HTTP loading tests and package root support

runtime/bin/dartutils.cc

Index: runtime/bin/dartutils.cc
diff --git a/runtime/bin/dartutils.cc b/runtime/bin/dartutils.cc
index 4bd4c98d0b401c7d9a9199593d0c8c1ae8207537..7ae9a6901c19fefeb12313629a4fb2200bf1228b 100644
--- a/runtime/bin/dartutils.cc
+++ b/runtime/bin/dartutils.cc
@@ -543,14 +543,18 @@ Dart_Handle DartUtils::LoadScriptHttp(Dart_Handle uri,
 
 Dart_Handle DartUtils::LoadScript(const char* script_uri,
                                   Dart_Handle builtin_lib) {
-  if (DartUtils::IsHttpSchemeURL(script_uri)) {
-    return LoadScriptHttp(NewString(script_uri), builtin_lib);
-  }
-  Dart_Handle resolved_script_uri;
-  resolved_script_uri = ResolveScriptUri(NewString(script_uri), builtin_lib);
+  // Always call ResolveScriptUri because as a side effect it sets
+  // the script entry path which is used when automatically resolving
+  // package root.
+  Dart_Handle resolved_script_uri =
+      ResolveScriptUri(NewString(script_uri), builtin_lib);
   if (Dart_IsError(resolved_script_uri)) {
     return resolved_script_uri;
   }
+  // Handle http: requests separately.
+  if (DartUtils::IsHttpSchemeURL(script_uri)) {
+    return LoadScriptHttp(resolved_script_uri, builtin_lib);
+  }
   Dart_Handle script_path = DartUtils::FilePathFromUri(resolved_script_uri,
                                                        builtin_lib);
   if (Dart_IsError(script_path)) {