Reland of Improve linearized pdf load/show time.

pdf/timer.cc

Index: pdf/timer.cc
diff --git a/pdf/timer.cc b/pdf/timer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a6890b245bf740d68a76a8464bf51309f49d9cc3
--- /dev/null
+++ b/pdf/timer.cc
@@ -0,0 +1,31 @@
+// Copyright 2016 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 "pdf/timer.h"
+
+#include "ppapi/cpp/core.h"
+#include "ppapi/cpp/module.h"
+
+namespace chrome_pdf {
+
+Timer::Timer(int delay_in_milliseconds)
+    : delay_(delay_in_milliseconds), callback_factory_(this) {
+  PostCallback();
+}
+
+Timer::~Timer() {
+}
+
+void Timer::PostCallback() {
+  pp::CompletionCallback callback =
+      callback_factory_.NewCallback(&Timer::TimerProc);
+  pp::Module::Get()->core()->CallOnMainThread(delay_, callback, 0);
+}
+
+void Timer::TimerProc(int32_t /*result*/) {
+  PostCallback();
+  OnTimer();
+}
+
+}  // namespace chrome_pdf