Some logs:

For imagecapture/MediaStreamTrack-applyConstraints.html:

14:21:25.701 5894 Retrying 2 unexpected failures, attempt 1 of 3...
14:21:25.703 5894 Sharding tests ...
14:21:25.703 5894 Starting 2 workers ...
14:21:25.713 20384 worker/1 starting
14:21:25.710 20381 worker/0 starting
14:21:27.820 20384 renderer crash, pid = None, error_line = #CRASHED - renderer
14:21:27.820 20384 killed pid 20386
14:21:27.822 20384 worker/1 imagecapture/MediaStreamTrack-applyConstraints.html crashed, (stderr lines):
14:21:27.822 20384   [20386:20429:0720/142127.397063:15147814606:ERROR:devtools_http_handler.cc(786)] 
14:21:27.822 20384   DevTools listening on 127.0.0.1:43358
14:21:27.822 20384   
14:21:27.822 20384   Xlib:  extension "RANDR" missing on display ":100".
14:21:27.822 20384   Failed to tell parent about crash.
14:21:27.822 20384   Received signal 11 SEGV_ACCERR 6140002a0000
14:21:27.822 20384   #0 0x0000004816b1 (/b/s/w/ir/out/Release/content_shell+0x4816b0)
14:21:27.822 20384   #1 0x0000048281fc (/b/s/w/ir/out/Release/content_shell+0x48281fb)
14:21:27.822 20384   #2 0x00000482719d (/b/s/w/ir/out/Release/content_shell+0x482719c)
14:21:27.822 20384   #3 0x7f6d35983cb0 (/lib/x86_64-linux-gnu/libc-2.19.so+0x36caf)
14:21:27.822 20384   #4 0x000007058206 (/b/s/w/ir/out/Release/content_shell+0x7058205)
14:21:27.822 20384   #5 0x0000070293c5 (/b/s/w/ir/out/Release/content_shell+0x70293c4)
14:21:27.822 20384   #6 0x00000701ec8b (/b/s/w/ir/out/Release/content_shell+0x701ec8a)
14:21:27.822 20384   #7 0x00000b70a3a4 (/b/s/w/ir/out/Release/content_shell+0xb70a3a3)
14:21:27.822 20384   #8 0x0000098e86a2 (/b/s/w/ir/out/Release/content_shell+0x98e86a1)
14:21:27.822 20384   #9 0x0000098e97ea (/b/s/w/ir/out/Release/content_shell+0x98e97e9)
14:21:27.822 20384   #10 0x00000a67c267 (/b/s/w/ir/out/Release/content_shell+0xa67c266)
14:21:27.822 20384   #11 0x00000a09fc08 (/b/s/w/ir/out/Release/content_shell+0xa09fc07)
14:21:27.822 20384   #12 0x00000a6db300 (/b/s/w/ir/out/Release/content_shell+0xa6db2ff)
14:21:27.822 20384   #13 0x00000a779767 (/b/s/w/ir/out/Release/content_shell+0xa779766)
14:21:27.822 20384   #14 0x00000a77adbe (/b/s/w/ir/out/Release/content_shell+0xa77adbd)
14:21:27.822 20384   #15 0x00000a77adbe (/b/s/w/ir/out/Release/content_shell+0xa77adbd)
14:21:27.822 20384   #16 0x00000a77adbe (/b/s/w/ir/out/Release/content_shell+0xa77adbd)
14:21:27.823 20384   #17 0x00000a77848b (/b/s/w/ir/out/Release/content_shell+0xa77848a)
14:21:27.823 20384   #18 0x00000a777ba0 (/b/s/w/ir/out/Release/content_shell+0xa777b9f)
14:21:27.823 20384   #19 0x00000979f4b4 (/b/s/w/ir/out/Release/content_shell+0x979f4b3)
