Allow setting breakpoints in literal function initializers of fields.

runtime/vm/debugger.h

Index: runtime/vm/debugger.h
diff --git a/runtime/vm/debugger.h b/runtime/vm/debugger.h
index 6f4bd40e13a053580836c3c60d9099f96908412e..b03ed34793938538e1ec372cea56beea63b6e61c 100644
--- a/runtime/vm/debugger.h
+++ b/runtime/vm/debugger.h
@@ -632,6 +632,9 @@ class Debugger {
                              TokenPosition end_pos,
                              GrowableObjectArray* function_list);
   RawFunction* FindBestFit(const Script& script, TokenPosition token_pos);
+  bool MatchesLiteralFunctionPos(const Script& script,
+                                 TokenPosition token_pos,
+                                 TokenPosition last_token_pos);
   RawFunction* FindInnermostClosure(const Function& function,
                                     TokenPosition token_pos);
   TokenPosition ResolveBreakpointPos(const Function& func,