This change adds a new directory of tests for the WebView, WebViewTests.
It also provides the first in a set of tests to test WebView's Java Bridge.
Once this set of tests is complete, the Java Bridge test in
packages/apps/Browser will be removed.
Bug: 5140673
Change-Id: I32b7fdc0ac5d2231e6b96ff232d336ad2c0fcaab