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/class_linker_test.cc b/runtime/class_linker_test.cc
index 7b5a502..7930b48 100644
--- a/runtime/class_linker_test.cc
+++ b/runtime/class_linker_test.cc
@@ -36,6 +36,8 @@
 #include "mirror/stack_trace_element.h"
 #include "mirror/string-inl.h"
 #include "handle_scope-inl.h"
+#include "scoped_thread_state_change.h"
+#include "thread-inl.h"
 
 namespace art {