Add support for generating the QtCreator projects from GN.

tools/gn/import_manager.h

Index: tools/gn/import_manager.h
diff --git a/tools/gn/import_manager.h b/tools/gn/import_manager.h
index 70aeee727c507b771c0b4090af5f273e4717ca14..b6a012c2cfb7b7409a17ee2642f8f4a7c4ea28c6 100644
--- a/tools/gn/import_manager.h
+++ b/tools/gn/import_manager.h
@@ -6,6 +6,7 @@
 #define TOOLS_GN_IMPORT_MANAGER_H_
 
 #include <map>
+#include <vector>
 
 #include "base/macros.h"
 #include "base/synchronization/lock.h"
@@ -29,6 +30,8 @@ class ImportManager {
                 Scope* scope,
                 Err* err);
 
+  std::vector<SourceFile> GetImportedFiles() const;
+
  private:
   base::Lock lock_;