serial: Fix getSignals() error handling #26824
Merged
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This change fixes error handling for the getSignals() method. It was
assumed that the Mojo reply value could be null on error but this was
not allowed by serial.mojom. This meant that if a call to
GetControlSignals() failed it would trigger a Mojo connection failure
rather than only reporting the (potentially recoverable) error.
Tests exercising this case on both the renderer and browser process
sides have been added.
Bug: 1156864
Change-Id: Ife5c953d5f6748c0290fae2f2d53c5415c1faba6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2580747
Commit-Queue: Reilly Grant <[email protected]>
Reviewed-by: Dominick Ng <[email protected]>
Cr-Commit-Position: refs/heads/master@{#835293}