 
 import android.view.ContextMenu;
 import android.view.ContextMenu.ContextMenuInfo;
 import android.view.MenuItem;
 import android.view.MenuItem.OnMenuItemClickListener;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.view.View.OnCreateContextMenuListener;
 
 /**
  * Displays the title, thumbnail, and favicon of a most visited page. The item can be clicked, or
  * long-pressed to trigger a context menu with options to "open in new tab", "open in incognito
  * tab", or "remove".
  */
 public class MostVisitedItem implements OnCreateContextMenuListener,
         MenuItem.OnMenuItemClickListener, OnClickListener {
 
-    private MostVisitedItemManager mManager;
-    private String mTitle;
-    private String mUrl;
-    private int mIndex;
-    private View mView;
-
     /**
      * Interface for an object that handles callbacks from a MostVisitedItem.
      */
     public interface MostVisitedItemManager {
         /**
          * Navigates to a most visited page in the existing tab.
          * @param item The most visited item to open.
          */
         void open(MostVisitedItem item);
 
         /**
          * Allows the manager to add context menu items for a given MostVisitedItem.
          * @param menu The context menu that should be used to add menu items.
          * @param listener Listener that should get the callbacks for context menu selections.
          */
         void onCreateContextMenu(ContextMenu menu, OnMenuItemClickListener listener);
 
         /**
          * Handles context menu item clicks.
          * @param menuId Id of the menu item that was selected.
          * @param item MostVisitedItem that triggered the context menu.
          * @return Whether a menu item was selected successfully.
          */
         boolean onMenuItemClick(int menuId, MostVisitedItem item);
     }
 
+    private MostVisitedItemManager mManager;
+    private String mTitle;
+    private String mUrl;
+    private int mIndex;
+    private int mTileType;
+    private View mView;
+
     /**
      * Constructs a MostVisitedItem with the given manager, title, URL, index, and view.
      *
      * @param manager The NewTabPageManager used to handle clicks and context menu events.
      * @param title The title of the page.
      * @param url The URL of the page.
      * @param index The index of this item in the list of most visited items.
-     * @param view The View that will display the item. The MostVisitedItem will handle clicks
-     *             on this view.
      */
-    public MostVisitedItem(MostVisitedItemManager manager, String title, String url, int index,
-            View view) {
+    public MostVisitedItem(MostVisitedItemManager manager, String title, String url, int index) {
         mManager = manager;
         mTitle = title;
         mUrl = url;
         mIndex = index;
+        mTileType = MostVisitedTileType.NONE;
+    }
+
+    /**
+     * Sets the view that will display this item. MostVisitedItem will handle clicks on the view.
+     * This should be called exactly once.
+     */
+    public void initView(View view) {
+        assert mView == null;
         mView = view;
         mView.setOnClickListener(this);
         mView.setOnCreateContextMenuListener(this);
     }
 
     /**
      * @return The view representing this item.
      */
     public View getView() {
         return mView;
@@ skipping 20 matching lines @@
         return mIndex;
     }
 
     /**
      * Updates this item's index in the list of most visited items.
      */
     public void setIndex(int index) {
         mIndex = index;
     }
 
+    /**
+     * @return The visual type of this most visited item. Valid values are listed in
+     *         {@link MostVisitedTileType}.
+     */
+    public int getTileType() {
+        return mTileType;
+    }
+
+    /**
+     * Sets the visual type of this most visited item. Valid values are listed in
+     * {@link MostVisitedTileType}.
+     */
+    public void setTileType(int type) {
+        mTileType = type;
+    }
+
     @Override
     public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
         mManager.onCreateContextMenu(menu, this);
     }
 
     @Override
     public boolean onMenuItemClick(MenuItem item) {
         return mManager.onMenuItemClick(item.getItemId(), this);
     }
 
     @Override
     public void onClick(View v) {
         mManager.open(this);
     }
 }