[WebRTC] A real ScreenCapturer test
We do not have a real ScreenCapturer test before. And after CL 2210443002, a new
ScreenDrawer interface is added to the code base to draw various shapes on the
screen. This change is to use ScreenDrawer to test ScreenCapturer. Besides test
cases, some other changes are included,
1. A WaitForPendingPaintings() function in ScreenDrawer, to wait for a
ScreenDrawer to finish all the pending draws. This function now only sleeps 50
milliseconds on X11 and 100 milliseconds on Windows.
2. A Color structure to help handle a big-endian or little-endian safe color and
provide functions to compare with DesktopFrame::data(). Both ScreenDrawer and
DesktopFrameGenerator (in change 2202443002) can use this class to create colors
and compare with or paint to a DesktopFrame.
3. ScreenDrawer now uses Color structure instead of uint32_t.
BUG=314516
TBR=kjellander@chromium.org
Review-Url: https://codereview.webrtc.org/2268093002
Cr-Original-Commit-Position: refs/heads/master@{#14058}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 9d1c54ace0dc9f68da0152aa1ded2a8dba0a43ae
9 files changed
