[telemetry] Print stack trace/stdout when browser fails to launch.
[telemetry] Print stack trace/stdout when browser fails to launch.

GetStackTrace() should be defined on all platforms already. Right now on desktop it just calls GetStandardOutput().

BUG=261684
TEST=None.
R=tonyg@chromium.org

Review URL: https://codereview.chromium.org/19462010

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@212435 0039d316-1c4b-4281-b951-d872f2087c98

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