Installing libc++ in the board sysroot results in failed ImageTest.
https://uberchromegw.corp.google.com/i/chromiumos.tryserver/builders/release/builds/13826/steps/ImageTest/logs/stdio
AssertionError: File dir-ROOT-A/usr/include/c++/v1/array has blacklisted type text/x-c++.
File dir-ROOT-A/usr/include/c++/v1/ciso646 has blacklisted type text/x-c.
File dir-ROOT-A/usr/include/c++/v1/__debug has blacklisted type text/x-c++.
File dir-ROOT-A/usr/include/c++/v1/sstream has blacklisted type text/x-c++.
File dir-ROOT-A/usr/include/c++/v1/istream has blacklisted type text/x-c++.
File dir-ROOT-A/usr/include/c++/v1/cmath has blacklisted type text/x-c.
File dir-ROOT-A/usr/include/c++/v1/cstdbool has blacklisted type text/x-c.
File dir-ROOT-A/usr/include/c++/v1/thread has blacklisted type text/x-c++.
File dir-ROOT-A/usr/include/c++/v1/iostream has blacklisted type text/x-c.
Comment 1 by bugdroid1@chromium.org
, Aug 18 2017