[Android WebView] Add simple support for remote web debugging

This is a non-final way of exposing web debugging for WebView,
but it is extremely useful for anyone who needs to debug its
web content in the new version of WebView.

This patch unconditionally exposes 'webview_devtools_remote_<pid>'
linux abstract socket for remote debugging. The DevTools frontend
is already being bundled with WebView, so this patch doesn't add
any new resources.

Review URL: https://codereview.chromium.org/12378011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@185543 0039d316-1c4b-4281-b951-d872f2087c98
5 files changed