Linux Sandbox: get everything to compile on Android.

We define our own android_arm_ucontext.h file since
signal.h doesn't define ucontext_t on Android.

BUG=166704
NOTRY=true


Review URL: https://chromiumcodereview.appspot.com/11618010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@174070 0039d316-1c4b-4281-b951-d872f2087c98
5 files changed