Revert of [sensors] Ambient light sensor implementation for ChromeOS and Linux.

device/generic_sensor/platform_sensor_linux.cc

Index: device/generic_sensor/platform_sensor_linux.cc
diff --git a/device/generic_sensor/platform_sensor_linux.cc b/device/generic_sensor/platform_sensor_linux.cc
deleted file mode 100644
index 3495659729c1035f8a50687ce6fbebb4fc961615..0000000000000000000000000000000000000000
--- a/device/generic_sensor/platform_sensor_linux.cc
+++ /dev/null
@@ -1,114 +0,0 @@
-// 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_linux.h"
-
-#include "base/threading/thread.h"
-#include "base/timer/timer.h"
-#include "device/generic_sensor/linux/platform_sensor_utils_linux.h"
-#include "device/generic_sensor/linux/sensor_data_linux.h"
-
-namespace device {
-
-namespace {
-
-// Checks if at least one value has been changed.
-bool HaveValuesChanged(const SensorReading& lhs, const SensorReading& rhs) {
-  return lhs.values[0] != rhs.values[0] || lhs.values[1] != rhs.values[1] ||
-         lhs.values[2] != rhs.values[2];
-}
-
-}  // namespace
-
-PlatformSensorLinux::PlatformSensorLinux(
-    mojom::SensorType type,
-    mojo::ScopedSharedBufferMapping mapping,
-    PlatformSensorProvider* provider,
-    const SensorDataLinux& data,
-    std::unique_ptr<SensorReader> sensor_reader,
-    scoped_refptr<base::SingleThreadTaskRunner> polling_thread_task_runner_)
-    : PlatformSensor(type, std::move(mapping), provider),
-      timer_(new base::RepeatingTimer()),
-      default_configuration_(data.default_configuration),
-      reporting_mode_(data.reporting_mode),
-      sensor_reader_(std::move(sensor_reader)),
-      polling_thread_task_runner_(polling_thread_task_runner_),
-      weak_factory_(this) {}
-
-PlatformSensorLinux::~PlatformSensorLinux() {
-  polling_thread_task_runner_->DeleteSoon(FROM_HERE, timer_);
-}
-
-mojom::ReportingMode PlatformSensorLinux::GetReportingMode() {
-  return reporting_mode_;
-}
-
-bool PlatformSensorLinux::StartSensor(
-    const PlatformSensorConfiguration& configuration) {
-  DCHECK(task_runner_->BelongsToCurrentThread());
-  return polling_thread_task_runner_->PostTask(
-      FROM_HERE, base::Bind(&PlatformSensorLinux::BeginPoll,
-                            weak_factory_.GetWeakPtr(), configuration));
-}
-
-void PlatformSensorLinux::StopSensor() {
-  DCHECK(task_runner_->BelongsToCurrentThread());
-  polling_thread_task_runner_->PostTask(
-      FROM_HERE, base::Bind(&PlatformSensorLinux::StopPoll, this));
-}
-
-bool PlatformSensorLinux::CheckSensorConfiguration(
-    const PlatformSensorConfiguration& configuration) {
-  DCHECK(task_runner_->BelongsToCurrentThread());
-  // TODO(maksims): make this sensor dependent.
-  // For example, in case of accelerometer, check current polling frequency
-  // exposed by iio driver.
-  return configuration.frequency() > 0 &&
-         configuration.frequency() <=
-             mojom::SensorConfiguration::kMaxAllowedFrequency;
-}
-
-PlatformSensorConfiguration PlatformSensorLinux::GetDefaultConfiguration() {
-  DCHECK(task_runner_->BelongsToCurrentThread());
-  return default_configuration_;
-}
-
-void PlatformSensorLinux::BeginPoll(
-    const PlatformSensorConfiguration& configuration) {
-  DCHECK(polling_thread_task_runner_->BelongsToCurrentThread());
-  timer_->Start(FROM_HERE, base::TimeDelta::FromMicroseconds(
-                               base::Time::kMicrosecondsPerSecond /
-                               configuration.frequency()),
-                this, &PlatformSensorLinux::PollForReadingData);
-}
-
-void PlatformSensorLinux::StopPoll() {
-  DCHECK(polling_thread_task_runner_->BelongsToCurrentThread());
-  timer_->Stop();
-}
-
-void PlatformSensorLinux::PollForReadingData() {
-  DCHECK(polling_thread_task_runner_->BelongsToCurrentThread());
-
-  SensorReading reading;
-  if (!sensor_reader_->ReadSensorReading(&reading)) {
-    task_runner_->PostTask(
-        FROM_HERE, base::Bind(&PlatformSensorLinux::NotifySensorError, this));
-    StopPoll();
-    return;
-  }
-
-  bool notifyNeeded = false;
-  if (GetReportingMode() == mojom::ReportingMode::ON_CHANGE) {
-    if (!HaveValuesChanged(reading, old_values_))
-      return;
-    notifyNeeded = true;
-  }
-
-  old_values_ = reading;
-  reading.timestamp = (base::TimeTicks::Now() - base::TimeTicks()).InSecondsF();
-  UpdateSensorReading(reading, notifyNeeded);
-}
-
-}  // namespace device