Refactor Vr activity into ChromeTabbedActivity.

chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellInterface.java

Index: chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellInterface.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellInterface.java b/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellInterface.java
new file mode 100644
index 0000000000000000000000000000000000000000..83c9fe37c9ab375a8c20b8d62f38cebec31f0dae
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellInterface.java
@@ -0,0 +1,43 @@
+// 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.chrome.browser.vr_shell;
+
+import android.widget.FrameLayout;
+
+/**
+ * Abstracts away the VrShell class, which may or may not be present at runtime depending on
+ * compile flags.
+ */
+public interface VrShellInterface {
+    /**
+     * Performs native VrShell initialization.
+     */
+    void onNativeLibraryReady();
+
+    /**
+     * Pauses VrShell.
+     */
+    void pause();
+
+    /**
+     * Resumes VrShell.
+     */
+    void resume();
+
+    /**
+     * Destroys VrShell.
+     */
+    void teardown();
+
+    /**
+     * Sets Android VR Mode to |enabled|.
+     */
+    void setVrModeEnabled(boolean enabled);
+
+    /**
+     * Returns the GVRLayout as a FrameLayout.
+     */
+    FrameLayout getContainer();
+}