Add more tracing to Sky

sky/engine/core/script/dart_loader.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "sky/engine/config.h"
 #include "sky/engine/core/script/dart_loader.h"
 
 #include "base/callback.h"
+#include "base/trace_event/trace_event.h"
 #include "mojo/common/data_pipe_drainer.h"
 #include "sky/engine/core/script/dart_dependency_catcher.h"
 #include "sky/engine/core/script/dom_dart_state.h"
 #include "sky/engine/platform/fetcher/MojoFetcher.h"
 #include "sky/engine/platform/weborigin/KURL.h"
 #include "sky/engine/tonic/dart_api_scope.h"
 #include "sky/engine/tonic/dart_converter.h"
 #include "sky/engine/tonic/dart_error.h"
 #include "sky/engine/tonic/dart_isolate_scope.h"
 #include "sky/engine/wtf/MainThread.h"
@@ skipping 53 matching lines @@
   }
   // Subclasses must implement OnDataComplete.
 
   KURL url_;
   MojoFetcher fetcher_;
   OwnPtr<DataPipeDrainer> drainer_;
 };
 
 class DartLoader::ImportJob : public Job {
  public:
-  using Job::Job;
+  ImportJob(DartLoader* loader, const KURL& url)
+    : Job(loader, url) {
+    TRACE_EVENT_ASYNC_BEGIN1("sky", "DartLoader::ImportJob", this,
+                             "url", url.string().ascii().toStdString());
+  }
 
  private:
   // DataPipeDrainer::Client
   void OnDataComplete() override {
+    TRACE_EVENT_ASYNC_END0("sky", "DartLoader::ImportJob", this);
     loader_->DidCompleteImportJob(this, buffer_);
   }
 };
 
 class DartLoader::SourceJob : public Job {
  public:
   SourceJob(DartLoader* loader, const KURL& url, Dart_Handle library)
-      : Job(loader, url), library_(loader->dart_state(), library) {}
+      : Job(loader, url), library_(loader->dart_state(), library) {
+    TRACE_EVENT_ASYNC_BEGIN1("sky", "DartLoader::SourceJob", this,
+                             "url", url.string().ascii().toStdString());
+  }
 
   Dart_PersistentHandle library() const { return library_.value(); }
 
  private:
   // DataPipeDrainer::Client
   void OnDataComplete() override {
+    TRACE_EVENT_ASYNC_END0("sky", "DartLoader::SourceJob", this);
     loader_->DidCompleteSourceJob(this, buffer_);
   }
 
   DartPersistentValue library_;
 };
 
 // A DependencyWatcher represents a request to watch for when a given set of
 // dependencies (either libraries or parts of libraries) have finished loading.
 // When the dependencies are satisfied (including transitive dependencies), then
 // the |callback| will be invoked.
@@ skipping 172 matching lines @@
 
   WatcherSignaler watcher_signaler(*this, job);
 
   LOG(ERROR) << "Library Load failed: " << job->url().string().utf8().data();
   // TODO(eseidel): Call Dart_LibraryHandleError in the SourceJob case?
 
   jobs_.remove(job);
 }
 
 }  // namespace blink