Make Win Clang ASan builds work

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/clang/clang.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/win/visual_studio_version.gni")
 import("//build/toolchain/goma.gni")
 import("//build/toolchain/toolchain.gni")
@@ skipping 267 matching lines @@
 
       # These share a name with global variables that are already defined, and
       # forward_variables_from won't clobber the existing value, so we need to
       # set it explicitly.
       if (defined(invoker.is_clang)) {
         is_clang = invoker.is_clang
       }
       if (defined(invoker.is_component_build)) {
         is_component_build = invoker.is_component_build
       }
+      if (defined(invoker.is_asan)) {
+        is_asan = invoker.is_asan
+      }
 
       # This value needs to be passed through unchanged.
       host_toolchain = host_toolchain
     }
   }
 }
 
 if (is_clang) {
   sys_include_prefix = "-imsvc"
 } else {
@@ skipping 64 matching lines @@
     environment = "environment.x64"
     toolchain_cpu = "x64"
     cl = "${goma_prefix}\"${x64_toolchain_data.vc_bin_dir}/cl.exe\""
     is_clang = false
 
     # This shares a name with a global and forward_variables_from won't clobber
     # the existing value, so we need to set it explicitly.
     if (defined(invoker.is_component_build)) {
       is_component_build = invoker.is_component_build
     }
+
+    # ASan doesn't yet work w/ 64-bit builds.
+    is_asan = false
   }
 
   msvc_toolchain("clang_" + target_name) {
     environment = "environment.x64"
     toolchain_cpu = "x64"
     prefix = rebase_path("$clang_base_path/bin", root_build_dir)
     cl = "${goma_prefix}$prefix/${clang_cl}"
     toolchain_os = "win"
     is_clang = true
+
+    # ASan doesn't yet work w/ 64-bit builds.
+    is_asan = false
+
     sys_include_flags = "${x64_toolchain_data.include_flags}"
 
     # This shares a name with a global and forward_variables_from won't clobber
     # the existing value, so we need to set it explicitly.
     if (defined(invoker.is_component_build)) {
       is_component_build = invoker.is_component_build
     }
   }
 }
 
@@ skipping 39 matching lines @@
 
   msvc_toolchain("winrt_x64") {
     environment = "environment.winrt_x64"
     cl = "${goma_prefix}\"${vc_bin_dir}/cl.exe\""
     is_clang = false
 
     toolchain_cpu = "x64"
     toolchain_os = current_os
   }
 }