Instrumented libraries: add a hook to download pre-built binaries.

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 81519cca3177f8d8d3e7a22f20d6777c694b3c89..8675cd0bcc25bafe33ab26df2bfa62b31d4e9aea 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -438,7 +438,7 @@
       # Track where uninitialized memory originates from. From fastest to
       # slowest: 0 - no tracking, 1 - track only the initial allocation site, 2
       # - track the chain of stores leading from allocation site to use site.
-      'msan_track_origins%': 1,
+      'msan_track_origins%': 2,

[Nico, 2015/03/19 18:31:00]

unrelated?

[earthdok, 2015/03/23 13:02:56]

There haven't been any builders using msan_track_origins=1 for a while, so I've
been planning to make 2 the default. The defaults here and in
download_binaries.py must match, so might as well make the change now.

[earthdok, 2015/03/23 13:06:56]

I'll do it in a separate CL.

 
       # Enable building with UBSan (Clang's -fsanitize=undefined option).
       # -fsanitize=undefined only works with clang, but ubsan=1 implies clang=1