Introduce a monotonic_clock module for Mojo.js.

mojo/apps/js/bindings/monotonic_clock.cc

 // Copyright 2013 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 "mojo/apps/js/bindings/threading.h"
+#include "mojo/apps/js/bindings/monotonic_clock.h"
 
-#include "base/message_loop/message_loop.h"
+#include "base/time/time.h"
 #include "gin/object_template_builder.h"
 #include "gin/per_isolate_data.h"
-#include "mojo/apps/js/bindings/handle.h"
+#include "gin/public/wrapper_info.h"
 
 namespace mojo {
 namespace apps {
 
 namespace {
 
-void Quit() {
-  base::MessageLoop::current()->QuitNow();
+gin::WrapperInfo g_wrapper_info = { gin::kEmbedderNativeGin };
+
+double GetMonotonicSeconds() {
+  return static_cast<double>(
+      (base::TimeTicks::Now() -
+           base::TimeTicks::UnixEpoch()).InMicroseconds()) /
+      (base::Time::kMicrosecondsPerMillisecond *
+           base::Time::kMillisecondsPerSecond);

[abarth-chromium, 2014/01/09 00:20:46]

You don't want to call the mojo API?

[Aaron Boodman, 2014/01/09 22:34:38]

done. was worried about relying on it being microseconds, but talked to trung
and he says that is the intent.

 }
 
-gin::WrapperInfo g_wrapper_info = { gin::kEmbedderNativeGin };
-
 }  // namespace
 
-const char Threading::kModuleName[] = "mojo/apps/js/bindings/threading";
+const char MonotonicClock::kModuleName[] = "monotonic_clock";
 
-v8::Local<v8::Value> Threading::GetModule(v8::Isolate* isolate) {
+v8::Local<v8::Value> MonotonicClock::GetModule(v8::Isolate* isolate) {
   gin::PerIsolateData* data = gin::PerIsolateData::From(isolate);
-  v8::Local<v8::ObjectTemplate> templ = data->GetObjectTemplate(
-      &g_wrapper_info);
-
+  v8::Local<v8::ObjectTemplate> templ =
+      data->GetObjectTemplate(&g_wrapper_info);
   if (templ.IsEmpty()) {
     templ = gin::ObjectTemplateBuilder(isolate)
-        .SetMethod("quit", Quit)
+        .SetMethod("seconds", GetMonotonicSeconds)
         .Build();
-
     data->SetObjectTemplate(&g_wrapper_info, templ);
   }
-
   return templ->NewInstance();
 }
 
-Threading::Threading() {
-}
-
 }  // namespace apps
 }  // namespace mojo