DevTools: [CodeMirror] fix enter behaviour

This patch fixes indentation problems that happen when selection
spans over multiple lines and user hits enter.

BUG=

Review URL: https://chromiumcodereview.appspot.com/18991003

git-svn-id: svn://svn.chromium.org/blink/trunk@153887 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Ensure correct positioning of autosized markers in <ol> and <ul> lists.

This patch adds an extra offset to the autosized <ol>, <ul> lists to ensure that the bullets and numbers are entirely visible and are not chopped off.

BUG=135995,135870

Review URL: https://chromiumcodereview.appspot.com/18116002

git-svn-id: svn://svn.chromium.org/blink/trunk@153888 bbb929c8-8fbe-4397-9dbb-9b2b20218538