Add support for testing content in SkyView

sky/engine/tonic/dart_timer_heap.cc

Index: sky/engine/tonic/dart_timer_heap.cc
diff --git a/sky/engine/tonic/dart_timer_heap.cc b/sky/engine/tonic/dart_timer_heap.cc
new file mode 100644
index 0000000000000000000000000000000000000000..733ede3a6e8b2f772fd15dbb12518f5d38aa7ddb
--- /dev/null
+++ b/sky/engine/tonic/dart_timer_heap.cc
@@ -0,0 +1,56 @@
+// 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/tonic/dart_timer_heap.h"
+
+#include "base/bind.h"
+#include "base/message_loop/message_loop.h"
+#include "base/time/time.h"
+#include "sky/engine/tonic/dart_api_scope.h"
+#include "sky/engine/tonic/dart_invoke.h"
+#include "sky/engine/tonic/dart_isolate_scope.h"
+#include "sky/engine/tonic/dart_state.h"
+
+namespace blink {
+
+DartTimerHeap::DartTimerHeap() : next_timer_id_(1), weak_factory_(this) {
+}
+
+DartTimerHeap::~DartTimerHeap() {
+}
+
+int DartTimerHeap::Add(PassOwnPtr<Task> task) {
+  int id = next_timer_id_++;
+  Schedule(id, task);
+  return id;
+}
+
+void DartTimerHeap::Remove(int id) {
+  heap_.remove(id);
+}
+
+void DartTimerHeap::Schedule(int id, PassOwnPtr<Task> task) {
+  base::TimeDelta delay = task->delay;
+  heap_.add(id, task);
+  base::MessageLoop::current()->PostDelayedTask(FROM_HERE,
+    base::Bind(&DartTimerHeap::Run, weak_factory_.GetWeakPtr(), id), delay);
+}
+
+void DartTimerHeap::Run(int id) {
+  auto it = heap_.find(id);
+  if (it == heap_.end())
+    return;
+  OwnPtr<Task> task = it->value.release();
+  heap_.remove(it);
+  if (!task->closure.dart_state())
+    return;
+  DartIsolateScope scope(task->closure.dart_state()->isolate());
+  DartApiScope api_scope;
+  DartInvokeAppClosure(task->closure.value(), 0, nullptr);
+  if (task->repeating)
+    Schedule(id, task.release());
+}
+
+}