[vr] Show DOFF when starting Chrome with a VR intent without FRE completion

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 231e66c2be535904305c99d43281b289ea842a9f..d824cb229fbfcf2d8b4d3b1e6ffeca0d7dec3bc4 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
@@ -94,6 +94,7 @@ public class VrShellDelegate implements ApplicationStatus.ActivityStateListener,
 
     private static final String DAYDREAM_VR_EXTRA = "android.intent.extra.VR_LAUNCH";
     private static final String DAYDREAM_HOME_PACKAGE = "com.google.android.vr.home";
+    static final String VR_FRE_INTENT_EXTRA = "org.chromium.chrome.browser.vr_shell.VR_FRE";
 
     // Linter and formatter disagree on how the line below should be formatted.
     /* package */
@@ -420,7 +421,7 @@ public class VrShellDelegate implements ApplicationStatus.ActivityStateListener,
     }
 
     @SuppressWarnings("unchecked")
-    private static VrClassesWrapper createVrClassesWrapper() {
+    /* package */ static VrClassesWrapper createVrClassesWrapper() {
         try {
             Class<? extends VrClassesWrapper> vrClassesBuilderClass =
                     (Class<? extends VrClassesWrapper>) Class.forName(
@@ -484,6 +485,13 @@ public class VrShellDelegate implements ApplicationStatus.ActivityStateListener,
         return ChromeFeatureList.isEnabled(ChromeFeatureList.VR_SHELL);
     }
 
+    /**
+     *  @return Whether or not VR is supported on this platform.
+     */
+    private static boolean isVrEnabled() {
+        return getVrClassesWrapper() != null;
+    }
+
     private class VSyncEstimator {
         private static final long NANOS_PER_SECOND = 1000000000;
 
@@ -869,6 +877,20 @@ public class VrShellDelegate implements ApplicationStatus.ActivityStateListener,
         }
     }
 
+    /**
+     * @return An intent that will launch a VR activity that will prompt the
+     * user to take off their headset and foward the freIntent to the standard
+     * 2D FRE activity.
+     */
+    public static Intent setupVrFreIntent(Context context, Intent freIntent) {
+        if (!isVrEnabled()) return freIntent;
+        Intent intent = new Intent();
+        intent.setClassName(context, VrFirstRunActivity.class.getName());
+        intent.putExtra(VR_FRE_INTENT_EXTRA, new Intent(freIntent));
+        intent.putExtra(DAYDREAM_VR_EXTRA, true);
+        return intent;
+    }
+
     /**
      * @return Whether or not the given intent is a VR-specific intent.
      */
@@ -876,6 +898,13 @@ public class VrShellDelegate implements ApplicationStatus.ActivityStateListener,
         return IntentUtils.safeGetBooleanExtra(intent, DAYDREAM_VR_EXTRA, false);
     }
 
+    /*
+     * Remove VR-specific extras from the given intent.
+     */
+    public static void removeVrExtras(Intent intent) {
+        intent.removeExtra(DAYDREAM_VR_EXTRA);
+    }
+
     /**
      * @return Options that a VR-specific Chrome activity should be launched with.
      */