- Support runtime configuration of renderer-related preferences (issue #1501).

- Persist modified user preferences including per-host zoom settings when a
  cache_path value is specified and persist_user_preferences is set to true
  via CefSettings or CefRequestContextSettings.
- Avoid the need to duplicate files from chrome/ by having CefBrowserContext
  extend Chrome's Profile class.

tests/cefclient/browser/preferences_test.cc

@@ -196,6 +196,11 @@ class Handler : public CefMessageRouterBrowserSide::Handler {
         command_line->HasSwitch("proxy-pac-url") ||
         command_line->HasSwitch("proxy-server"));
 
+    // If allow running insecure content is enabled via the command-line then it
+    // cannot be enabled via preferences.
+    dict->SetBool("allow_running_insecure_content",
+        command_line->HasSwitch("allow-running-insecure-content"));
+
     // Serialize the state to JSON and return to the JavaScript caller.
     callback->Success(GetJSON(dict));
   }