Insulate the legacy Android client auth code from OpenSSL ABI changes.

net/android/java/src/org/chromium/net/AndroidKeyStore.java

Index: net/android/java/src/org/chromium/net/AndroidKeyStore.java
diff --git a/net/android/java/src/org/chromium/net/AndroidKeyStore.java b/net/android/java/src/org/chromium/net/AndroidKeyStore.java
index 8c85a47a869e9443fd0120dc670f1ce6015b66f6..3c7e6fc68d0630ab4abf95ee700e972ec8ff00c4 100644
--- a/net/android/java/src/org/chromium/net/AndroidKeyStore.java
+++ b/net/android/java/src/org/chromium/net/AndroidKeyStore.java
@@ -138,6 +138,19 @@ public interface AndroidKeyStore {
     long getOpenSSLHandleForPrivateKey(AndroidPrivateKey key);
 
     /**
+     * Return the OpenSSLEngine object corresponding to a given PrivateKey
+     * object.
+     *
+     * This shall only be used for Android 4.1 to work around a platform bug.
+     * See https://crbug.com/381465.
+     *
+     * @param key The PrivateKey handle.
+     * @return The OpenSSLEngine object (or null if not available)
+     */
+    @CalledByNative
+    Object getOpenSSLEngineForPrivateKey(AndroidPrivateKey key);
+
+    /**
      * Called when the native OpenSSL engine no longer needs access to the underlying key.
      */
     @CalledByNative