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..d7e571e3d3c911e3ab4ec4894c1a09c61cd8c5b3 100644
--- a/runtime/vm/debugger.h
+++ b/runtime/vm/debugger.h
@@ -631,7 +631,10 @@ class Debugger {
                              TokenPosition start_pos,
                              TokenPosition end_pos,
                              GrowableObjectArray* function_list);
-  RawFunction* FindBestFit(const Script& script, TokenPosition token_pos);
+  bool FindBestFit(const Script& script,
+                   TokenPosition token_pos,
+                   TokenPosition last_token_pos,
+                   Function* best_fit);
   RawFunction* FindInnermostClosure(const Function& function,
                                     TokenPosition token_pos);
   TokenPosition ResolveBreakpointPos(const Function& func,