Add tests for the new WebView error reporting APIs

The new callbacks are:
  -- WebViewClient.onReceivedError(WebView, WebResourceRequest,
             WebResourceError)
  -- WebViewClient.onReceivedHttpError(WebView, WebResourceRequest,
             WebResourceResponseBase)

Bug: 19313118
Change-Id: I8b519be24d2ddf1d1957e02d91aebddea89faefd
3 files changed