Enable service isolate under precompilation

Update dart revision to include changes required to enable profiling
during precompilation

DEPS

@@ -25,7 +25,7 @@ vars = {
 
   # Note: When updating the Dart revision, ensure that all entries that are
   # dependencies of dart are also updated
-  'dart_revision': '2bf488f9e753ecd5418799c5f0508856670b46aa',
+  'dart_revision': '37dd876bf1a6e6854abc85ebdd9c513e03743580',
   'dart_observatory_packages_revision': '5c199c5954146747f75ed127871207718dc87786',
   'dart_root_certificates_revision': 'c3a41df63afacec62fcb8135196177e35fe72f71',
 

sky/engine/bindings/bindings.gni

@@ -105,6 +105,8 @@ template("dart_precompile") {
         rebase_path("//sky/engine/bindings/internals.dart")
     dart_ui_path =
         rebase_path("$root_build_dir/gen/sky/bindings/dart_ui.dart")
+    service_path =
+        rebase_path("//sky/engine/core/script/dart_service_isolate/main.dart")
 
     gen_snapshot_dir =
         get_label_info("//dart/runtime/bin:gen_snapshot($dart_host_toolchain)",
@@ -131,6 +133,7 @@ template("dart_precompile") {
       "--url_mapping=dart:mojo.internal,$dart_mojo_internal_path",
       "--url_mapping=dart:ui,$dart_ui_path",
       "--url_mapping=dart:ui_internals,$dart_ui_internals_path",
+      "--url_mapping=dart:vmservice_sky,$service_path",
     ]
   }
 

sky/engine/bindings/dart_vm_entry_points.txt

@@ -40,3 +40,6 @@ dart:ui_internals,::,takeServiceRegistry
 dart:ui_internals,::,takeServicesProvidedByEmbedder
 dart:ui_internals,::,takeServicesProvidedToEmbedder
 dart:ui_internals,::,takeShellProxyHandle
+dart:vmservice_sky,::,_addResource
+dart:vmservice_sky,::,boot
+dart:vmservice_sky,::,main

sky/engine/core/script/dart_init.cc

@@ -155,12 +155,12 @@ Dart_Isolate IsolateCreateCallback(const char* script_uri,
       // Start the handle watcher from the service isolate so it isn't available
       // for debugging or general Observatory interaction.
       EnsureHandleWatcherStarted();
-      if (!IsRunningPrecompiledCode() &&
-          RuntimeEnabledFeatures::observatoryEnabled()) {
+      if (RuntimeEnabledFeatures::observatoryEnabled()) {
         std::string ip = "127.0.0.1";
         const intptr_t port = 8181;
         const bool service_isolate_booted =
-            DartServiceIsolate::Startup(ip, port, DartLibraryTagHandler, error);
+            DartServiceIsolate::Startup(ip, port, DartLibraryTagHandler,
+                                        IsRunningPrecompiledCode(), error);
         CHECK(service_isolate_booted) << error;
       }
     }

sky/engine/core/script/dart_service_isolate.cc

@@ -118,6 +118,7 @@ void DartServiceIsolate::Shutdown(Dart_NativeArguments args) {
 bool DartServiceIsolate::Startup(std::string server_ip,
                                  intptr_t server_port,
                                  Dart_LibraryTagHandler embedder_tag_handler,
+                                 bool running_precompiled,
                                  char** error) {
   Dart_Isolate isolate = Dart_CurrentIsolate();
   CHECK(isolate);
@@ -138,19 +139,29 @@ bool DartServiceIsolate::Startup(std::string server_ip,
 
   Dart_Handle result;
 
-  // Use our own library tag handler when loading service isolate sources.
-  Dart_SetLibraryTagHandler(DartServiceIsolate::LibraryTagHandler);
-  // Load main script.
-  Dart_Handle library = LoadScript(kServiceIsolateScript);
-  DCHECK(library != Dart_Null());
-  SHUTDOWN_ON_ERROR(library);
-  // Setup native entry resolution.
-  result = Dart_SetNativeResolver(library, GetNativeFunction, GetSymbol);
-
-  SHUTDOWN_ON_ERROR(result);
-  // Finalize loading.
-  result = Dart_FinalizeLoading(false);
-  SHUTDOWN_ON_ERROR(result);
+  if (running_precompiled) {
+    Dart_Handle uri = Dart_NewStringFromCString("dart:vmservice_sky");
+    Dart_Handle library = Dart_LookupLibrary(uri);
+    SHUTDOWN_ON_ERROR(library);
+    result = Dart_SetRootLibrary(library);
+    SHUTDOWN_ON_ERROR(result);
+    result = Dart_SetNativeResolver(library, GetNativeFunction, GetSymbol);
+    SHUTDOWN_ON_ERROR(result);
+  } else {
+    // Use our own library tag handler when loading service isolate sources.
+    Dart_SetLibraryTagHandler(DartServiceIsolate::LibraryTagHandler);
+    // Load main script.
+    Dart_Handle library = LoadScript(kServiceIsolateScript);
+    DCHECK(library != Dart_Null());
+    SHUTDOWN_ON_ERROR(library);
+    // Setup native entry resolution.
+    result = Dart_SetNativeResolver(library, GetNativeFunction, GetSymbol);
+
+    SHUTDOWN_ON_ERROR(result);
+    // Finalize loading.
+    result = Dart_FinalizeLoading(false);
+    SHUTDOWN_ON_ERROR(result);
+  }
 
   // Make runnable.
   Dart_ExitScope();
@@ -165,7 +176,7 @@ bool DartServiceIsolate::Startup(std::string server_ip,
   Dart_EnterIsolate(isolate);
   Dart_EnterScope();
 
-  library = Dart_RootLibrary();
+  Dart_Handle library = Dart_RootLibrary();
   SHUTDOWN_ON_ERROR(library);
 
   // Set the HTTP server's ip.
@@ -266,8 +277,8 @@ Dart_Handle DartServiceIsolate::LoadResources(Dart_Handle library) {
 }
 
 Dart_Handle DartServiceIsolate::LibraryTagHandler(Dart_LibraryTag tag,
-                                         Dart_Handle library,
-                                         Dart_Handle url) {
+                                                  Dart_Handle library,
+                                                  Dart_Handle url) {
   if (!Dart_IsLibrary(library)) {
     return Dart_NewApiError("not a library");
   }

sky/engine/core/script/dart_service_isolate.h

@@ -18,6 +18,7 @@ class DartServiceIsolate {
   static bool Startup(std::string server_ip,
                       intptr_t server_port,
                       Dart_LibraryTagHandler embedder_tag_handler,
+                      bool running_precompiled,
                       char** error);
 
  private: