[Android WebViewShell] Add support for running (some) blink layout tests in WebViewShell.
This patch does the following:
- adds framework support for running a subset of blink layout tests in the webview shell
- adds 2 sample tests, one of which tests the global interface exposed in webview
- adds functionality to rebase the tests
- adds a script to run the tests on an android device
The testing works similarly to layout testing in blink in that a html file is loaded
using webview which executes some JavaScript. The latter generates textual output and
the result is compared against an expectations file.
BUG=497861
Review URL: https://codereview.chromium.org/
1161993008
Cr-Commit-Position: refs/heads/master@{#336361}