Verify intent signatures.

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

Index: chrome/android/java/src/org/chromium/chrome/browser/externalnav/ExternalNavigationDelegate.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/externalnav/ExternalNavigationDelegate.java b/chrome/android/java/src/org/chromium/chrome/browser/externalnav/ExternalNavigationDelegate.java
index c8a0ab55efbf639fec033ed9b33ed9cc6b8daed4..785dd3e5c9926473a291487c48ef7c7a93e05996 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/externalnav/ExternalNavigationDelegate.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/externalnav/ExternalNavigationDelegate.java
@@ -3,14 +3,15 @@
 // found in the LICENSE file.
 
 package org.chromium.chrome.browser.externalnav;
-
 import android.content.Intent;
+import android.content.pm.PackageManager;
 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
@@ -23,6 +24,12 @@ interface ExternalNavigationDelegate {
     List<ResolveInfo> queryIntentActivities(Intent intent);
 
     /**
+     * Get all sha256 fingerprints of signature from pkgName.
+     */
+    Set<String> getPackageSHA256Fingerprints(String pkgName)
+            throws PackageManager.NameNotFoundException;
+
+    /**
      * Determine if Chrome is the default or only handler for a given intent. If true, Chrome
      * will handle the intent when started.
      */