Only reload libraries when they may have been modified.

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 123064cd193eb4327e2a4e848b7127e9649227b2..a8efbdd0312a12e50f0dd7b6452e96e0914f7524 100755
--- a/runtime/include/dart_api.h
+++ b/runtime/include/dart_api.h
@@ -2716,6 +2716,7 @@ DART_EXPORT Dart_Handle Dart_DefaultCanonicalizeUrl(Dart_Handle base_url,
  *   in the first line of the Dart script.
  */
 DART_EXPORT Dart_Handle Dart_LoadScript(Dart_Handle url,

[Cutch, 2016/07/29 14:37:03]

update API documentation for these methods?

[turnidge, 2016/07/29 17:37:37]

Done, and then some.  I decided to finally write some documentation for the
LibraryTagHandler in general.

+                                        Dart_Handle resolved_url,
                                         Dart_Handle source,
                                         intptr_t line_offset,
                                         intptr_t col_offset);
@@ -2809,6 +2810,7 @@ DART_EXPORT Dart_Handle Dart_LibraryHandleError(Dart_Handle library,
 
 
 DART_EXPORT Dart_Handle Dart_LoadLibrary(Dart_Handle url,
+                                         Dart_Handle resolved_url,
                                          Dart_Handle source,
                                          intptr_t line_offset,
                                          intptr_t column_offset);
@@ -2839,6 +2841,7 @@ DART_EXPORT Dart_Handle Dart_LibraryImportLibrary(Dart_Handle library,
  */
 DART_EXPORT Dart_Handle Dart_LoadSource(Dart_Handle library,
                                         Dart_Handle url,
+                                        Dart_Handle resolved_url,
                                         Dart_Handle source,
                                         intptr_t line_offset,
                                         intptr_t column_offset);