Use shared container to manage imports/exports.

Use shared container to manage imports/exports.

Also changed string.js and math.js to adapt this change.

R=jkummerow@chromium.org

Committed: https://crrev.com/e25058b0b7b9831162579564fc8935d568c1ecdd
Cr-Commit-Position: refs/heads/master@{#28521}

Committed: https://crrev.com/e56585077bdc3f6ce9990c86c00858c62eae790d
Cr-Commit-Position: refs/heads/master@{#28533}

[Jakob Kummerow, 2015-05-20 13:23:27]

LGTM with a comment.

https://codereview.chromium.org/1143993003/diff/1/src/bootstrapper.cc
File src/bootstrapper.cc (right):

https://codereview.chromium.org/1143993003/diff/1/src/bootstrapper.cc#newcode...
src/bootstrapper.cc:1524:
isolate->factory()->NewStringFromAsciiChecked("PostNatives");
Did you mean s/"PostNatives"/name/ here?

[Yang, 2015-05-20 14:33:11]

The CQ bit was checked by yangguo@chromium.org

[Yang, 2015-05-20 14:33:12]

The patchset sent to the CQ was uploaded after l-g-t-m from
jkummerow@chromium.org
Link to the patchset: https://codereview.chromium.org/1143993003/#ps20001
(title: "address comments")

[commit-bot: I haz the power, 2015-05-20 14:33:27]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1143993003/20001

[commit-bot: I haz the power, 2015-05-20 14:59:08]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-05-20 14:59:22]

Patchset 2 (id:??) landed as
https://crrev.com/e25058b0b7b9831162579564fc8935d568c1ecdd
Cr-Commit-Position: refs/heads/master@{#28521}

[Jakob Kummerow, 2015-05-20 15:59:17]

A revert of this CL (patchset #2 id:20001) has been created in
https://codereview.chromium.org/1144163002/ by jkummerow@chromium.org.

The reason for reverting is: Breaks nosnap bots.

[Yang, 2015-05-21 05:40:40]

The CQ bit was checked by yangguo@chromium.org

[Yang, 2015-05-21 05:40:40]

The patchset sent to the CQ was uploaded after l-g-t-m from
jkummerow@chromium.org
Link to the patchset: https://codereview.chromium.org/1143993003/#ps40001
(title: "fixed test for no-snap")

[commit-bot: I haz the power, 2015-05-21 05:40:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1143993003/40001

[commit-bot: I haz the power, 2015-05-21 06:15:42]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-05-21 06:16:00]

Patchset 3 (id:??) landed as
https://crrev.com/e56585077bdc3f6ce9990c86c00858c62eae790d
Cr-Commit-Position: refs/heads/master@{#28533}