Only reload libraries when they may have been modified.

runtime/vm/service.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/service.h"
 
 #include "include/dart_api.h"
 #include "include/dart_native_api.h"
 #include "platform/globals.h"
 
@@ skipping 2439 matching lines @@
   report.PrintJSON(js,
                    script,
                    TokenPosition(start_pos),
                    TokenPosition(end_pos));
   return true;
 }
 
 
 static const MethodParameter* reload_sources_params[] = {
   RUNNABLE_ISOLATE_PARAMETER,
+  new BoolParameter("force", false),
   NULL,
 };
 
 
 static bool ReloadSources(Thread* thread, JSONStream* js) {
   Isolate* isolate = thread->isolate();
   if (!isolate->compilation_allowed()) {
     js->PrintError(kFeatureDisabled,
         "Cannot reload source when running a precompiled program.");
     return true;
@@ skipping 12 matching lines @@
   if (isolate->IsReloading()) {
     js->PrintError(kIsolateIsReloading,
                    "This isolate is being reloaded.");
     return true;
   }
   if (!isolate->CanReload()) {
     js->PrintError(kFeatureDisabled,
                    "This isolate cannot reload sources right now.");
     return true;
   }
+  const bool force_reload =
+      BoolParameter::Parse(js->LookupParam("force"), false);
 
-  isolate->ReloadSources();
+  isolate->ReloadSources(force_reload);
 
   const Error& error = Error::Handle(isolate->sticky_reload_error());
 
   if (error.IsNull()) {
     PrintSuccess(js);
   } else {
     // Clear the sticky error.
     isolate->clear_sticky_reload_error();
     js->PrintError(kIsolateReloadFailed,
                    "Isolate reload failed: %s", error.ToErrorCString());
@@ skipping 1627 matching lines @@
     if (strcmp(method_name, method.name) == 0) {
       return &method;
     }
   }
   return NULL;
 }
 
 #endif  // !PRODUCT
 
 }  // namespace dart