Reland of move enable_vulkan from build/config, and move it to the buildflag_header system.

Reland of move enable_vulkan from build/config, and move it to the buildflag_header system. (patchset #1 id:1 of https://codereview.chromium.org/2742263004/ )

Reason for revert:
Relanding since this revert doesn't appear to have helped:
https://build.chromium.org/p/chromium.linux/builders/Linux%20Tests

Original issue's description:
> Revert of Remove enable_vulkan from build/config, and move it to the buildflag_header system. (patchset #8 id:140001 of https://codereview.chromium.org/2744973002/ )
> 
> Reason for revert:
> Speculative revert for linux tests failure:
> https://build.chromium.org/p/chromium.linux/builders/Linux%20Tests
> 
> Original issue's description:
> > Remove enable_vulkan from build/config, and move it to the buildflag_header system.
> > 
> > No intended behavior change.
> > 
> > TBR=avi
> > BUG=none
> > CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
> > 
> > Review-Url: https://codereview.chromium.org/2744973002
> > Cr-Commit-Position: refs/heads/master@{#456525}
> > Committed: https://chromium.googlesource.com/chromium/src/+/7f118188c140989c8a633c60d531b4c08eef8564
> 
> TBR=dyen@chromium.org,danakj@chromium.org,jbauman@chromium.org,avi@chromium.org,piman@chromium.org,thakis@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=none
> 
> Review-Url: https://codereview.chromium.org/2742263004
> Cr-Commit-Position: refs/heads/master@{#456562}
> Committed: https://chromium.googlesource.com/chromium/src/+/0192171168e7afc337edc13c150eca4152185cd5

TBR=dyen@chromium.org,danakj@chromium.org,jbauman@chromium.org,avi@chromium.org,piman@chromium.org,thakis@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=none

Review-Url: https://codereview.chromium.org/2746363002
Cr-Commit-Position: refs/heads/master@{#456613}
Committed: https://chromium.googlesource.com/chromium/src/+/db0a348759ea9c97783c516344a1d96880ceb359

[qyearsley, 2017-03-14 03:18:07]

The CQ bit was checked by qyearsley@chromium.org

[qyearsley, 2017-03-14 03:18:08]

Created Reland of move enable_vulkan from build/config, and move it to the
buildflag_header system.

[commit-bot: I haz the power, 2017-03-14 03:18:38]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-03-14 03:24:35]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1489461487612390, "parent_rev":
"83fe4349b1c39dbfb74619f20852c8dc99b6a7c1", "commit_rev":
"db0a348759ea9c97783c516344a1d96880ceb359"}

[commit-bot: I haz the power, 2017-03-14 03:25:15]

Description was changed from

==========
Reland of move enable_vulkan from build/config, and move it to the
buildflag_header system. (patchset #1 id:1 of
https://codereview.chromium.org/2742263004/ )

Reason for revert:
Relanding since this revert doesn't appear to have helped:
https://build.chromium.org/p/chromium.linux/builders/Linux%20Tests

Original issue's description:
> Revert of Remove enable_vulkan from build/config, and move it to the
buildflag_header system. (patchset #8 id:140001 of
https://codereview.chromium.org/2744973002/ )
> 
> Reason for revert:
> Speculative revert for linux tests failure:
> https://build.chromium.org/p/chromium.linux/builders/Linux%20Tests
> 
> Original issue's description:
> > Remove enable_vulkan from build/config, and move it to the buildflag_header
system.
> > 
> > No intended behavior change.
> > 
> > TBR=avi
> > BUG=none
> >
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
> > 
> > Review-Url: https://codereview.chromium.org/2744973002
> > Cr-Commit-Position: refs/heads/master@{#456525}
> > Committed:
https://chromium.googlesource.com/chromium/src/+/7f118188c140989c8a633c60d531...
> 
>
TBR=dyen@chromium.org,danakj@chromium.org,jbauman@chromium.org,avi@chromium.o...
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=none
> 
> Review-Url: https://codereview.chromium.org/2742263004
> Cr-Commit-Position: refs/heads/master@{#456562}
> Committed:
https://chromium.googlesource.com/chromium/src/+/0192171168e7afc337edc13c150e...

TBR=dyen@chromium.org,danakj@chromium.org,jbauman@chromium.org,avi@chromium.o...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=none
==========

to

==========
Reland of move enable_vulkan from build/config, and move it to the
buildflag_header system. (patchset #1 id:1 of
https://codereview.chromium.org/2742263004/ )

Reason for revert:
Relanding since this revert doesn't appear to have helped:
https://build.chromium.org/p/chromium.linux/builders/Linux%20Tests

Original issue's description:
> Revert of Remove enable_vulkan from build/config, and move it to the
buildflag_header system. (patchset #8 id:140001 of
https://codereview.chromium.org/2744973002/ )
> 
> Reason for revert:
> Speculative revert for linux tests failure:
> https://build.chromium.org/p/chromium.linux/builders/Linux%20Tests
> 
> Original issue's description:
> > Remove enable_vulkan from build/config, and move it to the buildflag_header
system.
> > 
> > No intended behavior change.
> > 
> > TBR=avi
> > BUG=none
> >
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
> > 
> > Review-Url: https://codereview.chromium.org/2744973002
> > Cr-Commit-Position: refs/heads/master@{#456525}
> > Committed:
https://chromium.googlesource.com/chromium/src/+/7f118188c140989c8a633c60d531...
> 
>
TBR=dyen@chromium.org,danakj@chromium.org,jbauman@chromium.org,avi@chromium.o...
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=none
> 
> Review-Url: https://codereview.chromium.org/2742263004
> Cr-Commit-Position: refs/heads/master@{#456562}
> Committed:
https://chromium.googlesource.com/chromium/src/+/0192171168e7afc337edc13c150e...

TBR=dyen@chromium.org,danakj@chromium.org,jbauman@chromium.org,avi@chromium.o...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=none

Review-Url: https://codereview.chromium.org/2746363002
Cr-Commit-Position: refs/heads/master@{#456613}
Committed:
https://chromium.googlesource.com/chromium/src/+/db0a348759ea9c97783c516344a1...
==========

[commit-bot: I haz the power, 2017-03-14 03:25:16]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/db0a348759ea9c97783c516344a1...