Update from https://crrev.com/327068

base/android/java/src/org/chromium/base/metrics/RecordUserAction.java

Index: base/android/java/src/org/chromium/base/metrics/RecordUserAction.java
diff --git a/base/android/java/src/org/chromium/base/metrics/RecordUserAction.java b/base/android/java/src/org/chromium/base/metrics/RecordUserAction.java
new file mode 100644
index 0000000000000000000000000000000000000000..d7cc32c2b2f7cb42668667dead8916b7e0881c8b
--- /dev/null
+++ b/base/android/java/src/org/chromium/base/metrics/RecordUserAction.java
@@ -0,0 +1,36 @@
+// Copyright 2015 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.base.metrics;
+
+import org.chromium.base.JNINamespace;
+import org.chromium.base.ThreadUtils;
+
+/**
+ * Java API for recording UMA actions.
+ *
+ * WARNINGS:
+ * JNI calls are relatively costly - avoid using in performance-critical code.
+ *
+ * We use a script (extract_actions.py) to scan the source code and extract actions. A string
+ * literal (not a variable) must be passed to record().
+ */
+@JNINamespace("base::android")
+public class RecordUserAction {
+    public static void record(final String action) {
+        if (ThreadUtils.runningOnUiThread()) {
+            nativeRecordUserAction(action);
+            return;
+        }
+
+        ThreadUtils.runOnUiThread(new Runnable() {
+            @Override
+            public void run() {
+                nativeRecordUserAction(action);
+            }
+        });
+    }
+
+    private static native void nativeRecordUserAction(String action);
+}