Make isolate_driver.py only add .dll/.so/.dylib for component builds' generated files.

Make isolate_driver.py only add .dll/.so/.dylib for component builds' generated files.

Right now it's adding a lot of other files that aren't needed to run the tests, which slows down the uploading and downloading steps when using component builds. Since this preprocessing step is only meant to add extra binaries that are the result of the component build, just whitelist .dll/.so/.dylib.

BUG=414808
Committed: https://crrev.com/3e06ba0e663c5a1cc7e87f4b814ecd8d3f00c179
Cr-Commit-Position: refs/heads/master@{#296037}

[jam, 2014-09-22 17:45:34]

jam@chromium.org changed reviewers:
+ maruel@chromium.org

[jam, 2014-09-22 17:53:23]

as one datapoint, this drops the generated content_unittests.isolate file from >
2K lines to under 100.

[M-A Ruel, 2014-09-22 18:15:17]

Ugh, no idea why I hadn't done this in the first place.

lgtm

[jam, 2014-09-22 19:11:36]

The CQ bit was checked by jam@chromium.org

[commit-bot: I haz the power, 2014-09-22 19:12:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/592143002/1

[commit-bot: I haz the power, 2014-09-22 20:26:30]

Committed patchset #1 (id:1) as 65038978f1ef837b23e658c29264fea8c558ae4a

[commit-bot: I haz the power, 2014-09-22 20:27:33]

Patchset 1 (id:??) landed as
https://crrev.com/3e06ba0e663c5a1cc7e87f4b814ecd8d3f00c179
Cr-Commit-Position: refs/heads/master@{#296037}