Merge cherrypicks of [18281033] into security-aosp-qt-release.

Change-Id: I5ad10652e4ba23d30bacccd917354f4095f7aa7c
diff --git a/src/com/android/keychain/KeyChainActivity.java b/src/com/android/keychain/KeyChainActivity.java
index f8cb0d3..e8bc1e7 100644
--- a/src/com/android/keychain/KeyChainActivity.java
+++ b/src/com/android/keychain/KeyChainActivity.java
@@ -372,7 +372,7 @@
         Uri uri = getIntent().getParcelableExtra(KeyChain.EXTRA_URI);
         if (uri != null) {
             String hostMessage = String.format(res.getString(R.string.requesting_server),
-                                               uri.getAuthority());
+                    Uri.encode(uri.getAuthority(), "$,;:@&=+"));
             if (contextMessage == null) {
                 contextMessage = hostMessage;
             } else {