Switch tabs from VR shell.

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 51c48a4d820c67f250d8727f0a238473accb06ce..8fd4516c6a8bc32109d3ae817eeb7ab05c36031d 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
@@ -35,6 +35,8 @@ import org.chromium.chrome.browser.ChromeFeatureList;
 import org.chromium.chrome.browser.ChromeTabbedActivity;
 import org.chromium.chrome.browser.multiwindow.MultiWindowUtils;
 import org.chromium.chrome.browser.tab.Tab;
+import org.chromium.chrome.browser.tabmodel.TabModel;
+import org.chromium.chrome.browser.tabmodel.TabModelUtils;
 
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
@@ -627,6 +629,19 @@ public class VrShellDelegate {
         return mNativeVrShellDelegate;
     }
 
+    @CalledByNative
+    private void showTab(int id) {
+        Tab tab = mActivity.getTabModelSelector().getTabById(id);
+        if (tab == null) {
+            return;
+        }
+        int index = mActivity.getTabModelSelector().getModel(tab.isIncognito()).indexOf(tab);
+        if (index == TabModel.INVALID_TAB_INDEX) {
+            return;
+        }
+        TabModelUtils.setIndex(mActivity.getTabModelSelector().getModel(tab.isIncognito()), index);
+    }
+
     private native long nativeInit();
     private native void nativeSetPresentResult(long nativeVrShellDelegate, boolean result);
     private native void nativeDisplayActivate(long nativeVrShellDelegate);