14:21:27.823 20384   #20 0x00000979b9fe (/b/s/w/ir/out/Release/content_shell+0x979b9fd)
14:21:27.823 20384   #21 0x00000a5ed4d8 (/b/s/w/ir/out/Release/content_shell+0xa5ed4d7)
14:21:27.823 20384   #22 0x00000e58de85 (/b/s/w/ir/out/Release/content_shell+0xe58de84)
14:21:27.823 20384   #23 0x00000bb8b2bc (/b/s/w/ir/out/Release/content_shell+0xbb8b2bb)
14:21:27.823 20384   #24 0x0000049e8878 (/b/s/w/ir/out/Release/content_shell+0x49e8877)
14:21:27.823 20384   #25 0x000008cd1323 (/b/s/w/ir/out/Release/content_shell+0x8cd1322)
14:21:27.823 20384   #26 0x000008ccb3f5 (/b/s/w/ir/out/Release/content_shell+0x8ccb3f4)
14:21:27.823 20384   #27 0x0000049e8878 (/b/s/w/ir/out/Release/content_shell+0x49e8877)
14:21:27.823 20384   #28 0x00000487f989 (/b/s/w/ir/out/Release/content_shell+0x487f988)
14:21:27.823 20384   #29 0x000004880bc1 (/b/s/w/ir/out/Release/content_shell+0x4880bc0)
14:21:27.823 20384   #30 0x00000488192e (/b/s/w/ir/out/Release/content_shell+0x488192d)
14:21:27.823 20384   #31 0x00000488812f (/b/s/w/ir/out/Release/content_shell+0x488812e)
14:21:27.823 20384   #32 0x0000048e3168 (/b/s/w/ir/out/Release/content_shell+0x48e3167)
14:21:27.823 20384   #33 0x00000b5c9425 (/b/s/w/ir/out/Release/content_shell+0xb5c9424)
14:21:27.823 20384   #34 0x000002fd7300 (/b/s/w/ir/out/Release/content_shell+0x2fd72ff)
14:21:27.823 20384   #35 0x000002fda1fe (/b/s/w/ir/out/Release/content_shell+0x2fda1fd)
14:21:27.823 20384   #36 0x000007ff9c39 (/b/s/w/ir/out/Release/content_shell+0x7ff9c38)
14:21:27.823 20384   #37 0x000001346147 (/b/s/w/ir/out/Release/content_shell+0x1346146)
14:21:27.823 20384   #38 0x000000502e9a (/b/s/w/ir/out/Release/content_shell+0x502e99)
14:21:27.823 20384   #39 0x7f6d3596ef45 (/lib/x86_64-linux-gnu/libc-2.19.so+0x21f44)
14:21:27.823 20384   #40 0x0000004364bc (/b/s/w/ir/out/Release/content_shell+0x4364bb)
14:21:27.823 20384     r8: 00007fff3073b8a0  r9: fffff011daedb304 r10: 00000fee25124c54 r11: 0000000000000004
14:21:27.823 20384    r12: 0000000000000000 r13: 000000000000000a r14: 000061400029ffa8 r15: 00007f6d28966200
14:21:27.823 20384     di: 000061400029ffa8  si: 000061d000083110  bp: 00007fff3073b8f0  bx: 00007fff3073b900
14:21:27.823 20384     dx: 000000000000000a  ax: 0000000000000003  cx: 00000fffe60e7710  sp: 00007fff3073b880
14:21:27.823 20384     ip: 0000000007058206 efl: 0000000000010297 cgf: 0000000000000033 erf: 0000000000000004
14:21:27.823 20384    trp: 000000000000000e msk: 0000000000000000 cr2: 00006140002a0000
14:21:27.823 20384   [end of stack trace]
14:21:27.823 20384   Calling _exit(1). Core file will not be generated.
14:21:27.829 5894 [1/2] imagecapture/MediaStreamTrack-applyConstraints.html failed unexpectedly (renderer crashed)


