Revert of Move //device/generic_sensor to be part of the internal implementation of the Device Service.

device/generic_sensor/sensor_provider_impl.cc

+// Copyright 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 "device/generic_sensor/sensor_provider_impl.h"
+
+#include <utility>
+
+#include "base/memory/ptr_util.h"
+#include "base/threading/thread_task_runner_handle.h"
+#include "device/generic_sensor/platform_sensor_provider.h"
+#include "device/generic_sensor/sensor_impl.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
+
+namespace device {
+
+namespace {
+
+void RunCallback(mojom::SensorInitParamsPtr init_params,
+                 mojom::SensorClientRequest client,
+                 const SensorProviderImpl::GetSensorCallback& callback) {
+  callback.Run(std::move(init_params), std::move(client));
+}
+
+void NotifySensorCreated(
+    mojom::SensorInitParamsPtr init_params,
+    mojom::SensorClientRequest client,
+    const SensorProviderImpl::GetSensorCallback& callback) {
+  base::ThreadTaskRunnerHandle::Get()->PostTask(
+      FROM_HERE, base::Bind(RunCallback, base::Passed(&init_params),
+                            base::Passed(&client), callback));
+}
+
+}  // namespace
+
+// static
+void SensorProviderImpl::Create(
+    scoped_refptr<base::SingleThreadTaskRunner> file_task_runner,
+    mojom::SensorProviderRequest request) {
+  PlatformSensorProvider* provider = PlatformSensorProvider::GetInstance();
+  if (provider) {
+    provider->SetFileTaskRunner(file_task_runner);
+    mojo::MakeStrongBinding(base::WrapUnique(new SensorProviderImpl(provider)),
+                            std::move(request));
+  }
+}
+
+SensorProviderImpl::SensorProviderImpl(PlatformSensorProvider* provider)
+    : provider_(provider), weak_ptr_factory_(this) {
+  DCHECK(provider_);
+}
+
+SensorProviderImpl::~SensorProviderImpl() {}
+
+void SensorProviderImpl::GetSensor(mojom::SensorType type,
+                                   mojom::SensorRequest sensor_request,
+                                   const GetSensorCallback& callback) {
+  auto cloned_handle = provider_->CloneSharedBufferHandle();
+  if (!cloned_handle.is_valid()) {
+    NotifySensorCreated(nullptr, nullptr, callback);
+    return;
+  }
+
+  scoped_refptr<PlatformSensor> sensor = provider_->GetSensor(type);
+  if (!sensor) {
+    PlatformSensorProviderBase::CreateSensorCallback cb = base::Bind(
+        &SensorProviderImpl::SensorCreated, weak_ptr_factory_.GetWeakPtr(),
+        type, base::Passed(&cloned_handle), base::Passed(&sensor_request),
+        callback);
+    provider_->CreateSensor(type, cb);
+    return;
+  }
+
+  SensorCreated(type, std::move(cloned_handle), std::move(sensor_request),
+                callback, std::move(sensor));
+}
+
+void SensorProviderImpl::SensorCreated(
+    mojom::SensorType type,
+    mojo::ScopedSharedBufferHandle cloned_handle,
+    mojom::SensorRequest sensor_request,
+    const GetSensorCallback& callback,
+    scoped_refptr<PlatformSensor> sensor) {
+  if (!sensor) {
+    NotifySensorCreated(nullptr, nullptr, callback);
+    return;
+  }
+
+  auto sensor_impl = base::MakeUnique<SensorImpl>(sensor);
+
+  auto init_params = mojom::SensorInitParams::New();
+  init_params->memory = std::move(cloned_handle);
+  init_params->buffer_offset = SensorReadingSharedBuffer::GetOffset(type);
+  init_params->mode = sensor->GetReportingMode();
+  init_params->default_configuration = sensor->GetDefaultConfiguration();
+
+  double maximum_frequency = sensor->GetMaximumSupportedFrequency();
+  DCHECK_GT(maximum_frequency, 0.0);
+  if (maximum_frequency > mojom::SensorConfiguration::kMaxAllowedFrequency)
+    maximum_frequency = mojom::SensorConfiguration::kMaxAllowedFrequency;
+
+  init_params->maximum_frequency = maximum_frequency;
+  init_params->minimum_frequency = sensor->GetMinimumSupportedFrequency();
+  DCHECK_GT(init_params->minimum_frequency, 0.0);
+
+  NotifySensorCreated(std::move(init_params), sensor_impl->GetClient(),
+                      callback);
+
+  mojo::MakeStrongBinding(std::move(sensor_impl), std::move(sensor_request));
+}
+
+}  // namespace device