Verify intent signatures.

chrome/android/java/src/org/chromium/chrome/browser/externalnav/ExternalNavigationDelegate.java

 // Copyright 2015 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.externalnav;
 
 import android.content.Intent;
 import android.content.pm.ResolveInfo;
 
 import org.chromium.chrome.browser.externalnav.ExternalNavigationHandler.OverrideUrlLoadingResult;
 import org.chromium.chrome.browser.tab.Tab;
 
 import java.util.List;
+import java.util.Set;
 
 /**
  * A delegate for the class responsible for navigating to external applications from Chrome. Used
  * by {@link ExternalNavigationHandler}.
  */
 interface ExternalNavigationDelegate {
     /**
      * Get the list of component name of activities which can resolve |intent|.
      */
     List<ResolveInfo> queryIntentActivities(Intent intent);
 
     /**
+     * Get all sha256 fingerprints of signature from pkgName or null on failure.
+     */
+    Set<String> getPackageSHA256Fingerprints(String pkgName);
+
+    /**
      * Determine if Chrome is the default or only handler for a given intent. If true, Chrome
      * will handle the intent when started.
      */
     boolean willChromeHandleIntent(Intent intent);
 
     /**
      * Search for intent handlers that are specific to this URL aka, specialized apps like
      * google maps or youtube
      */
     boolean isSpecializedHandlerAvailable(List<ResolveInfo> infos);
@@ skipping 86 matching lines @@
     /**
      * @return Default SMS application's package name. Null if there isn't any.
      */
     String getDefaultSmsPackageName();
 
     /**
      * @return Whether the URL is a file download.
      */
     boolean isPdfDownload(String url);
 }