Replace intptr_t with TokenDescriptor

runtime/vm/json_stream.h

Index: runtime/vm/json_stream.h
diff --git a/runtime/vm/json_stream.h b/runtime/vm/json_stream.h
index 95d2041a8d79e01ae70f6f8d96b3dada8832c547..9ca5703b49f448dfaa99e2eb86e808d0e2fa228c 100644
--- a/runtime/vm/json_stream.h
+++ b/runtime/vm/json_stream.h
@@ -9,6 +9,7 @@
 #include "platform/text_buffer.h"
 #include "vm/allocation.h"
 #include "vm/service.h"
+#include "vm/token_descriptor.h"
 
 
 namespace dart {
@@ -240,9 +241,10 @@ class JSONObject : public ValueObject {
 
   void AddFixedServiceId(const char* format, ...) const PRINTF_ATTRIBUTE(2, 3);
 
-  void AddLocation(const Script& script,
-                   intptr_t token_pos,
-                   intptr_t end_token_pos = -1) const;
+  void AddLocation(
+      const Script& script,
+      TokenDescriptor token_pos,
+      TokenDescriptor end_token_pos = TokenDescriptor::kNoSource) const;
 
   void AddLocation(const BreakpointLocation* bpt_loc) const;