fd25f80a1 make it possible to disable debug symbols stripping (flutter/engine#11265) (#39291)

git@github.com:flutter/engine.git/compare/59e14bc5f69e...fd25f80a1d3c

git log 59e14bc5f69e..fd25f80a1d3c --no-merges --oneline
2019-08-26 xster@google.com make it possible to disable debug symbols stripping (flutter/engine#11265)


If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC liyuqian@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

bin/internal/engine.version

-59e14bc5f69e185e42fb05b70ce923b11876eaca
+fd25f80a1d3c96fd0c8d72d970bf9a73317e71d3