This patch:
* unifies assets between tests
* enables a few puppeteer tests on Puppeteer-Firefox
Drive-by: beautify failing output of `expect.toEqual` matcher.
References #3889
Scrollbars look different on different platforms, so must be made invisible in tests. As a drive-by, xdescribe was broken with the new test runner.
References #2524
This patch implements FrameManager which is responsible for maintaining
the frame tree. FrameManager is quite basic: it sends FrameAttached,
FrameDetached and FrameNavigated events, and can report mainFrame and
all frames.
The next step would be moving certain Page API's to the Frame. For
example, such method as Page.evaluate, Page.navigate and others should
be available on Frame object as well.
References #4