Work on Windows GN component build.

Work on Windows GN component build.

This makes ppapi_shared link. This required many changes to gpu to match the structure of GYP in both component and non-component modes.

BUG=470212
CQ_EXTRA_TRYBOTS=tryserver.chromium.linux:android_chromium_gn_compile_dbg,android_chromium_gn_compile_rel;tryserver.chromium.win:win8_chromium_gn_rel,win8_chromium_gn_dbg;tryserver.chromium.mac:mac_chromium_gn_rel,mac_chromium_gn_dbg

Reland of https://codereview.chromium.org/1053203003/

Committed: https://crrev.com/542f7537cf6f2d0a01be2893a859aaf629527fdd
Cr-Commit-Position: refs/heads/master@{#323966}

[brettw, 2015-04-06 20:53:27]

brettw@chromium.org changed reviewers:
+ dpranke@chromium.org

[brettw, 2015-04-06 20:53:28]

Hi Dirk,

Not sure why the trybots didn't catch this problem:
http://build.chromium.org/p/chromium.linux/builders/Linux%20GN/builds/26255/s...

Patch 1 is original, patch 2 is my proposed fix (not sure since I can't repro
locally and trybots don't repro either).

[brettw, 2015-04-06 20:53:34]

The CQ bit was checked by brettw@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-04-06 20:53:53]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1061953002/20001

[commit-bot: I haz the power, 2015-04-06 21:01:18]

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

[commit-bot: I haz the power, 2015-04-06 21:01:19]

Try jobs failed on following builders:
  mac_chromium_gn_dbg on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_gn_d...)
  mac_chromium_gn_rel on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_gn_r...)

[Dirk Pranke, 2015-04-06 21:07:35]

https://codereview.chromium.org/1061953002/diff/20001/ui/gl/BUILD.gn
File ui/gl/BUILD.gn (right):

https://codereview.chromium.org/1061953002/diff/20001/ui/gl/BUILD.gn#newcode114
ui/gl/BUILD.gn:114: public_configs += [ "//third_party/khronos:khronos_headers"
]
lgtm assuming you change this to 'public_configs ='

[brettw, 2015-04-06 21:09:26]

The CQ bit was checked by brettw@chromium.org

[brettw, 2015-04-06 21:09:26]

The patchset sent to the CQ was uploaded after l-g-t-m from dpranke@chromium.org
Link to the patchset: https://codereview.chromium.org/1061953002/#ps40001
(title: " ")

[commit-bot: I haz the power, 2015-04-06 21:10:00]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1061953002/40001

[commit-bot: I haz the power, 2015-04-06 22:36:10]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-04-06 22:36:58]

Patchset 3 (id:??) landed as
https://crrev.com/542f7537cf6f2d0a01be2893a859aaf629527fdd
Cr-Commit-Position: refs/heads/master@{#323966}