Swap to foreground tab when following links that open in a new tab/window in VR Shell.

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

Index: chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShell.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShell.java b/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShell.java
index ae07fdaff983f393b13da69affc437a4bc1682f8..8d1de1fd5458e7b4529b1647a5b6a63a09e25949 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShell.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShell.java
@@ -19,6 +19,11 @@ public interface VrShell {
     void initializeNative(Tab currentTab, VrShellDelegate delegate, boolean forWebVR);
 
     /**
+     * Swaps to the designated tab.
+     */
+    void swapTab(Tab currentTab);
+
+    /**
      * Pauses VrShell.
      */
     void pause();