Use PythonSytaxHighlighter only when Python is enabled.

Change-Id: Icf8837924ecbd5632658a585edad85eb9d2063f4
Merge topic 'pyhton_highlighting_for_python_cue' into next

e49b69fb Use PythonSytaxHighlighter only when Python is enabled.
Add Python syntax coloring to PythonAnimationCue editor.

Change-Id: Ie263bc5c0100e42ac86041692561c2c6d728d5a5
Merge topic 'pyhton_highlighting_for_python_cue' into next

a109edec Add Python syntax coloring to PythonAnimationCue editor.