[Cronet] Continue UrlRequest with NULL certificate if Client cert is requested.

components/cronet/android/test/src/org/chromium/net/MockUrlRequestJobFactory.java

Index: components/cronet/android/test/src/org/chromium/net/MockUrlRequestJobFactory.java
diff --git a/components/cronet/android/test/src/org/chromium/net/MockUrlRequestJobFactory.java b/components/cronet/android/test/src/org/chromium/net/MockUrlRequestJobFactory.java
index 505db12d415976566576c716e37f46644f81d496..69a024401e2a06a9c215f08b44dc36bdba42bb69 100644
--- a/components/cronet/android/test/src/org/chromium/net/MockUrlRequestJobFactory.java
+++ b/components/cronet/android/test/src/org/chromium/net/MockUrlRequestJobFactory.java
@@ -54,6 +54,14 @@ public final class MockUrlRequestJobFactory {
     }
 
     /**
+     * Constructs a mock URL that will request client certificate and return
+     * the string "data" as the response.
+     */
+    public static String getMockUrlForClientCertificateRequest() {
+        return nativeGetMockUrlForClientCertificateRequest();
+    }
+
+    /**
      * Constructs a mock URL that will fail with an SSL certificate error.
      */
     public static String getMockUrlForSSLCertificateError() {
@@ -67,5 +75,7 @@ public final class MockUrlRequestJobFactory {
     private static native String nativeGetMockUrlForData(String data,
             int dataRepeatCount);
 
+    private static native String nativeGetMockUrlForClientCertificateRequest();
+
     private static native String nativeGetMockUrlForSSLCertificateError();
 }