Make VR screen tap tests more stable

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

Index: chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellDelegate.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellDelegate.java b/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellDelegate.java
index af104f87ea807d8484f72366883393b6cf7b2f52..0fb7baec2f5c99cccae6252b9018bcd4fdb19ec9 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellDelegate.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellDelegate.java
@@ -791,6 +791,14 @@ public class VrShellDelegate implements ApplicationStatus.ActivityStateListener
     }
 
     /**
+     * @return The VrShell for the VrShellDelegate instance
+     */
+    @VisibleForTesting
+    public static VrShell getVrShellForTesting() {
+        return sInstance == null ? null : sInstance.mVrShell;
+    }
+
+    /**
      * @return Pointer to the native VrShellDelegate object.
      */
     @CalledByNative