[gn] Add missing dep and blacklist for msan

Required for https://codereview.chromium.org/2194823002/

BUG=chromium:631979
NOTRY=true

Review-Url: https://codereview.chromium.org/2189323002
Cr-Commit-Position: refs/heads/master@{#38161}

.gitignore

@@ -64,6 +64,7 @@ shell_g
 /testing/gtest
 /third_party
 /third_party/icu
+/third_party/instrumented_libraries
 /third_party/llvm
 /third_party/llvm-build
 /tools/clang

DEPS

@@ -13,6 +13,8 @@ deps = {
     Var("git_url") + "/external/gyp.git" + "@" + "e7079f0e0e14108ab0dba58728ff219637458563",
   "v8/third_party/icu":
     Var("git_url") + "/chromium/deps/icu.git" + "@" + "b5ecbb29a26532f72ef482569b223d5a51fd50bf",
+  "v8/third_party/instrumented_libraries":
+    Var("git_url") + "/chromium/src/third_party/instrumented_libraries.git" + "@" + "7681dc666045cb84d5d2a2abe0969c01bfead993",
   "v8/buildtools":
     Var("git_url") + "/chromium/buildtools.git" + "@" + "67bf0653b2eb9eabd4fc17c4bf2df828e904a558",
   "v8/base/trace_event/common":

tools/msan/blacklist.txt

+# The rules in this file are only applied at compile time. If you can modify the
+# source in question, consider function attributes to disable instrumentation.
+#
+# Please think twice before you add or remove these rules.
\ No newline at end of file