Reland Switch Chrome Android using v8 arch specific external data name

Orignal patch
https://codereview.chromium.org/1400953002/

Switch Chrome Android using v8 arch specific external data name

For 32-bit, natives_blob_32.bin and snapshot_blob_32.bin are used.
For 64-bit, natives_blob_64.bin and natives_blob_64.bin are used.

This patch also removed the existing v8 startup data in
destination directory by using copy_ex to remove directory
first.

BUG=540788
TBR=jochen@chromium.org,dpranke@chromium.org,halliwell@chromium.org,jbudorick@chromium.org,mef@chromium.org,rmcilroy@chromium.org,dtrainor@chromium.org,cpu@chromium.org

Committed: https://crrev.com/ed31140dee44c06e6398e92e1afb9c047c9137e6
Cr-Commit-Position: refs/heads/master@{#355843}

[michaelbai, 2015-10-23 04:38:30]

Description was changed from

==========
Revert "Revert of Switch Chrome Android using v8 arch specific external data
name (patchset #5 id:80001 of https://codereview.chromium.org/1400953002/ )"

This reverts commit c2574ed2dede52cbf0353a3aca99d96cf0794571.

BUG=
==========

to

==========
Orignal patch 
https://codereview.chromium.org/1400953002/

Switch Chrome Android using v8 arch specific external data name

For 32-bit, natives_blob_32.bin and snapshot_blob_32.bin are used.
For 64-bit, natives_blob_64.bin and natives_blob_64.bin are used.

This patch also removed the existing v8 startup data in
destination directory by using copy_ex to remove directory
first.

BUG=540788
TBR=jochen@chromium.org,dpranke@chromium.org,halliwell@chromium.org,jbudorick...
==========

[michaelbai, 2015-10-23 04:39:26]

The CQ bit was checked by michaelbai@chromium.org

[commit-bot: I haz the power, 2015-10-23 04:39:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1417753004/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1417753004/20001

[commit-bot: I haz the power, 2015-10-23 04:40:56]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-10-23 04:40:57]

Try jobs failed on following builders:
  ios_dbg_simulator_ninja on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_dbg_simulator...)
  ios_rel_device_ninja on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_rel_device_ni...)
  mac_chromium_rel_ng on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_...)

[michaelbai, 2015-10-23 16:36:56]

The CQ bit was checked by michaelbai@chromium.org

[commit-bot: I haz the power, 2015-10-23 16:37:41]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1417753004/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1417753004/40001

[commit-bot: I haz the power, 2015-10-23 18:46:18]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-10-23 18:49:19]

Patchset 3 (id:??) landed as
https://crrev.com/ed31140dee44c06e6398e92e1afb9c047c9137e6
Cr-Commit-Position: refs/heads/master@{#355843}

[jbudorick, 2015-10-23 20:51:31]

A revert of this CL (patchset #3 id:40001) has been created in
https://codereview.chromium.org/1421893002/ by jbudorick@chromium.org.

The reason for reverting is: broke gpu bots:
https://build.chromium.org/p/chromium.gpu/builders/Android%20Debug%20%28Nexus....