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

device/generic_sensor/platform_sensor_provider_android.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/platform_sensor_provider_android.h"
+
+#include "base/android/scoped_java_ref.h"
+#include "base/memory/singleton.h"
+#include "device/generic_sensor/platform_sensor_android.h"
+#include "jni/PlatformSensorProvider_jni.h"
+
+using base::android::AttachCurrentThread;
+using base::android::ScopedJavaLocalRef;
+
+namespace device {
+
+// static
+PlatformSensorProviderAndroid* PlatformSensorProviderAndroid::GetInstance() {
+  return base::Singleton<
+      PlatformSensorProviderAndroid,
+      base::LeakySingletonTraits<PlatformSensorProviderAndroid>>::get();
+}
+
+PlatformSensorProviderAndroid::PlatformSensorProviderAndroid() {
+  JNIEnv* env = AttachCurrentThread();
+  j_object_.Reset(Java_PlatformSensorProvider_create(env));
+}
+
+PlatformSensorProviderAndroid::~PlatformSensorProviderAndroid() = default;
+
+void PlatformSensorProviderAndroid::CreateSensorInternal(
+    mojom::SensorType type,
+    mojo::ScopedSharedBufferMapping mapping,
+    const CreateSensorCallback& callback) {
+  JNIEnv* env = AttachCurrentThread();
+  ScopedJavaLocalRef<jobject> sensor = Java_PlatformSensorProvider_createSensor(
+      env, j_object_.obj(), static_cast<jint>(type));
+
+  if (!sensor.obj())
+    callback.Run(nullptr);
+
+  scoped_refptr<PlatformSensorAndroid> concrete_sensor =
+      new PlatformSensorAndroid(type, std::move(mapping), this, sensor);
+  callback.Run(concrete_sensor);
+}
+
+}  // namespace device