commit 5014ab0d6b767a71e555d8764939f403c2c52a7c
author reillyg@chromium.org <reillyg@chromium.org> Wed Sep 16 01:40:28 2015
committer reillyg@chromium.org <reillyg@chromium.org> Wed Sep 16 01:40:28 2015
tree ca62ab45580459274359b1f85a52e881a2ffbf03
parent ca44271bf3e2cf608a60f9ef123ba74f4b9ef7fd

Implement USB connection events through the WebUSB client interface.

This patch adds an observer to WebUSBClient so that the embeder can
provide device connect and disconnect events. This interface is then
used to dispatch these events.

WebUSBClient::setObserver can be made a pure virtual function once
Chrome's WebUSBClientImpl implements it.

BUG=492204

Review URL: https://codereview.chromium.org/1340523004

git-svn-id: svn://svn.chromium.org/blink/trunk@202309 bbb929c8-8fbe-4397-9dbb-9b2b20218538