CrWinClangGoma too.
https://build.chromium.org/p/chromium.fyi/builders/CrWinClangGoma/builds/14590
https://build.chromium.org/p/chromium.fyi/builders/CrWinClangGoma/builds/14590/steps/compile/logs/stdio

[21480/31131] LINK_EMBED gin_unittests.exe
FAILED: E:\b\depot_tools\python276_bin\python.exe gyp-win-tool action-wrapper environment.x86 net_unittests_run_target_isolate_ec04b5886c191953441d17d760e96c64.4443f7992807495cfdc0f1e89061f9ea.rsp ..\..\net
Failed to find an input file: Input file E:\b\build\slave\CrWinClangGoma\build\src\out\Release\api-ms-win-core-console-l1-1-0.dll doesn't exist

ninja: build stopped: subcommand failed.

Is it vs2015 packaging issue?
Or, do we need install VS2015 on this bot?

You shouldn't need VS 2015 installed, and the packaging includes those DLLs. The trick is that those DLLs are supposed to be copied to the Release directory by the gclient runhooks step (watch for output copying api-ms-win-*.dll and various other CRT DLLs). The DLLs are then needed by component builds.

I can see this output:
Copying E:\b\depot_tools\win_toolchain\vs_files\391bbf1220d3edcd3cc3fccdb56224181e3b13a7\sys32\api-ms-win-*.dll to E:\b\build\slave\CrWin7Goma_clbr_\build\src\out\Release...

in this step:

https://build.chromium.org/p/chromium.fyi/builders/CrWin7Goma%28clbr%29/builds/12137/steps/gclient%20runhooks/logs/stdio

Any idea why it wouldn't have worked? It's succeeding elsewhere.

clobber will remove files (except ninja or goma files) in out/Release before compiling?

need to fix scripts/slave/build_directory.py?
https://chromium.googlesource.com/chromium/tools/build/+/master/scripts/slave/build_directory.py#85

Ah, I see... I'll investigate and fix this.

A bit strange point is that it's working on Win (main waterfall).
https://build.chromium.org/p/chromium/waterfall?builder=Win

It is also clobber build.

Win doesn't run RULE net_unittests_run step?

CrWin7Goma (clbr) runs
[24307/31134] RULE net_unittests_run: isolate_ec04b5886c191953441d17d760e96c64 net_unittests.isolate

which cause the error
FAILED: E:\b\depot_tools\python276_bin\python.exe gyp-win-tool action-wrapper environment.x86 net_unittests_run_target_isolate_ec04b5886c191953441d17d760e96c64.4443f7992807495cfdc0f1e89061f9ea.rsp ..\..\net
Failed to find an input file: Input file E:\b\build\slave\CrWin7Goma_clbr_\build\src\out\Release\api-ms-win-core-console-l1-1-0.dll doesn't exist

https://build.chromium.org/p/chromium.fyi/builders/CrWin7Goma%28clbr%29/builds/12174/steps/compile/logs/stdio

On Win (main waterfall), 
I cannot find api-ms-win-*.dll in out/Release directory. I believe they were also removed by clobbering. However, C:\Windows\SysWOW64 contains api-ms-win-core-console-l1-1-0.dll. So, it's working?

Ah, sorry. it is not related.

(and CrWin7Goma(clbr) has api-ms-win-core-console-l1-1-0.dll in C:\Windows\SysWOW64, too)

Anyway, we need to update build_directory.py as ukai said in #5.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/tools/build.git/+/8338562d52525bacb2b74ecd8cc196d00e4283ca

commit 8338562d52525bacb2b74ecd8cc196d00e4283ca
Author: shinyak@google.com <shinyak@google.com>
Date: Thu Mar 17 04:09:59 2016

Fix CrWin7Goma(clbr) build.

Now VS2015 is the default compiler for Win. It requires several more
DLLs, and they're copied to out/{Debug,Release} directory in
'gclient runhooks' step.

These are the copied DLLs.
- msvcp140{,d}.dll
- vcruntime140{,d}.dll
- api-ms-win-*.dll
- ucrtbase{,d}.dll

However, compile.py removes them if --clobber is specified.

Win builder on main waterfall should have the same potential problem,
however, it is not affected because it's not building net_unittests.
CrWin7Goma(clbr) is affected because it builds all.

BUG= 594882 

Review URL: https://codereview.chromium.org/1805833002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/build@299338 0039d316-1c4b-4281-b951-d872f2087c98

[modify] https://crrev.com/8338562d52525bacb2b74ecd8cc196d00e4283ca/scripts/slave/build_directory.py