add find-result-selected-color pref

Find result selected color pref will set the highlight color of the
selected find result.

Change-Id: I167afbbef42bdc1b614412b50063cd4e3471c042
Reviewed-on: https://chromium-review.googlesource.com/c/apps/libapps/+/2299924
Reviewed-by: Joel Hockey <joelhockey@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>
diff --git a/hterm/js/hterm_terminal.js b/hterm/js/hterm_terminal.js
index fca1f12..0a14da8 100644
--- a/hterm/js/hterm_terminal.js
+++ b/hterm/js/hterm_terminal.js
@@ -488,6 +488,10 @@
       terminal.findBar.setFindResultColor(v);
     },
 
+    'find-result-selected-color': function(v) {
+      terminal.findBar.setFindResultSelectedColor(v);
+    },
+
     'font-family': function(v) {
       terminal.syncFontFamily();
     },