Support the full-screen state when showing a chrome window

The SHOW_STATE_FULLSCREEN state has not been supported in Windows
so this CL implements it and allows browser_tests to pass the
test for creating a full screen extension window without manually
calling setFullscreenMode().

BUG=473228

Review URL: https://codereview.chromium.org/1138383008

Cr-Commit-Position: refs/heads/master@{#330602}
2 files changed