Intorduce PowerButtonObserver API

athena/input/input_manager_unittest.cc

+// Copyright 2014 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 "athena/input/input_manager_impl.h"
+
+#include "athena/input/public/accelerator_manager.h"
+#include "athena/test/base/athena_test_base.h"
+#include "base/run_loop.h"
+#include "ui/events/test/event_generator.h"
+
+namespace athena {
+namespace {
+
+class TestPowerButtonObserver : public PowerButtonObserver {
+ public:
+  TestPowerButtonObserver() : count_(0), state_(RELEASED) {
+    InputManager::Get()->AddPowerButtonObserver(this);
+  }
+  virtual ~TestPowerButtonObserver() {
+    InputManager::Get()->RemovePowerButtonObserver(this);
+  }
+
+  int count() const { return count_; }
+  State state() const { return state_; }
+
+  bool WaitForLongPress() {
+    run_loop_.Run();
+    return state_ == LONG_PRESSED;
+  }
+
+ private:
+  virtual void OnPowerButtonStateChanged(
+      PowerButtonObserver::State state) override {
+    state_ = state;
+    count_++;
+    if (state == LONG_PRESSED) {
+      DCHECK(run_loop_.running());
+      run_loop_.Quit();
+    }
+  }
+  base::RunLoop run_loop_;
+  int count_;
+  State state_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestPowerButtonObserver);
+};
+
+}  // namespace
+
+namespace test {
+
+class ScopedPowerButtonTimeoutShortener {
+ public:
+  ScopedPowerButtonTimeoutShortener()
+      : original_timeout_(
+            GetInputManagerImpl()->SetPowerButtonTimeoutMsForTest(0)) {}
+  ~ScopedPowerButtonTimeoutShortener() {
+    GetInputManagerImpl()->SetPowerButtonTimeoutMsForTest(original_timeout_);
+  }
+
+ private:
+  InputManagerImpl* GetInputManagerImpl() {
+    return static_cast<InputManagerImpl*>(InputManager::Get());
+  }
+
+  int original_timeout_;
+  DISALLOW_COPY_AND_ASSIGN(ScopedPowerButtonTimeoutShortener);
+};
+
+}  // namespace test
+
+typedef test::AthenaTestBase InputManagerTest;
+
+TEST_F(InputManagerTest, PowerButton) {

[Jun Mukai, 2014/10/16 00:52:20]

Then can we move this test to power_button_controller_unittests?

+  test::ScopedPowerButtonTimeoutShortener shortener;
+  TestPowerButtonObserver observer;
+
+  ui::test::EventGenerator generator(root_window());
+  generator.PressKey(ui::VKEY_P, ui::EF_NONE);
+  EXPECT_EQ(0, observer.count());
+
+  // Test short press.
+  generator.PressKey(ui::VKEY_P, ui::EF_ALT_DOWN);
+  EXPECT_EQ(1, observer.count());
+  EXPECT_EQ(PowerButtonObserver::PRESSED, observer.state());
+  generator.ReleaseKey(ui::VKEY_P, ui::EF_ALT_DOWN);
+  EXPECT_EQ(2, observer.count());
+  EXPECT_EQ(PowerButtonObserver::RELEASED, observer.state());
+
+  // Test long press.
+  generator.PressKey(ui::VKEY_P, ui::EF_ALT_DOWN);
+  EXPECT_EQ(3, observer.count());
+  EXPECT_EQ(PowerButtonObserver::PRESSED, observer.state());
+
+  EXPECT_TRUE(observer.WaitForLongPress());
+  EXPECT_EQ(4, observer.count());
+  EXPECT_EQ(PowerButtonObserver::LONG_PRESSED, observer.state());
+
+  generator.ReleaseKey(ui::VKEY_P, ui::EF_ALT_DOWN);
+  EXPECT_EQ(5, observer.count());
+  EXPECT_EQ(PowerButtonObserver::RELEASED, observer.state());
+}
+
+}  // namespace athena