Break apart header files.

Create libart-gtest for common runtime and compiler gtest routines.
Rename CompilerCallbacksImpl that is quick compiler specific.
Rename trace clock source constants to not use the overloaded profiler term.

Change-Id: I4aac4bdc7e7850c68335f81e59a390133b54e933
diff --git a/runtime/instrumentation.cc b/runtime/instrumentation.cc
index 05320ce..e3d32bb 100644
--- a/runtime/instrumentation.cc
+++ b/runtime/instrumentation.cc
@@ -18,6 +18,7 @@
 
 #include <sys/uio.h>
 
+#include "arch/context.h"
 #include "atomic.h"
 #include "base/unix_file/fd_file.h"
 #include "class_linker.h"