Enable WebVR presentation from Chrome Custom Tab

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

Index: chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrProxyActivity.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrProxyActivity.java b/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrProxyActivity.java
new file mode 100644
index 0000000000000000000000000000000000000000..2ff0826d4993426ed49bd37c77bf7042c2770a3a
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrProxyActivity.java
@@ -0,0 +1,36 @@
+// Copyright 2017 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.Activity;
+import android.content.Intent;
+import android.os.Bundle;
+
+import org.chromium.base.Log;
+
+/**
+ * Dispatches incoming intents to the appropriate VR activity based on the VR intent extras.
+ */
+public class VrProxyActivity extends Activity {
+    private static final String TAG = "VrProxyActivity";
+
+    // The permission is required for listening for VR DON flow results.
+    private static final String PERMISSION_VR_ENTRY = "VR_ENTRY";
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        int target = getIntent().getIntExtra(VrShellDelegate.TARGET_EXTRA, -1);
+        if (target == -1) {
+            Log.e(TAG, "Failed to enter VR");
+            finish();
+            return;
+        }
+        Intent intent = new Intent(VrShellDelegate.VR_ENTRY_RESULT_ACTION);
+        intent.putExtra(VrShellDelegate.TARGET_EXTRA, target);
+        sendBroadcast(intent, getPackageName() + ".permission." + PERMISSION_VR_ENTRY);
+        finish();
+    }
+}