Use Google Feedback CrashBuilder API to make reports easier to consume.

Use Google Feedback CrashBuilder API to make reports easier to consume.

Manual Cherry-Pick Part 1 of http://ag/699672

Currently, Feedback reports don't include a stacktrace. You have to
download
a system log file to find it. This tweak allows us to see the stacktrace
on the Report page itself.

Example old report:
https://feedback.corp.google.com/product/102042/crash?lView=rd&lCategory=8590053278&lRSort=1&lROrder=2&lRFilter=1&lReport=5517267704
Example new report:
https://feedback.corp.google.com/product/102042/crash?lView=rd&lCategory=8590053278&lRSort=1&lROrder=2&lRFilter=1&lReport=5517601160

Change-Id: If5f0ed6c69e96fe5f3661af913ae1525f8594b75