The tests are failing on this tester:
https://ci.chromium.org/buildbot/chromium.webrtc/Win10%20Tester

Example failure:
https://ci.chromium.org/buildbot/chromium.webrtc/Win10%20Tester/31713

Test keeps printing:
[8856:3560:0904/235314.295:INFO:CONSOLE(107)] "DEBUG: video.width = 2", source: http://127.0.0.1:51004/media/webrtc_test_utilities.js (107)
[8856:3560:0904/235314.295:INFO:CONSOLE(108)] "DEBUG: video.height = 2", source: http://127.0.0.1:51004/media/webrtc_test_utilities.js (108)
[8856:3560:0904/235317.495:INFO:CONSOLE(105)] "Still waiting for video to satisfy function isVideoPlaying(pixels, previousPixels) {
  for (var i = 0; i < pixels.length; i++) {
    if (pixels[i] != previousPixels[i]) {
      return true;
    }
  }
  return false;
}", source: http://127.0.0.1:51004/media/webrtc_test_utilities.js (105)

And fails:
[ RUN      ] UsingRealWebcam/WebRtcImageCaptureSucceedsBrowserTest.GetPhotoCapabilities/0
DevTools listening on ws://127.0.0.1:51139/devtools/browser/e2216745-a26b-4b3e-8d6b-648d2d8dac58
[5380:2948:0904/235440.204:INFO:content_browser_test_utils.cc(147)] Using camera HD Pro Webcam C920 (046d:082d)
[4996:9120:0904/235440.467:ERROR:validation_errors.cc(76)] Invalid message: VALIDATION_ERROR_UNEXPECTED_NULL_POINTER (null field 15)
[4996:9120:0904/235440.469:ERROR:validation_errors.cc(76)] Invalid message: VALIDATION_ERROR_UNEXPECTED_NULL_POINTER (null field 15)
../../content/browser/webrtc/webrtc_image_capture_browsertest.cc(196): error: Value of: RunImageCaptureTestCase("testCreateAndGetPhotoCapabilitiesSucceeds()")
  Actual: false
Expected: true
Stack trace:
Backtrace:
	StackTraceGetter::CurrentStackTrace [0x01E48F28+40]
	testing::internal::UnitTestImpl::CurrentOsStackTraceExceptTop [0x01E5145B+69]
	testing::internal::AssertHelper::operator= [0x01E510C0+48]
	content::WebRtcImageCaptureSucceedsBrowserTest_GetPhotoCapabilities_Test::RunTestOnMainThread [0x017B102A+170]
	content::BrowserTestBase::ProxyRunTestOnMainThreadLoop [0x02C3B785+373]
	content::ShellBrowserMainParts::PreMainMessageLoopRun [0x033BEAFD+61]
	content::BrowserMainLoop::PreMainMessageLoopRun [0x020A2FB4+68]
	content::StartupTaskRunner::RunAllTasksNow [0x0234E968+36]
	content::BrowserMainLoop::CreateStartupTasks [0x020A1C4C+554]
	content::BrowserMainRunnerImpl::Initialize [0x020A4F86+102]
	ShellBrowserMain [0x04FE5176+18]
	content::ShellMainDelegate::RunProcess [0x04FE3DA0+176]
	content::RunBrowserProcessMain [0x01FF4779+65]
	content::ContentMainRunnerImpl::Run [0x01FF4EB2+402]
	content::ContentServiceManagerMainDelegate::RunEmbedderProcess [0x01FF4443+19]
	service_manager::Main [0x030A6472+354]
	content::ContentMain [0x01FF46DF+51]
	content::BrowserTestBase::SetUp [0x02C3B51D+1549]
	content::ContentBrowserTest::SetUp [0x02C33E8F+111]
[  FAILED  ] UsingRealWebcam/WebRtcImageCaptureSucceedsBrowserTest.GetPhotoCapabilities/0, where GetParam() = (4-byte object <00-00 00-00>, 1-byte object <00>, 4-byte object <00-00 00-00>) (1032 ms)

Didn't see anything obvious in the blame list. Maybe an infra problem since the test is using a real webcam?

chfremer, could you please comment do you think this is an infra problem?