Support breakpoints in deferred libraries

runtime/vm/dart_api_impl.cc

Index: runtime/vm/dart_api_impl.cc
===================================================================
--- runtime/vm/dart_api_impl.cc	(revision 42490)
+++ runtime/vm/dart_api_impl.cc	(working copy)
@@ -14,6 +14,7 @@
 #include "vm/dart_api_message.h"
 #include "vm/dart_api_state.h"
 #include "vm/dart_entry.h"
+#include "vm/debugger.h"
 #include "vm/debuginfo.h"
 #include "vm/exceptions.h"
 #include "vm/flags.h"
@@ -5310,6 +5311,13 @@
     return state;
   }
 
+  // Now that the newly loaded classes are finalized, notify the debugger
+  // that new code has been loaded. If there are latent breakpoints in
+  // the new code, the debugger convert them to unresolved source breakpoints.
+  // The code that completes the futures (invoked below) may call into the
+  // newly loaded code and trigger one of these breakpoints.
+  isolate->debugger()->NotifyDoneLoading();
+
   if (complete_futures) {
     const Library& corelib = Library::Handle(isolate, Library::CoreLibrary());
     const String& function_name =