Improve linearized pdf load/show time.

pdf/timer.cc

+// 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) : delay_(delay), 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