Photo Picker dialog: Add UMA statistics.

chrome/android/java/src/org/chromium/chrome/browser/util/ConversionUtils.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.util;
+
+/**
+ * A class containing some utility static methods for common conversions.
+ */
+public class ConversionUtils {
+    public static final int BYTES_PER_KILOBYTE = 1024;
+    public static final int BYTES_PER_MEGABYTE = 1024 * 1024;
+    public static final int BYTES_PER_GIGABYTE = 1024 * 1024 * 1024;
+
+    public static long bytesToKilobytes(long bytes) {
+        return bytes / BYTES_PER_KILOBYTE;
+    }
+
+    public static long bytesToMegabytes(long bytes) {
+        return bytes / BYTES_PER_MEGABYTE;
+    }
+
+    public static long bytesToGigabytes(long bytes) {
+        return bytes / BYTES_PER_GIGABYTE;
+    }
+}