Add SkBarriers_tsan.h.

Add SkBarriers_tsan.h.

Slight counterproposal to crrev.com/310663002.

BUG=skia:

No API changes.
TBR=

Committed: https://skia.googlesource.com/skia/+/a8928b745a7158a432033a28c49fb0f0450ccf6e

[bungeman-skia, 2014-06-03 15:23:54]

lgtm

https://codereview.chromium.org/306373002/diff/100001/src/ports/SkBarriers_ts...
File src/ports/SkBarriers_tsan.h (right):

https://codereview.chromium.org/306373002/diff/100001/src/ports/SkBarriers_ts...
src/ports/SkBarriers_tsan.h:42: T sk_acquire_load(T* ptr) { return SkBarriers<T,
8*sizeof(T)>::AcquireLoad(ptr); }
CHAR_BIT forever!!!!

[mtklein, 2014-06-03 15:28:52]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2014-06-03 15:29:08]

CQ is trying da patch. Follow status at
 https://skia-tree-status.appspot.com/cq/mtklein@chromium.org/306373002/120001

[commit-bot: I haz the power, 2014-06-03 15:29:11]

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

[commit-bot: I haz the power, 2014-06-03 15:29:11]

Presubmit check for 306373002-120001 failed and returned exit status 1.

Running presubmit commit checks ...

** Presubmit ERRORS **
Since the CL is editing public API, you must have an LGTM from one of:
('reed@chromium.org', 'reed@google.com', 'bsalomon@chromium.org',
'bsalomon@google.com')

Was the presubmit check useful? If not, run "git cl presubmit -v"
to figure out which PRESUBMIT.py was run, then run git blame
on the file to figure out who to ask for help.

[mtklein, 2014-06-03 15:29:45]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2014-06-03 15:30:01]

CQ is trying da patch. Follow status at
 https://skia-tree-status.appspot.com/cq/mtklein@chromium.org/306373002/120001

[commit-bot: I haz the power, 2014-06-03 15:30:04]

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

[commit-bot: I haz the power, 2014-06-03 15:30:04]

Presubmit check for 306373002-120001 failed and returned exit status 1.

Running presubmit commit checks ...

** Presubmit ERRORS **
Since the CL is editing public API, you must have an LGTM from one of:
('reed@chromium.org', 'reed@google.com', 'bsalomon@chromium.org',
'bsalomon@google.com')

[mtklein, 2014-06-03 15:31:24]

+reed for include/.  No API changes.

I thought TBR=reed@google.com or TBR= would bypass the check?  Neither did.

[mtklein, 2014-06-03 22:29:17]

On 2014/06/03 15:31:24, mtklein wrote:
> +reed for include/.  No API changes.
> 
> I thought mailto:TBR=reed@google.com or TBR= would bypass the check?  Neither
did.

Ping Mike?  No API changes, doesn't affect release code, or really anything but
the TSAN bot.

[reed1, 2014-06-05 21:38:07]

lgtm

[mtklein, 2014-06-05 22:03:16]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2014-06-05 22:04:08]

CQ is trying da patch. Follow status at
 https://skia-tree-status.appspot.com/cq/mtklein@chromium.org/306373002/140001

[commit-bot: I haz the power, 2014-06-05 22:04:11]

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

[commit-bot: I haz the power, 2014-06-05 22:04:12]

Failed to apply patch for include/core/SkPostConfig.h:
While running git apply --index -p1;
  error: patch failed: include/core/SkPostConfig.h:400
  error: include/core/SkPostConfig.h: patch does not apply

Patch:       include/core/SkPostConfig.h
Index: include/core/SkPostConfig.h
diff --git a/include/core/SkPostConfig.h b/include/core/SkPostConfig.h
index
d4d9857d87726e7f4e711f65845e24e4c6d11b0a..dfb1d42ca507de4e392939f0bb8206fc596bdb01
100644
--- a/include/core/SkPostConfig.h
+++ b/include/core/SkPostConfig.h
@@ -400,7 +400,9 @@
 #endif
 
 #ifndef SK_BARRIERS_PLATFORM_H
-#  if defined(SK_CPU_ARM) || defined(SK_CPU_ARM64)
+#  if SK_HAS_COMPILER_FEATURE(thread_sanitizer)
+#    define SK_BARRIERS_PLATFORM_H "../../src/ports/SkBarriers_tsan.h"
+#  elif defined(SK_CPU_ARM) || defined(SK_CPU_ARM64)
 #    define SK_BARRIERS_PLATFORM_H "../../src/ports/SkBarriers_arm.h"
 #  else
 #    define SK_BARRIERS_PLATFORM_H "../../src/ports/SkBarriers_x86.h"

[mtklein, 2014-06-05 22:07:58]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2014-06-05 22:09:08]

CQ is trying da patch. Follow status at
 https://skia-tree-status.appspot.com/cq/mtklein@chromium.org/306373002/160001

[mtklein, 2014-06-05 22:17:25]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2014-06-05 22:17:28]

CQ is trying da patch. Follow status at
 https://skia-tree-status.appspot.com/cq/mtklein@chromium.org/306373002/180001

[commit-bot: I haz the power, 2014-06-06 13:21:59]

Change committed as a8928b745a7158a432033a28c49fb0f0450ccf6e