Fix missing CRT libraries with ASAN unittests

build/config/sanitizers/BUILD.gn

Index: build/config/sanitizers/BUILD.gn
diff --git a/build/config/sanitizers/BUILD.gn b/build/config/sanitizers/BUILD.gn
index 36d45c1d1b6f1edf77020d965aec0f298c3fa702..ef644f64596414ea349332c84fa0ee0aa6270927 100644
--- a/build/config/sanitizers/BUILD.gn
+++ b/build/config/sanitizers/BUILD.gn
@@ -296,6 +296,30 @@ config("common_sanitizer_flags") {
   }
 }
 
+config("sanitizer_default_libs") {
+  # The clang sanitizers (compiler-rt/ASAN) runtime requires functions from the
+  # CRT. This config must be added to targets that are removing the default
+  # librairies using the linker options "/NOENTRY", "/ENTRY" or "/NODEFAULTLIB".

[Dirk Pranke, 2016/12/18 04:20:49]

s/librairies/libraries/

[etienneb, 2017/01/11 16:05:32]

Done.

+
+  if (is_asan && is_win) {
+    assert(!is_debug, "win/asan does not support linking with debug CRT")
+
+    if (is_component_build) {
+      libs = [
+        "msvcrt.lib",
+        "ucrt.lib",
+        "vcruntime.lib",
+      ]
+    } else {
+      libs = [
+        "libcmt.lib",
+        "libucrt.lib",
+        "libvcruntime.lib",
+      ]
+    }
+  }
+}
+
 config("asan_flags") {
   cflags = []
   if (is_asan) {