Photo Picker dialog: Add UMA statistics.

chrome/android/java/src/org/chromium/chrome/browser/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;

[Ted C, 2017/06/02 16:16:40]

let's put this in the chrome.browser.util package

Ideally, the top level browser package gets smaller over time and not larger

+
+/**
+ * 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;
+}