Add a TLD whitelist for Google Search URLs.

chrome/android/java/src/org/chromium/chrome/browser/instantapps/InstantAppsHandler.java

 // Copyright 2016 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.instantapps;
 
 import android.content.Context;
 import android.content.Intent;
 import android.net.Uri;
 import android.os.StrictMode;
@@ skipping 34 matching lines @@
 
     protected static final String IS_REFERRER_TRUSTED_EXTRA =
             "com.google.android.gms.instantapps.IS_REFERRER_TRUSTED";
 
     protected static final String IS_USER_CONFIRMED_LAUNCH_EXTRA =
             "com.google.android.gms.instantapps.IS_USER_CONFIRMED_LAUNCH";
 
     protected static final String TRUSTED_REFERRER_PKG_EXTRA =
             "com.google.android.gms.instantapps.TRUSTED_REFERRER_PKG";
 
+    public static final String IS_GOOGLE_SEARCH_REFERRER =
+            "com.google.android.gms.instantapps.IS_GOOGLE_SEARCH_REFERRER";
+
     /** Finch experiment name. */
     private static final String INSTANT_APPS_EXPERIMENT_NAME = "InstantApps";
 
     /** Finch experiment group which is enabled for instant apps. */
     private static final String INSTANT_APPS_ENABLED_ARM = "InstantAppsEnabled";
 
     /** Finch experiment group which is disabled for instant apps. */
     private static final String INSTANT_APPS_DISABLED_ARM = "InstantAppsDisabled";
 
     /** A histogram to record how long each handleIntent() call took. */
@@ skipping 18 matching lines @@
         }
         return sInstance;
     }
 
     /**
      * Check the cached value to figure out if the feature is enabled. We have to use the cached
      * value because native library hasn't yet been loaded.
      * @param context The application context.
      * @return Whether the feature is enabled.
      */
-    private boolean isEnabled(Context context) {
+    protected boolean isEnabled(Context context) {
         // Will go away once the feature is enabled for everyone by default.
         StrictMode.ThreadPolicy oldPolicy = StrictMode.allowThreadDiskReads();
         try {
             return ChromePreferenceManager.getInstance(context).getCachedInstantAppsEnabled();
         } finally {
             StrictMode.setThreadPolicy(oldPolicy);
         }
     }
 
     /**
@@ skipping 193 matching lines @@
     /**
      * Gets the instant app intent for the given URL if one exists.
      *
      * @param url The URL whose instant app this is associated with.
      * @return An instant app intent for the URL if one exists.
      */
     public Intent getInstantAppIntentForUrl(String url) {
         return null;
     }
 }