[Mac/GN][sanitizers] Copy the ASan runtime to the output directory.

base/BUILD.gn

Index: base/BUILD.gn
diff --git a/base/BUILD.gn b/base/BUILD.gn
index c5bcc1d619258a710b7457b098470a7f8127ed80..67fac3c88b70e0240abffa7c430ac2343c7b0d20 100644
--- a/base/BUILD.gn
+++ b/base/BUILD.gn
@@ -1288,11 +1288,6 @@ component("base") {
       "strings/sys_string_conversions_posix.cc",
       "threading/platform_thread_internal_posix.cc",
     ]
-
-    if (is_asan) {
-      # TODO(GYP) hook up asan on Mac. GYP has this extra dylib:
-      #data += [ "$root_out_dir/libclang_rt.asan_osx_dynamic.dylib" ]
-    }

[Nico, 2016/05/10 21:43:37]

I think the reason this was here is probably because base.isolate lists this
(https://code.google.com/p/chromium/codesearch#chromium/src/base/base.isolate&...).
base/BUILD.gn also copies all the Windows dlls to the build output dir
(https://code.google.com/p/chromium/codesearch#chromium/src/base/BUILD.gn&l=1190).

[Robert Sesek, 2016/05/12 18:35:45]

In GN, the isolate files are built from the data[] lists on targets. Because
this depends on the //build/config/sanitizer:deps it gets the data_deps[] from
that target, which includes the ASan runtime. That way all targets that depend
on the sanitizers should get the runtime as a data[].

   } else {
     # Non-Mac/ios.
     sources -= [