Move ownership of PowerSaveBlocker from WakeLockServiceContext to WakeLockServiceImpl

device/wake_lock/wake_lock_service_context.cc

 // Copyright 2015 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 "device/wake_lock/wake_lock_service_context.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "build/build_config.h"
 #include "device/power_save_blocker/power_save_blocker.h"
 
 namespace device {
 
 WakeLockServiceContext::WakeLockServiceContext(
     mojom::WakeLockContextRequest request,
     int context_id,
     scoped_refptr<base::SingleThreadTaskRunner> file_task_runner,
     const WakeLockContextCallback& native_view_getter)
-    : main_task_runner_(base::ThreadTaskRunnerHandle::Get()),
-      file_task_runner_(std::move(file_task_runner)),
-      num_lock_requests_(0),
-#if defined(OS_ANDROID)
+    : file_task_runner_(std::move(file_task_runner)),
+      wake_lock_count_(0),
       context_id_(context_id),
       native_view_getter_(native_view_getter),
-#endif
       context_binding_(this, std::move(request)),
       context_binding_encountered_error_(false) {
   context_binding_.set_connection_error_handler(base::Bind(
       &WakeLockServiceContext::OnContextBindingError, base::Unretained(this)));
   wake_lock_bindings_.set_connection_error_handler(
       base::Bind(&WakeLockServiceContext::DestroyIfNoLongerNeeded,
                  base::Unretained(this)));
 }
 
 WakeLockServiceContext::~WakeLockServiceContext() {}
 
 void WakeLockServiceContext::GetWakeLock(
-    mojo::InterfaceRequest<mojom::WakeLockService> request) {
-  wake_lock_bindings_.AddBinding(base::MakeUnique<WakeLockServiceImpl>(this),
-                                 std::move(request));
+    device::PowerSaveBlocker::PowerSaveBlockerType type,
+    device::PowerSaveBlocker::Reason reason,
+    const std::string& description,
+    mojom::WakeLockServiceRequest request) {
+  wake_lock_bindings_.AddBinding(
+      base::MakeUnique<WakeLockServiceImpl>(this, type, reason, description,
+                                            context_id_, native_view_getter_,
+                                            file_task_runner_),
+      std::move(request));
 }
 
-void WakeLockServiceContext::RequestWakeLock() {
-  DCHECK(main_task_runner_->RunsTasksOnCurrentThread());
-  num_lock_requests_++;
-  UpdateWakeLock();
+void WakeLockServiceContext::IncreaseWakeLockCount() {
+  DCHECK(wake_lock_count_ >= 0);
+  ++wake_lock_count_;
 }
 
-void WakeLockServiceContext::CancelWakeLock() {
-  DCHECK(main_task_runner_->RunsTasksOnCurrentThread());
-  num_lock_requests_--;
-  UpdateWakeLock();
+void WakeLockServiceContext::DecreaseWakeLockCount() {
+  DCHECK(wake_lock_count_ > 0);
+  --wake_lock_count_;
 }
 
 void WakeLockServiceContext::HasWakeLockForTests(
     const HasWakeLockForTestsCallback& callback) {
-  callback.Run(!!wake_lock_);
-}
-
-void WakeLockServiceContext::CreateWakeLock() {
-  DCHECK(!wake_lock_);
-  wake_lock_.reset(new device::PowerSaveBlocker(
-      device::PowerSaveBlocker::kPowerSaveBlockPreventDisplaySleep,
-      device::PowerSaveBlocker::kReasonOther, "Wake Lock API",
-      main_task_runner_, file_task_runner_));
-
-#if defined(OS_ANDROID)
-  gfx::NativeView native_view = native_view_getter_.Run(context_id_);
-  if (native_view) {
-    wake_lock_.get()->InitDisplaySleepBlocker(native_view);
-  }
-#endif
-}
-
-void WakeLockServiceContext::RemoveWakeLock() {
-  DCHECK(wake_lock_);
-  wake_lock_.reset();
-}
-
-void WakeLockServiceContext::UpdateWakeLock() {
-  DCHECK(num_lock_requests_ >= 0);
-  if (num_lock_requests_) {
-    if (!wake_lock_)
-      CreateWakeLock();
-  } else {
-    if (wake_lock_)
-      RemoveWakeLock();
-  }
+  callback.Run(!!wake_lock_count_);
 }
 
 void WakeLockServiceContext::OnContextBindingError() {
   context_binding_encountered_error_ = true;
   DestroyIfNoLongerNeeded();
 }
 
 void WakeLockServiceContext::DestroyIfNoLongerNeeded() {
   if (context_binding_encountered_error_ && wake_lock_bindings_.empty()) {
     // Delete this instance once there are no more live connections to it.
     // However, ensure that this instance stays alive throughout the destructor
     // of a WakeLockServiceImpl instance that might be triggering this callback.
     base::ThreadTaskRunnerHandle::Get()->DeleteSoon(FROM_HERE, this);
   }
 }
 
 }  // namespace device