For imagecapture/MediaStreamTrack-getSettings.html:


13:07:03.024 20116 Retrying 1 unexpected failure, attempt 2 of 3...
13:07:03.024 20116 Sharding tests ...
13:07:03.024 20116 Starting 1 worker ...
13:07:03.024 20116 worker/0 starting
13:07:04.729 20116 renderer crash, pid = None, error_line = #CRASHED - renderer
13:07:04.730 20116 killed pid 1102
13:07:04.731 20116 worker/0 imagecapture/MediaStreamTrack-getSettings.html crashed, (stderr lines):
13:07:04.731 20116   [1102:1158:0720/130704.426863:10671176530:ERROR:devtools_http_handler.cc(786)] 
13:07:04.731 20116   DevTools listening on 127.0.0.1:50973
13:07:04.731 20116   
13:07:04.731 20116   Xlib:  extension "RANDR" missing on display ":100".
13:07:04.731 20116   Failed to tell parent about crash.
13:07:04.731 20116   Received signal 11 SEGV_ACCERR 6140002a0000
13:07:04.731 20116   #0 0x0000004816b1 (/b/s/w/ir/out/Release/content_shell+0x4816b0)
13:07:04.731 20116   #1 0x000004823dac (/b/s/w/ir/out/Release/content_shell+0x4823dab)
13:07:04.732 20116   #2 0x000004822d4d (/b/s/w/ir/out/Release/content_shell+0x4822d4c)
13:07:04.732 20116   #3 0x7f9520fe7cb0 (/lib/x86_64-linux-gnu/libc-2.19.so+0x36caf)
13:07:04.732 20116   #4 0x000007053dd6 (/b/s/w/ir/out/Release/content_shell+0x7053dd5)
13:07:04.732 20116   #5 0x000007024f95 (/b/s/w/ir/out/Release/content_shell+0x7024f94)
13:07:04.732 20116   #6 0x00000701a85b (/b/s/w/ir/out/Release/content_shell+0x701a85a)
13:07:04.732 20116   #7 0x00000b705d04 (/b/s/w/ir/out/Release/content_shell+0xb705d03)
13:07:04.732 20116   #8 0x0000098e4092 (/b/s/w/ir/out/Release/content_shell+0x98e4091)
13:07:04.732 20116   #9 0x0000098e51da (/b/s/w/ir/out/Release/content_shell+0x98e51d9)
13:07:04.732 20116   #10 0x00000a677c57 (/b/s/w/ir/out/Release/content_shell+0xa677c56)
13:07:04.732 20116   #11 0x00000a09b5f8 (/b/s/w/ir/out/Release/content_shell+0xa09b5f7)
13:07:04.732 20116   #12 0x00000a6d6cf0 (/b/s/w/ir/out/Release/content_shell+0xa6d6cef)
13:07:04.732 20116   #13 0x00000a775157 (/b/s/w/ir/out/Release/content_shell+0xa775156)
13:07:04.732 20116   #14 0x00000a7767ae (/b/s/w/ir/out/Release/content_shell+0xa7767ad)
13:07:04.732 20116   #15 0x00000a7767ae (/b/s/w/ir/out/Release/content_shell+0xa7767ad)
13:07:04.732 20116   #16 0x00000a7767ae (/b/s/w/ir/out/Release/content_shell+0xa7767ad)
13:07:04.732 20116   #17 0x00000a773e7b (/b/s/w/ir/out/Release/content_shell+0xa773e7a)
13:07:04.732 20116   #18 0x00000a773590 (/b/s/w/ir/out/Release/content_shell+0xa77358f)
13:07:04.732 20116   #19 0x00000979aea4 (/b/s/w/ir/out/Release/content_shell+0x979aea3)
13:07:04.733 20116   #20 0x0000097973ee (/b/s/w/ir/out/Release/content_shell+0x97973ed)
13:07:04.733 20116   #21 0x00000a5e8ec8 (/b/s/w/ir/out/Release/content_shell+0xa5e8ec7)
13:07:04.733 20116   #22 0x00000e5872f5 (/b/s/w/ir/out/Release/content_shell+0xe5872f4)
13:07:04.733 20116   #23 0x00000bb86c1c (/b/s/w/ir/out/Release/content_shell+0xbb86c1b)
13:07:04.733 20116   #24 0x0000049e4428 (/b/s/w/ir/out/Release/content_shell+0x49e4427)
13:07:04.733 20116   #25 0x000008cccd13 (/b/s/w/ir/out/Release/content_shell+0x8cccd12)
13:07:04.733 20116   #26 0x000008cc6de5 (/b/s/w/ir/out/Release/content_shell+0x8cc6de4)
13:07:04.733 20116   #27 0x0000049e4428 (/b/s/w/ir/out/Release/content_shell+0x49e4427)
13:07:04.733 20116   #28 0x00000487b539 (/b/s/w/ir/out/Release/content_shell+0x487b538)
13:07:04.733 20116   #29 0x00000487c771 (/b/s/w/ir/out/Release/content_shell+0x487c770)
13:07:04.733 20116   #30 0x00000487d4de (/b/s/w/ir/out/Release/content_shell+0x487d4dd)
13:07:04.733 20116   #31 0x000004883cdf (/b/s/w/ir/out/Release/content_shell+0x4883cde)
13:07:04.733 20116   #32 0x0000048ded18 (/b/s/w/ir/out/Release/content_shell+0x48ded17)
13:07:04.733 20116   #33 0x00000b5c4d85 (/b/s/w/ir/out/Release/content_shell+0xb5c4d84)
13:07:04.733 20116   #34 0x000002fd5ee0 (/b/s/w/ir/out/Release/content_shell+0x2fd5edf)
13:07:04.733 20116   #35 0x000002fd8dde (/b/s/w/ir/out/Release/content_shell+0x2fd8ddd)
13:07:04.733 20116   #36 0x000007ff5809 (/b/s/w/ir/out/Release/content_shell+0x7ff5808)
13:07:04.733 20116   #37 0x000001346147 (/b/s/w/ir/out/Release/content_shell+0x1346146)
13:07:04.733 20116   #38 0x000000502e9a (/b/s/w/ir/out/Release/content_shell+0x502e99)
13:07:04.734 20116   #39 0x7f9520fd2f45 (/lib/x86_64-linux-gnu/libc-2.19.so+0x21f44)
13:07:04.734 20116   #40 0x0000004364bc (/b/s/w/ir/out/Release/content_shell+0x4364bb)
13:07:04.734 20116     r8: 00007ffe714614a0  r9: fffff00cdd7f7904 r10: 00000ff322808714 r11: 0000000000000004
13:07:04.734 20116    r12: 0000000000000000 r13: 000000000000000a r14: 000061400029ffa8 r15: 00007f9514083800
13:07:04.734 20116     di: 000061400029ffa8  si: 000061d000083110  bp: 00007ffe714614f0  bx: 00007ffe71461500
13:07:04.734 20116     dx: 000000000000000a  ax: 0000000000000003  cx: 00000fffce28c290  sp: 00007ffe71461480
13:07:04.734 20116     ip: 0000000007053dd6 efl: 0000000000010297 cgf: 0000000000000033 erf: 0000000000000004
13:07:04.734 20116    trp: 000000000000000e msk: 0000000000000000 cr2: 00006140002a0000
13:07:04.734 20116   [end of stack trace]
13:07:04.734 20116   Calling _exit(1). Core file will not be generated.
13:07:04.735 20116 [1/1] imagecapture/MediaStreamTrack-getSettings.html failed unexpectedly (renderer crashed)

