DevTools: move progress indicator to shadow dom.

BUG=417275
R=apavlov@chromium.org

Review URL: https://codereview.chromium.org/741063002

git-svn-id: svn://svn.chromium.org/blink/trunk@185779 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: move deep styles essential to all components into inspectorCommon.css

BUG=417275
R=apavlov@chromium.org

Review URL: https://codereview.chromium.org/744573003

git-svn-id: svn://svn.chromium.org/blink/trunk@185782 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: RequestView: persist "expanded" state for info categories.

It will improve UX for developers who are looking through a list of requests.

BUG=422001

Review URL: https://codereview.chromium.org/735333002

git-svn-id: svn://svn.chromium.org/blink/trunk@185783 bbb929c8-8fbe-4397-9dbb-9b2b20218538