[epiphany] Append '(WebappShell)' to User-Agent when running in web app mode

[Michael Catanzaro <mcatanzaro src gnome org>]

commit dc0aef57257a582ee03aa251a514349a804c6dea
Author: Daniel Aleksandersen <code daniel priv no>
Date:   Sat Jun 4 00:17:02 2016 +0200

    Append '(WebappShell)' to User-Agent when running in web app mode
    
    https://bugzilla.gnome.org/show_bug.cgi?id=767123

 embed/ephy-embed-prefs.c |   17 ++++++++++++++---
 1 files changed, 14 insertions(+), 3 deletions(-)
---
diff --git a/embed/ephy-embed-prefs.c b/embed/ephy-embed-prefs.c
index 044761f..da5635c 100644
--- a/embed/ephy-embed-prefs.c
+++ b/embed/ephy-embed-prefs.c
@@ -182,6 +182,7 @@ webkit_pref_callback_user_agent (GSettings  *settings,
                                  gpointer    data)
 {
   char *value;
+  char *user_agent;
   const char *internal_user_agent;
 
   value = g_settings_get_string (settings, key);
@@ -194,10 +195,20 @@ webkit_pref_callback_user_agent (GSettings  *settings,
 
   internal_user_agent = webkit_pref_get_internal_user_agent ();
   if (internal_user_agent)
-    webkit_settings_set_user_agent (webkit_settings, internal_user_agent);
+    user_agent = g_strdup (internal_user_agent);
   else
-    webkit_settings_set_user_agent_with_application_details (webkit_settings,
-                                                             "Epiphany", VERSION);
+    user_agent = g_strdup_printf ("%s Epiphany/%s",
+                                  webkit_settings_get_user_agent (webkit_settings),
+                                  VERSION);
+
+  if (ephy_embed_shell_get_mode (ephy_embed_shell_get_default ()) ==
+      EPHY_EMBED_SHELL_MODE_APPLICATION) {
+    char *user_agent_old = user_agent;
+    user_agent = g_strdup_printf ("%s (WebappShell)", user_agent);
+    g_free (user_agent_old);
+  }
+  webkit_settings_set_user_agent (webkit_settings, user_agent);
+  g_free (user_agent);
 }
 
 static gdouble