[Android WebAPKs] Add UMA metric for ShellAPK version

chrome/android/java/src/org/chromium/chrome/browser/metrics/WebApkUma.java

Index: chrome/android/java/src/org/chromium/chrome/browser/metrics/WebApkUma.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/metrics/WebApkUma.java b/chrome/android/java/src/org/chromium/chrome/browser/metrics/WebApkUma.java
index 1d4204c61e8f5aa8ba661a7b81ee270f1492c8e0..98cd80e7b4fb7bb19790ce8e9b34c5cc6a1514d7 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/metrics/WebApkUma.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/metrics/WebApkUma.java
@@ -5,6 +5,7 @@
 package org.chromium.chrome.browser.metrics;
 
 import org.chromium.base.metrics.RecordHistogram;
+import org.chromium.webapk.lib.common.WebApkConstants;
 
 import java.util.concurrent.TimeUnit;
 
@@ -95,4 +96,12 @@ public class WebApkUma {
         RecordHistogram.recordLongTimesHistogram(
                 "WebApk.Session.TotalDuration", duration, TimeUnit.MILLISECONDS);
     }
+
+    /** Records the current Shell APK version. */
+    public static void recordShellApkVersion(int shellApkVersion, String packageName) {
+        String name = packageName.startsWith(WebApkConstants.WEBAPK_PACKAGE_PREFIX)
+                ? "WebApk.ShellApkVersion.BrowserApk"
+                : "WebApk.ShellApkVersion.UnboundApk";
+        RecordHistogram.recordCountHistogram(name, shellApkVersion);

[Ilya Sherman, 2017/05/04 19:55:08]

This probably makes more sense as a sparse histogram, since you probably want to
see individual version numbers.

[pkotwicz, 2017/05/05 21:26:24]

Good point! Changed.

+    }
 }