Store paths relative to root in Location

Bug: 134780137
Test: ./test/run_all_*_tests.sh
Change-Id: Iafd61102f8ae6ab0d7125d2a359bbe4ab1de7f3f
diff --git a/AST.h b/AST.h
index 2ccf485..aab2d16 100644
--- a/AST.h
+++ b/AST.h
@@ -68,6 +68,8 @@
     const std::string& getFilename() const;
     const Hash* getFileHash() const;
 
+    const Coordinator& getCoordinator() const;
+
     // Look up local identifier.
     // It could be plain identifier or enum value as described by lookupEnumValue.
     LocalIdentifier* lookupLocalIdentifier(const Reference<LocalIdentifier>& ref, Scope* scope);