Move remaining files in core/platform/graphics root directory.

And move the text-related classes to text.

Also some cleanup of gyp files to remove no-longer-needed conditions.

And some fixes for pre-submit issues.

Only filters remains.

R=abarth@chromium.org, senorblanco@chromium.org
BUG=303332

Review URL: https://codereview.chromium.org/110613002

git-svn-id: svn://svn.chromium.org/blink/trunk@163458 bbb929c8-8fbe-4397-9dbb-9b2b20218538