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..177ef3a83a3806b7efed10b4a73a9a606781d638 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
@@ -11,6 +11,7 @@ import org.chromium.chrome.browser.externalnav.ExternalNavigationHandler.Overrid
 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 +24,11 @@ interface ExternalNavigationDelegate {
     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.
      */