Create a new Data Saver settings page that adds the site breakdown

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

Index: chrome/android/java/src/org/chromium/chrome/browser/preferences/datareduction/DataReductionDataUseItem.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/preferences/datareduction/DataReductionDataUseItem.java b/chrome/android/java/src/org/chromium/chrome/browser/preferences/datareduction/DataReductionDataUseItem.java
new file mode 100644
index 0000000000000000000000000000000000000000..762689bdf21c5adda8bd6bd8bed31dbb6a165e1f
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/preferences/datareduction/DataReductionDataUseItem.java
@@ -0,0 +1,73 @@
+// 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.text.format.Formatter;
+
+/**
+ * Stores the data used and saved by a hostname.
+ */
+public class DataReductionDataUseItem {
+    private String mHostname;
+    private long mDataUsed;
+    private long mOriginalSize;
+
+    /**
+     * Constructor for a DataReductionDataUseItem which associates a hostname with its data usage
+     * and savings.
+     *
+     * @param hostname The hostname associated with this data usage.
+     * @param dataUsed The amount of data used by the host.
+     * @param originalSize The original size of the data.
+     */
+    public DataReductionDataUseItem(String hostname, long dataUsed, long originalSize) {
+        mHostname = hostname;
+        mDataUsed = dataUsed;
+        mOriginalSize = originalSize;
+    }
+
+    /**
+     * Returns the hostname for this data use item.
+     * @return The hostname.
+     */
+    public String getHostname() {
+        return mHostname;
+    }
+
+    /**
+     * Returns the amount of data used by the associated hostname.
+     * @return The data used.
+     */
+    public long getDataUsed() {
+        return mDataUsed;
+    }
+
+    /**
+     * Returns the amount of data saved by the associated hostname.
+     * @return The data saved.
+     */
+    public long getDataSaved() {
+        return mOriginalSize - mDataUsed;
+    }
+
+    /**
+     * Returns a formatted String of the data used by the associated hostname.
+     * @param context An Android context.
+     * @return A formatted string of the data used.
+     */
+    public String getFormattedDataUsed(Context context) {
+        return Formatter.formatFileSize(context, mDataUsed);
+    }
+
+    /**
+     * Returns a formatted String of the data saved by the associated hostname.
+     * @param context An Android context.
+     * @return A formatted string of the data saved.
+     */
+    public String getFormattedDataSaved(Context context) {
+        return Formatter.formatFileSize(context, mOriginalSize - mDataUsed);
+    }
+}