DevTools: NetworkRequest.asDataUrl should always use encoded content.

Otherwise URL might contain unexpectedely escaped chars.

BUG=427478

Review URL: https://codereview.chromium.org/675733004

git-svn-id: svn://svn.chromium.org/blink/trunk@184530 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: Load module scripts in parallel in the debug_devtools=1 mode

R=pfeldman

Review URL: https://codereview.chromium.org/680883002

git-svn-id: svn://svn.chromium.org/blink/trunk@184531 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: consume pending promise in all code paths that select current panel.

Review URL: https://codereview.chromium.org/678373002

git-svn-id: svn://svn.chromium.org/blink/trunk@184533 bbb929c8-8fbe-4397-9dbb-9b2b20218538