1. Figure out the modified libraries from the specifeid kernel file during

runtime/include/dart_api.h

Index: runtime/include/dart_api.h
diff --git a/runtime/include/dart_api.h b/runtime/include/dart_api.h
index 4c1d2e3a8114325151c3897fb685c54de8df2823..9b4447797d1e31e2ebef9990b93a45095562220c 100644
--- a/runtime/include/dart_api.h
+++ b/runtime/include/dart_api.h
@@ -2686,6 +2686,7 @@ typedef enum {
   Dart_kScriptTag,
   Dart_kSourceTag,
   Dart_kImportTag,
+  Dart_kKernelTag,
 } Dart_LibraryTag;
 
 /**
@@ -2725,6 +2726,15 @@ typedef enum {
  * "import" directive.  Once the script is loaded, the embedder should
  * call Dart_LoadLibrary to provide the script source to the VM.  The
  * return value should be an error or null.
+ *
+ * Dart_kKernelTag
+ *
+ * This tag is used to load the intermediate file (kernel) generated by
+ * the Dart front end. This tag is typically used when a 'hot-reload'
+ * of an application is needed and the VM is 'use dart front end' mode.
+ * The dart front end typically compiles all the scripts, imports and part
+ * files into one intermediate file hence we don't use the source/import or
+ * script tags.
  */
 typedef Dart_Handle (*Dart_LibraryTagHandler)(
     Dart_LibraryTag tag,