In Python 3 dict.values() is not a sortable type so it must be converted
to a list prior to returning targets data from the ReadTargets function.

In Python 3 you cannot compare arbitrary objects. This could happen when
sorting task_start_stop_times if the time and types were identical. This
is fixed by using the first two entries in the tuple as the sorting key.

When a .ninja_log file is corrupt it triggers a diagnostic message which
has only caused confusion. This changes that message to suggest the most
likely root cause (corruption) since that is the only cause I have seen.

If a build step generates multiple targets with long names then wrapping
of lines may occur. To avoid that the target description size is capped.

Bug: 941669
Change-Id: I2a808d2629a639e231ce2dbf2dab41251110b156
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2432409
Auto-Submit: Bruce Dawson <brucedawson@chromium.org>
Commit-Queue: Dirk Pranke <dpranke@google.com>
Reviewed-by: Dirk Pranke <dpranke@google.com>