Upstream oodles of Chrome for Android code into Chromium.

chrome/android/java_staging/src/org/chromium/chrome/browser/widget/findinpage/FindToolbarObserver.java

+// 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.chrome.browser.widget.findinpage;
+
+/**
+ * Observer for find in page actions.
+ */
+public class FindToolbarObserver {
+
+    /**
+     * Notified when the find in page toolbar has been shown.
+     */
+    public void onFindToolbarShown() {
+    }
+
+    /**
+     * Notified when the find in page toolbar has been hidden.
+     */
+    public void onFindToolbarHidden() {
+    }
+
+}