[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-Commit-Position: refs/heads/master@{#14058}
9 files changed
tree: 17c8a3c9899ecc5fb9947e68dacb4caf24ab3f48
  1. build_overrides/
  2. chromium/
  3. data/
  4. infra/
  5. resources/
  6. third_party/
  7. tools/
  8. webrtc/
  9. .clang-format
  10. .gitignore
  11. .gn
  12. all.gyp
  13. AUTHORS
  14. BUILD.gn
  15. check_root_dir.py
  16. codereview.settings
  17. DEPS
  18. LICENSE
  19. license_template.txt
  20. LICENSE_THIRD_PARTY
  21. OWNERS
  22. PATENTS
  23. PRESUBMIT.py
  24. pylintrc
  25. README.md
  26. setup_links.py
  27. sync_chromium.py
  28. WATCHLISTS
README.md

WebRTC is a free, open software project that provides browsers and mobile applications with Real-Time Communications (RTC) capabilities via simple APIs. The WebRTC components have been optimized to best serve this purpose.

Our mission: To enable rich, high-quality RTC applications to be developed for the browser, mobile platforms, and IoT devices, and allow them all to communicate via a common set of protocols.

The WebRTC initiative is a project supported by Google, Mozilla and Opera, amongst others. This page is maintained by the Google Chrome team.

Development

See http://www.webrtc.org/native-code/development for instructions on how to get started developing with the native code.

More info