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

runtime/vm/kernel_reader.h

Index: runtime/vm/kernel_reader.h
diff --git a/runtime/vm/kernel_reader.h b/runtime/vm/kernel_reader.h
index ec3aab16f057c2af5a0502af4d1dcdc6f66d04ee..4ac76c569f0191583c8f0566b4d5c2f55c3df775 100644
--- a/runtime/vm/kernel_reader.h
+++ b/runtime/vm/kernel_reader.h
@@ -60,6 +60,12 @@ class KernelReader {
   // was no main procedure, or a failure object if there was an error.
   dart::Object& ReadProgram();
 
+  // Finds all libraries that have been modified in this incremental
+  // version of the kernel program file.
+  void FindModifiedLibraries(Isolate* isolate,
+                             BitVector* modified_libs,
+                             bool force_reload);
+
   void ReadLibrary(intptr_t kernel_offset);
 
   const dart::String& DartSymbol(StringIndex index) {