Use msvs toolchain from depot_tools.

build/gyp_v8

Index: build/gyp_v8
diff --git a/build/gyp_v8 b/build/gyp_v8
index 8a8ffa1bdda388bca6649e3e3e61f936170308f1..8813f2c12162ba9386ff11f7e1bf79899b7a87a0 100755
--- a/build/gyp_v8
+++ b/build/gyp_v8
@@ -30,6 +30,7 @@
 # This script is wrapper for V8 that adds some support for how GYP
 # is invoked by V8 beyond what can be done in the gclient hooks.
 
+import argparse
 import glob
 import gyp_environment
 import os
@@ -37,6 +38,7 @@ import platform
 import shlex
 import subprocess
 import sys
+import vs_toolchain
 
 script_dir = os.path.dirname(os.path.realpath(__file__))
 v8_root = os.path.abspath(os.path.join(script_dir, os.pardir))
@@ -49,6 +51,25 @@ sys.path.insert(
     1, os.path.abspath(os.path.join(v8_root, 'tools', 'generate_shim_headers')))
 
 
+def GetOutputDirectory():

[Michael Achenbach, 2015/10/30 10:44:20]

1:1 c/p from chromium

+  """Returns the output directory that GYP will use."""
+
+  # Handle command line generator flags.
+  parser = argparse.ArgumentParser()
+  parser.add_argument('-G', dest='genflags', default=[], action='append')
+  genflags = parser.parse_known_args()[0].genflags
+
+  # Handle generator flags from the environment.
+  genflags += shlex.split(os.environ.get('GYP_GENERATOR_FLAGS', ''))
+
+  needle = 'output_dir='
+  for item in genflags:
+    if item.startswith(needle):
+      return item[len(needle):]
+
+  return 'out'
+
+
 def additional_include_files(args=[]):
   """
   Returns a list of additional (.gypi) files to include, without
@@ -82,6 +103,13 @@ def additional_include_files(args=[]):
 def run_gyp(args):
   rc = gyp.main(args)
 
+  vs2013_runtime_dll_dirs = vs_toolchain.SetEnvironmentAndGetRuntimeDllDirs()

[Michael Achenbach, 2015/10/30 10:44:20]

1:1 c/p from chromium

+  if vs2013_runtime_dll_dirs:
+    x64_runtime, x86_runtime = vs2013_runtime_dll_dirs
+    vs_toolchain.CopyVsRuntimeDlls(
+      os.path.join(v8_root, GetOutputDirectory()),
+      (x86_runtime, x64_runtime))
+
   if rc != 0:
     print 'Error running GYP'
     sys.exit(rc)
@@ -130,6 +158,7 @@ if __name__ == '__main__':
 
   # Generate for the architectures supported on the given platform.
   gyp_args = list(args)
+  gyp_args.extend(['-D', 'gyp_output_dir=' + GetOutputDirectory()])
   gyp_generators = os.environ.get('GYP_GENERATORS', '')
   if platform.system() == 'Linux' and gyp_generators != 'ninja':
     # Work around for crbug.com/331475.