I had to run "git cl upload" three times to upload a update to a patch. 

CR Link: https://chromium-review.googlesource.com/c/537334/
Branch Config:
[branch "fixgpumain"]
        remote = .
        merge = refs/heads/master
        base = 7a18f1f40bb62682b6e41e4b43f5ddc1e04033dd
        base-upstream = refs/heads/master
        gerritissue = 537334
        gerritserver = https://chromium-review.googlesource.com
        gerritsquashhash = db7a00ea2c4473b7feccad0e39ccbae60b6a2c51
        last-upload-hash = 7ac157122ff20a534a22b431a7cbababb517c9c5

Errors:
F:\src>git cl upload
Running presubmit upload checks ...
  checking owners took a long time: 2914ms

Presubmit checks took 6.3s to calculate.

Presubmit checks passed.
 content/gpu/gpu_main.cc | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)
Title for patchset [Reintroduce COM STA Initialization on the GpuMain Thread]: Switch to MTA
remote: Processing changes: updated: 1 (\)
To https://chromium.googlesource.com/chromium/src.git
 ! [remote rejected] 8f5c6f30e22b2fd6669fad3e9d078269cbde1cf5 -> refs/for/refs/heads/master%m=Switch_to_MTA,notify=NONE (error in Gerrit backend)
error: failed to push some refs to 'https://chromium.googlesource.com/chromium/src.git'

Error after CL description prompt -- saving description to C:\Users\robliao/.git_cl_description_backup

Failed to create a change. Please examine output above for the reason of the failure.
Hint: run command below to diagnose common Git/Gerrit credential problems:
  git cl creds-check


F:\src>git cl upload
Running presubmit upload checks ...
  checking owners took a long time: 4398ms

Presubmit checks took 8.0s to calculate.

Presubmit checks passed.
 content/gpu/gpu_main.cc | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)
Title for patchset [Reintroduce COM STA Initialization on the GpuMain Thread]: Switch to MTA
remote: Processing changes: (|)
To https://chromium.googlesource.com/chromium/src.git
 ! [remote rejected] 4009ef40c23a7b9c5165b951100e489af676a520 -> refs/for/refs/heads/master%m=Switch_to_MTA,notify=NONE (error in Gerrit backend)
error: failed to push some refs to 'https://chromium.googlesource.com/chromium/src.git'

Error after CL description prompt -- saving description to C:\Users\robliao/.git_cl_description_backup

Failed to create a change. Please examine output above for the reason of the failure.
Hint: run command below to diagnose common Git/Gerrit credential problems:
  git cl creds-check