Tablet-like power button behavior on Convertible/Tablet ChromeOS devices

chromeos/dbus/fake_power_manager_client.cc

 // Copyright (c) 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 "chromeos/dbus/fake_power_manager_client.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/location.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/time/time.h"
 
 namespace chromeos {
 
 namespace {
 // Minimum power for a USB power source to be classified as AC.
-const double kUsbMinAcWatts = 24;
+constexpr double kUsbMinAcWatts = 24;
+
+// A non-zero brightness used for test.
+constexpr int kNonZeroBrightnessForTest = 10;
 }
 
 FakePowerManagerClient::FakePowerManagerClient()
     : num_request_restart_calls_(0),
       num_request_shutdown_calls_(0),
       num_set_policy_calls_(0),
       num_set_is_projecting_calls_(0),
       num_pending_suspend_readiness_callbacks_(0),
       is_projecting_(false),
       backlights_forced_off_(false),
@@ skipping 102 matching lines @@
               : power_manager::PowerSupplyProperties_ExternalPower_AC);
       break;
     }
   }
 
   NotifyObservers();
 }
 
 void FakePowerManagerClient::SetBacklightsForcedOff(bool forced_off) {
   backlights_forced_off_ = forced_off;
+  forced_off ? SendBrightnessChanged(0, true)
+             : SendBrightnessChanged(kNonZeroBrightnessForTest, true);
 }
 
 void FakePowerManagerClient::GetBacklightsForcedOff(
     const GetBacklightsForcedOffCallback& callback) {
   base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE, base::Bind(callback, backlights_forced_off_));
 }
 
 base::Closure FakePowerManagerClient::GetSuspendReadinessCallback() {
   ++num_pending_suspend_readiness_callbacks_;
@@ skipping 39 matching lines @@
   for (auto& observer : observers_)
     observer.PowerButtonEventReceived(down, timestamp);
 }
 
 void FakePowerManagerClient::UpdatePowerProperties(
     const power_manager::PowerSupplyProperties& power_props) {
   props_ = power_props;
   NotifyObservers();
 }
 
+void FakePowerManagerClient::SendBrightnessChanged(int level,
+                                                   bool user_initiated) {
+  for (auto& observer : observers_)
+    observer.BrightnessChanged(level, user_initiated);
+}
+
 void FakePowerManagerClient::NotifyObservers() {
   for (auto& observer : observers_)
     observer.PowerChanged(props_);
 }
 
 void FakePowerManagerClient::HandleSuspendReadiness() {
   CHECK(num_pending_suspend_readiness_callbacks_ > 0);
 
   --num_pending_suspend_readiness_callbacks_;
 }
 
 }  // namespace chromeos