[infra] Assembles the SDK using GN rather than create_sdk.py

build/config/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")
 
 # Compiler setup for the Windows SDK. Applied to all targets.
 config("sdk") {
   # The include path is the stuff returned by the script.
   #include_dirs = msvc_config[0]  TODO(brettw) make this work.
@@ skipping 55 matching lines @@
     "/ignore:4199",
     "/ignore:4221",
     "/ignore:4197",  # Disable multiple Dart_True export warning.
     "/NXCOMPAT",
 
     # Suggested by Microsoft Devrel to avoid
     #   LINK : fatal error LNK1248: image size (80000000)
     #   exceeds maximum allowable size (80000000)
     # which started happening more regularly after VS2013 Update 4.
     "/maxilksize:2147483647",
+
+    # Force the creation of a .lib file for all executable() targets.
+    "/EXPORT:main",
   ]
 
   # ASLR makes debugging with windbg difficult because Chrome.exe and
   # Chrome.dll share the same base name. As result, windbg will name the
   # Chrome.dll module like chrome_<base address>, where <base address>
   # typically changes with each launch. This in turn means that breakpoints in
   # Chrome.dll don't stick from one launch to the next. For this reason, we
   # turn ASLR off in debug builds.
   if (is_debug) {
     ldflags += [ "/DYNAMICBASE:NO" ]
@@ skipping 79 matching lines @@
 
 # Nominmax --------------------------------------------------------------------
 
 # Some third party code defines NOMINMAX before including windows.h, which
 # then causes warnings when it's been previously defined on the command line.
 # For such targets, this config can be removed.
 
 config("nominmax") {
   defines = [ "NOMINMAX" ]
 }