GN threading refactor

tools/gn/gyp_target_writer.h

Index: tools/gn/gyp_target_writer.h
diff --git a/tools/gn/gyp_target_writer.h b/tools/gn/gyp_target_writer.h
index 27346b0ceea063b95ca0da4bec339b5fe68986e3..597a609c75b2613df23bba09dbbe6ec69214c2b9 100644
--- a/tools/gn/gyp_target_writer.h
+++ b/tools/gn/gyp_target_writer.h
@@ -11,6 +11,7 @@
 #include "base/basictypes.h"
 #include "tools/gn/gyp_helper.h"
 
+class BuilderRecord;
 class Err;
 class Settings;
 class SourceFile;
@@ -25,10 +26,10 @@ class GypTargetWriter {
           host_debug(NULL),
           host_release(NULL) {
     }
-    const Target* debug;
-    const Target* release;
-    const Target* host_debug;
-    const Target* host_release;
+    const BuilderRecord* debug;
+    const BuilderRecord* release;
+    const BuilderRecord* host_debug;
+    const BuilderRecord* host_release;
   };
 
   GypTargetWriter(const Target* target, std::ostream& out);