Make the Data Saver site breakdown "Remaining sites" expandable

chrome/android/java/src/org/chromium/chrome/browser/preferences/datareduction/DataReductionSiteBreakdownView.java

 // Copyright 2017 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.preferences.datareduction;
 
 import android.content.Context;
 import android.graphics.drawable.Drawable;
 import android.support.annotation.ColorInt;
 import android.text.format.Formatter;
@@ skipping 11 matching lines @@
 import java.io.Serializable;
 import java.util.Collections;
 import java.util.Comparator;
 import java.util.List;
 
 /**
  * A site breakdown view to be used by the Data Saver settings page. It displays the top ten sites
  * with the most data use or data savings.
  */
 public class DataReductionSiteBreakdownView extends LinearLayout {
-    private static final int NUM_DATA_USE_ITEMS_TO_DISPLAY = 10;
+    private static final int NUM_DATA_USE_ITEMS_TO_ADD = 10;
+    private int mNumDataUseItemsToDisplay = 10;
 
     private TableLayout mTableLayout;
     private TextView mDataUsedTitle;
     private TextView mDataSavedTitle;
     private List<DataReductionDataUseItem> mDataUseItems;
     @ColorInt
     private int mTextColor;
     @ColorInt
     private int mLightTextColor;
 
@@ skipping 116 matching lines @@
 
         setVisibility(VISIBLE);
         // Remove all old rows except the header.
         mTableLayout.removeViews(1, mTableLayout.getChildCount() - 1);
 
         int numRemainingSites = 0;
         int everythingElseDataUsage = 0;
         int everythingElseDataSavings = 0;
 
         for (int i = 0; i < mDataUseItems.size(); i++) {
-            if (i < NUM_DATA_USE_ITEMS_TO_DISPLAY) {
+            if (i < mNumDataUseItemsToDisplay) {
                 TableRow row = (TableRow) LayoutInflater.from(getContext())
                                        .inflate(R.layout.data_usage_breakdown_row, null);
 
                 TextView hostnameView = (TextView) row.findViewById(R.id.site_hostname);
                 TextView dataUsedView = (TextView) row.findViewById(R.id.site_data_used);
                 TextView dataSavedView = (TextView) row.findViewById(R.id.site_data_saved);
 
                 hostnameView.setText(mDataUseItems.get(i).getHostname());
                 dataUsedView.setText(mDataUseItems.get(i).getFormattedDataUsed(getContext()));
                 dataSavedView.setText(mDataUseItems.get(i).getFormattedDataSaved(getContext()));
@@ skipping 20 matching lines @@
             dataSavedView.setText(
                     Formatter.formatFileSize(getContext(), everythingElseDataSavings));
 
             int lightActiveColor = ApiCompatibilityUtils.getColor(
                     getContext().getResources(), R.color.light_active_color);
 
             hostnameView.setTextColor(lightActiveColor);
             dataUsedView.setTextColor(lightActiveColor);
             dataSavedView.setTextColor(lightActiveColor);
 
-            mTableLayout.addView(row, NUM_DATA_USE_ITEMS_TO_DISPLAY + 1);
+            row.setOnClickListener(new OnClickListener() {
+                @Override
+                public void onClick(View v) {
+                    mNumDataUseItemsToDisplay += NUM_DATA_USE_ITEMS_TO_ADD;
+                    updateSiteBreakdown();
+                }
+            });
+
+            mTableLayout.addView(row, mNumDataUseItemsToDisplay + 1);
         }
 
         mTableLayout.requestLayout();
     }
 }