Implement lazy initialization for VrShellDelegate

chrome/android/javatests/src/org/chromium/chrome/browser/vr_shell/WebVrTest.java

 // 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 static org.chromium.chrome.test.util.ChromeRestriction.RESTRICTION_TYPE_DAYDREAM_VIEW;
 import static org.chromium.chrome.test.util.ChromeRestriction.RESTRICTION_TYPE_WEBVR_SUPPORTED;
 
 import android.support.test.filters.SmallTest;
@@ skipping 209 matching lines @@
 
     /**
      * Tests that a successful requestPresent call actually enters VR
      */
     @SmallTest
     public void testRequestPresentEntersVr() throws InterruptedException {
         String testName = "test_requestPresent_enters_vr";
         loadUrl(getHtmlTestFile(testName), 10);
         assertTrue("VRDisplay found", vrDisplayFound(mWebContents));
         enterVrTapAndWait(mWebContents);
-        assertTrue("VrShellDelegate is in VR", getActivity().getVrShellDelegate().isInVR());
+        assertTrue("VrShellDelegate is in VR", VrShellDelegate.isInVR());
         endTest(mWebContents);
     }
 
     /**
      * Tests that scanning the Daydream View NFC tag on supported devices
      * fires the onvrdisplayactivate event.
      */
     @SmallTest
     @Restriction(RESTRICTION_TYPE_DAYDREAM_VIEW)
     public void testNfcFiresOnvrdisplayactivate() throws InterruptedException {
@@ skipping 12 matching lines @@
         loadUrl(getHtmlTestFile(testName), 10);
         assertTrue("VRDisplay found", vrDisplayFound(mWebContents));
         executeStepAndWait("stepCheckFrameDataWhileFocusedTab()", mWebContents);
 
         loadUrlInNewTab("about:blank");
 
         executeStepAndWait("stepCheckFrameDataWhileNonFocusedTab()", mWebContents);
         endTest(mWebContents);
     }
 }