Device Service: Decouple Wake Lock from //content

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"
 #include "mojo/public/cpp/bindings/strong_binding.h"
 
 namespace device {
 
+namespace {
+
+const int kInvalidContextId = -1;
+}
+
 WakeLockServiceContext::WakeLockServiceContext(
+    mojom::WakeLockServiceContextRequest request,
     scoped_refptr<base::SingleThreadTaskRunner> file_task_runner,
-    base::Callback<gfx::NativeView()> native_view_getter)
+    WakeLockContextCallback native_view_getter)
     : main_task_runner_(base::ThreadTaskRunnerHandle::Get()),
       file_task_runner_(file_task_runner),
+      context_id_(kInvalidContextId),
       num_lock_requests_(0),
       native_view_getter_(native_view_getter),
-      weak_factory_(this) {}
+      binding_(this, std::move(request)),
+      num_connections_(1),
+      weak_factory_(this) {
+  binding_.set_connection_error_handler(base::Bind(
+      &WakeLockServiceContext::OnConnectionError, base::Unretained(this)));
+}
 
 WakeLockServiceContext::~WakeLockServiceContext() {}
 
-void WakeLockServiceContext::CreateService(
+void WakeLockServiceContext::SetContextID(int context_id) {
+  context_id_ = context_id;
+}
+
+void WakeLockServiceContext::BindWakeLock(
     mojo::InterfaceRequest<mojom::WakeLockService> request) {
-  mojo::MakeStrongBinding(
-      base::MakeUnique<WakeLockServiceImpl>(weak_factory_.GetWeakPtr()),
-      std::move(request));
+  num_connections_++;
+  mojo::StrongBindingPtr<mojom::WakeLockService> binding =
+      mojo::MakeStrongBinding(
+          base::MakeUnique<WakeLockServiceImpl>(weak_factory_.GetWeakPtr()),
+          std::move(request));
+  binding->set_connection_error_handler(base::Bind(
+      &WakeLockServiceContext::OnConnectionError, base::Unretained(this)));
 }
 
 void WakeLockServiceContext::RequestWakeLock() {
   DCHECK(main_task_runner_->RunsTasksOnCurrentThread());
   num_lock_requests_++;
   UpdateWakeLock();
 }
 
 void WakeLockServiceContext::CancelWakeLock() {
   DCHECK(main_task_runner_->RunsTasksOnCurrentThread());
   num_lock_requests_--;
   UpdateWakeLock();
 }
 
-bool WakeLockServiceContext::HasWakeLockForTests() const {
-  return !!wake_lock_;
+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();
+  if (context_id_ == kInvalidContextId)
+    return;
+
+  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();
   }
 }
 
+void WakeLockServiceContext::OnConnectionError() {
+  DCHECK(num_connections_ > 0);
+  num_connections_--;
+  if (num_connections_ == 0)
+    delete this;
+}
+
 }  // namespace device