[DevTools] Added CodeGeneratorInstrumnetation full PassRefPtr support

With this patch CodeGenerator fully supports PassRefPtr. For each PassRefPtr param it generates temporary RefPtr which allows to pass PassRefPtr param to agent method without using raw pointer.

R=vsevik@chromium.org

Review URL: https://codereview.chromium.org/469073003

git-svn-id: svn://svn.chromium.org/blink/trunk@180558 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Rebaseline virtual/threaded/compositing/visibility/visibility-image-layers.html.

BUG=405031
TBR=reveman@chromium.org

Review URL: https://codereview.chromium.org/487223002

git-svn-id: svn://svn.chromium.org/blink/trunk@180559 bbb929c8-8fbe-4397-9dbb-9b2b20218538