Logic for the Data Saver InfoBar Promo

chrome/android/java/src/org/chromium/chrome/browser/omaha/VersionNumberGetter.java

Index: chrome/android/java/src/org/chromium/chrome/browser/omaha/VersionNumberGetter.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/omaha/VersionNumberGetter.java b/chrome/android/java/src/org/chromium/chrome/browser/omaha/VersionNumberGetter.java
index f6a47daa2cb84061dda32dd60b54167be6de70b1..447892042948e69a7cc238d0abc945db96dfd3a2 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/omaha/VersionNumberGetter.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/omaha/VersionNumberGetter.java
@@ -34,4 +34,31 @@ public class VersionNumberGetter {
     public String getCurrentlyUsedVersion(Context context) {
         return BuildInfo.getPackageVersionName(context);
     }
+
+    /**
+     * Gets the milestone from an AboutVersionStrings#getApplicationVersion string. These strings
+     * are of the format "ProductName xx.xx.xx.xx".
+     *
+     * @param version The version to extract the milestone number from.
+     * @return The milestone of the given version string.
+     */
+    public static int getMilestoneFromVersionNumber(String version) {
+        if (version.isEmpty()) {
+            throw new IllegalArgumentException("Application version incorrectly formatted");
+        }
+
+        version = version.replaceAll("[^\\d.]", "");
+
+        // Parse out the version numbers.
+        String[] pieces = version.split("\\.");
+        if (pieces.length != 4) {
+            throw new IllegalArgumentException("Application version incorrectly formatted");
+        }
+
+        try {
+            return Integer.parseInt(pieces[0]);
+        } catch (NumberFormatException e) {
+            throw new IllegalArgumentException("Application version incorrectly formatted");
+        }
+    }
 }