I started out with the following single-line Java code:
        ThreadUtils.runOnUiThreadBlocking(() -> { urlBar.getInputConnection().commitText("a", 1); });

When trying to upload the patch, I get presubmit errors:
** Presubmit ERRORS **
chrome/android/javatests/src/org/chromium/chrome/browser/omnibox/UrlBarTest.java:434: Line is longer than 100 characters (found 101).

This makes sense.  Let me format it.

git cl format gives me
        ThreadUtils.runOnUiThreadBlocking(
+               () -> { urlBar.getInputConnection().commitText("a", 1); });

Okay, looks reasonable.  Committed to my local repository.

Now try to upload.

Nope, now different errors:
** Presubmit ERRORS **
  chrome/android/javatests/src/org/chromium/chrome/browser/omnibox/UrlBarTest.java:435:23: '{' at column 23 should have line break after.

Uh, hmmm.

Okay, let's try that manually, adding a line break.
        ThreadUtils.runOnUiThreadBlocking(
                () -> {
                    urlBar.getInputConnection().commitText("a", 1);
                });

It turns out I can upload this patch.  I get a mere presubmit warning.
** Presubmit Warnings **
The src directory requires source formatting. Please run git cl format .

Okay, I'll upload anyway and submit that way.

But what happens if I run "git cl format"?

It reverts the code formatting back to two-line definition above that generate a presubmit error.