various fixes for browser test harness
* the definitive way to determine page load finish seems to be
onPageLoadFinished AND onProgressChanged==100, changing test
harness logic to reflect that
* webview does not seem to be happen if ClearCache is called too
often (or for certain pages?). It may complain that failed to
delete blahblah, then the test harness goes crazy. So changing
cache clear to after an entire iteration of web pages have been
loaded
* browser will load default home page, which may be disruptive
to the page load process. So for the test, the browser is now
started with initial intent to visit about:blank, which does
not trigger any page load at all
Change-Id: I1cfbd8d0196a05caea6a1c5137f45f1f59cc4c5f
1 file changed