Launch Chrome when phone inserted into Daydream headset IFF Chrome was the active app

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

Index: chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrDaydreamApi.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrDaydreamApi.java b/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrDaydreamApi.java
new file mode 100644
index 0000000000000000000000000000000000000000..e95ee912e52449ce92d0fcf7ebf6fddb21521273
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrDaydreamApi.java
@@ -0,0 +1,28 @@
+// 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.app.PendingIntent;
+
+/**
+ * Abstract away DaydreamImpl class, which may or may not be present at runtime depending on compile
+ * flags.
+ */
+public interface VrDaydreamApi {
+    /**
+     * Register the intent to launch after phone inserted into a Daydream viewer.
+     */
+    void registerDaydreamIntent(PendingIntent pendingIntent);
+
+    /**
+     * Unregister the intent if any.
+     */
+    void unregisterDaydreamIntent();
+
+    /**
+     * Close the private api.
+     */
+    void close();
+}