Fix GN toolchains to use proper out dir.

build/toolchain/win/BUILD.gn

 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/win/visual_studio_version.gni")
 import("//build/toolchain/goma.gni")
 
 # Should only be running on Windows.
 assert(is_win)
 
@@ skipping 69 matching lines @@
         # allow targets to override this extension on Windows.
         "{{target_out_dir}}/{{target_output_name}}.lib",
       ]
       default_output_extension = ".lib"
       # The use of inputs_newline is to work around a fixed per-line buffer
       # size in the linker.
       rspfile_content = "{{inputs_newline}}"
     }
 
     tool("solink") {
-      dllname = "{{target_output_name}}{{output_extension}}"  # e.g. foo.dll
-      libname = "{{target_output_name}}{{output_extension}}.lib"  # e.g. foo.dll.lib
+      dllname = "{{root_out_dir}}/{{target_output_name}}{{output_extension}}"  # e.g. foo.dll
+      libname = "{{root_out_dir}}/{{target_output_name}}{{output_extension}}.lib"  # e.g. foo.dll.lib
       rspfile = "${dllname}.rsp"
 
       link_command = "$python_path gyp-win-tool link-wrapper $env False link.exe /nologo /IMPLIB:$libname /DLL /OUT:$dllname /PDB:${dllname}.pdb @$rspfile"
 
       # TODO(brettw) support manifests
       #manifest_command = "$python_path gyp-win-tool manifest-wrapper $env mt.exe -nologo -manifest $manifests -out:${dllname}.manifest"
       #command = "cmd /c $link_command && $manifest_command"
       command = link_command
 
       default_output_extension = ".dll"
@@ skipping 13 matching lines @@
       link_command = "$python_path gyp-win-tool link-wrapper $env False link.exe /nologo /OUT:{{output}} /PDB:{{output}}.pdb @$rspfile"
 
       # TODO(brettw) support manifests
       #manifest_command = "$python_path gyp-win-tool manifest-wrapper $env mt.exe -nologo -manifest $manifests -out:{{output}}.manifest"
       #command = "cmd /c $link_command && $manifest_command"
       command = link_command
 
       default_output_extension = ".exe"
       description = "LINK {{output}}"
       outputs = [
-        "{{target_output_name}}{{output_extension}}",
+        "{{root_out_dir}}/{{target_output_name}}{{output_extension}}",
       ]
       # The use of inputs_newline is to work around a fixed per-line buffer
       # size in the linker.
       rspfile_content = "{{inputs_newline}} {{libs}} {{solibs}} {{ldflags}}"
     }
 
     tool("stamp") {
       command = "$python_path gyp-win-tool stamp {{output}}"
       description = "STAMP {{output}}"
     }
@@ skipping 20 matching lines @@
 msvc_toolchain("32") {
   environment = "environment.x86"
   cpu_arch = "x64"
 }
 
 msvc_toolchain("64") {
   environment = "environment.x64"
   cpu_arch = "x64"
   force_win64 = true
 }