Convert debugger settings controls to combo boxes.

This reduces the height of the settings panel significantly compared to
radio buttons.

With some luck, the debugger may now fit on non-4K monitors :)

R=bungeman@google.com, robertphillips@google.com

Author: fmalita@chromium.org

Review URL: https://codereview.chromium.org/78843005

git-svn-id: http://skia.googlecode.com/svn/trunk@12342 2bbb7eff-a529-9590-31e7-b0007b416f81
3 files changed