ui: Cleanup class/struct forward declarations

blimp/client/core/settings/android/java/src/org/chromium/blimp/core/settings/SettingsObserver.java

Index: blimp/client/core/settings/android/java/src/org/chromium/blimp/core/settings/SettingsObserver.java
diff --git a/blimp/client/core/settings/android/java/src/org/chromium/blimp/core/settings/SettingsObserver.java b/blimp/client/core/settings/android/java/src/org/chromium/blimp/core/settings/SettingsObserver.java
new file mode 100644
index 0000000000000000000000000000000000000000..69087e37df35d92b53312fefbdc8485c462334d5
--- /dev/null
+++ b/blimp/client/core/settings/android/java/src/org/chromium/blimp/core/settings/SettingsObserver.java
@@ -0,0 +1,34 @@
+// Copyright 2016 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.blimp.core.settings;
+
+/**
+ * SettingsObserver is the Java representation of a native SettingsObserver object.
+ *
+ * The SettingsObserver is an observer API implemented by classes which are interested in
+ * various events related to {@link Settings}.
+ */
+public interface SettingsObserver {
+    /**
+     * Invoked when enabling or disabling Blimp mode in the Settings.
+     */
+    void onBlimpModeEnabled(boolean enable);
+
+    /**
+     * Invoked when enabling or disabling to show the network stats in the Settings.
+     */
+    void onShowNetworkStatsChanged(boolean enable);
+
+    /**
+     * Invoked when enabling or disabling to download the whole document in the Settings.
+     */
+    void onRecordWholeDocumentChanged(boolean enable);
+
+    /**
+     * Invoked when a setting changed that requires the application to restart before it can take
+     * effect.
+     */
+    void onRestartRequired();
+}