Add support for MSan

Add third_party/instrumented_libraries to setup_links.py
Add tools/msan/blacklist.txt which is the default location used
by MSan.

These changes are prerequisites to be able to use MSan with WebRTC.
To use it, one must also run:
sudo third_party/instrumented_libraries/install-build-deps.sh
to get the instrumented libraries installed (requires
/etc/apt/sources.list to be setup with deb-src entries).

NOTICE: Compilation is not yet working, but with this we can setup
a FYI bot to work with.

BUG=chromium:416871
TESTED=gclient sync + generate projects using:
GYP_DEFINES='msan=1 use_instrumented_libraries=1 instrumented_libraries_jobs=20' webrtc/build/gyp_webrtc
Built successfully in Release and ran a couple of tests (some crashed, some passed).

R=pbos@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/25649004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7352 4adac7df-926f-26a2-2b94-8c16560cd09d

.gitignore

@@ -73,6 +73,7 @@
 /third_party/gflags/src
 /third_party/google-visualization-python
 /third_party/icu
+/third_party/instrumented_libraries
 /third_party/jsoncpp
 /third_party/jsr-305
 /third_party/junit

setup_links.py

@@ -43,6 +43,7 @@ DIRECTORIES = [
   'third_party/drmemory',
   'third_party/expat',
   'third_party/icu',
+  'third_party/instrumented_libraries',
   'third_party/jsoncpp',
   'third_party/libc++',
   'third_party/libc++abi',

tools/msan/OWNERS

@@ -0,0 +1 @@
+*

tools/msan/blacklist.txt

@@ -0,0 +1,12 @@
+# The rules in this file are only applied at compile time.
+# Because the Chrome buildsystem does not automatically touch the files
+# mentioned here, changing this file requires clobbering all MSan bots.
+#
+# Please think twice before you add or remove these rules.
+
+# This is a stripped down copy of Chromium's blacklist.txt, to enable
+# adding WebRTC-specific blacklist entries.
+
+# Uninit in zlib. http://crbug.com/116277
+fun:*MOZ_Z_deflate*
+