Assigning to mcasas for investigation/reassignment.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/56fdb075eb79bb939d3541bc70225fe8441f7a7a

commit 56fdb075eb79bb939d3541bc70225fe8441f7a7a
Author: Scott Little <sclittle@chromium.org>
Date: Fri Jul 21 00:52:14 2017

Mark two imagecapture layout tests as flaky.

TBR=mcasas@chromium.org

Bug:  747163 
Change-Id: I8a28b6ed839c65b75b5244058c3f8c8a6e82f8db
Reviewed-on: https://chromium-review.googlesource.com/580340
Commit-Queue: Scott Little <sclittle@chromium.org>
Reviewed-by: Scott Little <sclittle@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488520}
[modify] https://crrev.com/56fdb075eb79bb939d3541bc70225fe8441f7a7a/third_party/WebKit/LayoutTests/TestExpectations

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/be87f9d72a446ff1816cba3f7be16d771e68d5bc

commit be87f9d72a446ff1816cba3f7be16d771e68d5bc
Author: Quinten Yearsley <qyearsley@chromium.org>
Date: Wed Nov 01 15:25:46 2017

Clean up flaky expectations with update-flaky-expectations

Bug:  457273 , 605525 ,626703, 667560 ,708499, 731509 , 731535 , 732103 , 736548 , 746904 , 747163 , 752845 , 771729 
Change-Id: Ibf4be93e26a364e91d44375379aa8b5a7b59b94f
Reviewed-on: https://chromium-review.googlesource.com/736047
Reviewed-by: David Bokan <bokan@chromium.org>
Commit-Queue: Quinten Yearsley <qyearsley@chromium.org>
Cr-Commit-Position: refs/heads/master@{#513134}
[modify] https://crrev.com/be87f9d72a446ff1816cba3f7be16d771e68d5bc/third_party/WebKit/LayoutTests/TestExpectations

Obsolete, appears not to be flaky again.