[sensors](CrOS/Linux) Implement Sensor device manager for sensors

device/generic_sensor/platform_sensor_provider_base.cc

Index: device/generic_sensor/platform_sensor_provider_base.cc
diff --git a/device/generic_sensor/platform_sensor_provider_base.cc b/device/generic_sensor/platform_sensor_provider_base.cc
index c3f30ceb648966f50954ee5717d6e42ac4686551..eac4ae721e5643a96c35d56a27df783189c2853f 100644
--- a/device/generic_sensor/platform_sensor_provider_base.cc
+++ b/device/generic_sensor/platform_sensor_provider_base.cc
@@ -32,8 +32,7 @@ void PlatformSensorProviderBase::CreateSensor(
     return;
   }
 
-  mojo::ScopedSharedBufferMapping mapping = shared_buffer_handle_->MapAtOffset(
-      kReadingBufferSize, SensorReadingSharedBuffer::GetOffset(type));
+  mojo::ScopedSharedBufferMapping mapping = GetScopedSharedBufferMapping(type);
   if (!mapping) {
     callback.Run(nullptr);
     return;
@@ -78,6 +77,7 @@ void PlatformSensorProviderBase::RemoveSensor(mojom::SensorType type) {
   DCHECK(CalledOnValidThread());
   DCHECK(ContainsKey(sensor_map_, type));
   sensor_map_.erase(type);
+  SensorRemoved(type);
 
   if (sensor_map_.empty()) {
     AllSensorsRemoved();
@@ -117,4 +117,20 @@ void PlatformSensorProviderBase::NotifySensorCreated(
   requests_map_.erase(type);
 }
 
+std::vector<mojom::SensorType>
+PlatformSensorProviderBase::GetPendingRequestTypes() {
+  std::vector<mojom::SensorType> request_types;
+  for (auto const& entry : requests_map_)
+    request_types.push_back(entry.first);
+  return request_types;
+}
+
+mojo::ScopedSharedBufferMapping
+PlatformSensorProviderBase::GetScopedSharedBufferMapping(

[Mikhail, 2016/12/09 08:15:56]

pls rename it to 'MapSharedBufferForType()'

[maksims (do not use this acc), 2016/12/09 10:22:42]

Done.

+    mojom::SensorType type) {
+  mojo::ScopedSharedBufferMapping mapping = shared_buffer_handle_->MapAtOffset(
+      kReadingBufferSize, SensorReadingSharedBuffer::GetOffset(type));

[Mikhail, 2016/12/09 08:15:56]

memset(mapping.get(), 0, kReadingBufferSize);

[maksims (do not use this acc), 2016/12/09 10:22:42]

Done.

+  return mapping;
+}
+
 }  // namespace device