The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/0c92c8615de02790112e074dc60846d569410ca0

commit 0c92c8615de02790112e074dc60846d569410ca0
Author: Tim Volodine <timvolodine@chromium.org>
Date: Wed Mar 28 19:26:16 2018

[Android WebView] Tracing API: replace exceptions with errors on start.

Update api to return errors on start so that they can be processed
in the caller (glue layer) and appropriate exceptions can be thrown.
This is needed to make sure the exceptions are thrown on the
original calling thread (without resorting to other multithreaded
techinques such as locking)

BUG=781249, 826816 

Change-Id: I93611e046180b964d1abb6b71eeb2811885c3a1e
Reviewed-on: https://chromium-review.googlesource.com/981133
Commit-Queue: Tim Volodine <timvolodine@chromium.org>
Reviewed-by: Richard Coles <torne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#546562}
[modify] https://crrev.com/0c92c8615de02790112e074dc60846d569410ca0/android_webview/java/src/org/chromium/android_webview/AwTracingController.java

requesting merge to M66 (needed for proper exception handling & to pass CTS)

This bug requires manual review: M66 has already been promoted to the beta branch, so this requires manual review
Please contact the milestone owner if you have questions.
Owners: cmasso@(Android), cmasso@(iOS), josafat@(ChromeOS), abdulsyed@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/e066ec3a0c04560ca675d3e4d40b875455fc130a

commit e066ec3a0c04560ca675d3e4d40b875455fc130a
Author: Tim Volodine <timvolodine@chromium.org>
Date: Thu Mar 29 15:54:46 2018

[Android WebView] Tracing API: replace exceptions with errors on start.

MERGE to M66.

Update api to return errors on start so that they can be processed
in the caller (glue layer) and appropriate exceptions can be thrown.
This is needed to make sure the exceptions are thrown on the
original calling thread (without resorting to other multithreaded
techinques such as locking)

BUG=781249, 826816 

Change-Id: I93611e046180b964d1abb6b71eeb2811885c3a1e
Reviewed-on: https://chromium-review.googlesource.com/981133
Commit-Queue: Tim Volodine <timvolodine@chromium.org>
Reviewed-by: Richard Coles <torne@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#546562}(cherry picked from commit 0c92c8615de02790112e074dc60846d569410ca0)
Reviewed-on: https://chromium-review.googlesource.com/986235
Reviewed-by: Tim Volodine <timvolodine@chromium.org>
Cr-Commit-Position: refs/branch-heads/3359@{#495}
Cr-Branched-From: 66afc5e5d10127546cc4b98b9117aff588b5e66b-refs/heads/master@{#540276}
[modify] https://crrev.com/e066ec3a0c04560ca675d3e4d40b875455fc130a/android_webview/java/src/org/chromium/android_webview/AwTracingController.java