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/barrier_test.cc b/runtime/barrier_test.cc
index 086ef44..de348dc 100644
--- a/runtime/barrier_test.cc
+++ b/runtime/barrier_test.cc
@@ -22,6 +22,7 @@
 #include "common_runtime_test.h"
 #include "mirror/object_array-inl.h"
 #include "thread_pool.h"
+#include "thread-inl.h"
 
 namespace art {
 class CheckWaitTask : public Task {