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..521a8d682fde41f6b4c91fae8640690c49e159ff
--- /dev/null
+++ b/pdf/timer.cc
@@ -0,0 +1,77 @@
+// Copyright (c) 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 {
+
+static TestTimerRunner* g_test_timer_runner = nullptr;
+
+Timer::Timer(int delay) : delay_(delay), callback_factory_(this) {
+  PostCallback();
+}
+
+Timer::~Timer() {
+  if (g_test_timer_runner) {
+    g_test_timer_runner->UnregisterTimer(this);
+  }
+}
+
+void Timer::PostCallback() {
+  if (g_test_timer_runner) {
+    g_test_timer_runner->RegisterTimer(this);
+  } else {
+    pp::CompletionCallback callback =
+        callback_factory_.NewCallback(&Timer::TimerProc);
+    pp::Module::Get()->core()->CallOnMainThread(delay_, callback, 0);
+  }
+}
+
+void Timer::TimerProc(int32_t /*result*/) {
+  PostCallback();
+  OnTimer();
+}
+
+TestTimerRunner::TestTimerRunner() {
+  PP_DCHECK(!g_test_timer_runner);
+  g_test_timer_runner = this;
+}
+
+TestTimerRunner::~TestTimerRunner() {
+  PP_DCHECK(scheduled_timers_.empty());
+  PP_DCHECK(g_test_timer_runner == this);
+  g_test_timer_runner = nullptr;
+}
+
+void TestTimerRunner::RunUntilIdle() {
+  while (!scheduled_timers_.empty()) {
+    RunScheduled();
+  }
+}
+
+void TestTimerRunner::RunScheduled() {
+  auto saved_timers = scheduled_timers_;
+  for (auto& it : saved_timers) {
+    if (scheduled_timers_.count(it)) {
+      it->TimerProc(0);
+    }
+  }
+}
+
+int TestTimerRunner::scheduled_count() const {
+  return static_cast<int>(scheduled_timers_.size());
+}
+
+void TestTimerRunner::RegisterTimer(Timer* timer) {
+  scheduled_timers_.insert(timer);
+}
+
+void TestTimerRunner::UnregisterTimer(Timer* timer) {
+  scheduled_timers_.erase(timer);
+}
+
+}  // namespace chrome_pdf