Add debug symbols to all generated .isolate (bis).

Add debug symbols to all generated .isolate (bis).

This will increase the amount of data being uploaded by a ~2x factor or so.
Debug symbols are usually larger than the executable itself on pretty much all
toolsets but generally have the advantage of being highly compressible. The
increase of data not a problem anymore with isolate-go. There will be a small
increase of latency but it should be bearable, especially by the gain of
enabling stack traces to work for isolated tests on Swarming.

R=jam@chromium.org
BUG=98637
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Committed: https://crrev.com/aad3ded46d115f94f1c501c5b21fa1ef73ef771b
Cr-Commit-Position: refs/heads/master@{#349953}

[M-A Ruel, 2015-09-18 17:51:53]

If you compare:
succeeding:
https://isolateserver.appspot.com/browse?namespace=default-gzip&hash=3124367d...
failing:
https://isolateserver.appspot.com/browse?namespace=default-gzip&hash=f9d8e3cb...

The main difference is that the one that fails doesn't have
libchrome_main_dll.dylib. So I added an explicitly condition for .dylib and not
just .dylib.TOC.

[jam, 2015-09-21 16:51:29]

lgtm

[M-A Ruel, 2015-09-21 16:54:12]

The CQ bit was checked by maruel@chromium.org

[commit-bot: I haz the power, 2015-09-21 16:54:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1350413002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1350413002/20001

[commit-bot: I haz the power, 2015-09-21 17:36:12]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-09-21 17:37:20]

Patchset 2 (id:??) landed as
https://crrev.com/aad3ded46d115f94f1c501c5b21fa1ef73ef771b
Cr-Commit-Position: refs/heads/master@{#349953}

[paulmeyer, 2015-09-21 18:56:39]

A revert of this CL (patchset #2 id:20001) has been created in
https://codereview.chromium.org/1359703002/ by paulmeyer@chromium.org.

The reason for reverting is: Broke many Mac tests, such as:
https://build.chromium.org/p/chromium.mac/builders/Mac10.9%20Tests%20%28dbg%2....