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

device/generic_sensor/platform_sensor_provider.cc

Index: device/generic_sensor/platform_sensor_provider.cc
diff --git a/device/generic_sensor/platform_sensor_provider.cc b/device/generic_sensor/platform_sensor_provider.cc
index ad53757f99af852a4259853c6ebba1c6b667b83e..d0b72db0dc09899bb114cd84bb6a6f136924020b 100644
--- a/device/generic_sensor/platform_sensor_provider.cc
+++ b/device/generic_sensor/platform_sensor_provider.cc
@@ -8,6 +8,8 @@
 #include "device/generic_sensor/platform_sensor_provider_mac.h"
 #elif defined(OS_ANDROID)
 #include "device/generic_sensor/platform_sensor_provider_android.h"
+#elif defined(OS_LINUX)
+#include "device/generic_sensor/platform_sensor_provider_iio.h"
 #endif
 
 namespace {
@@ -32,6 +34,8 @@ PlatformSensorProvider* PlatformSensorProvider::GetInstance() {
   return PlatformSensorProviderMac::GetInstance();
 #elif defined(OS_ANDROID)
   return PlatformSensorProviderAndroid::GetInstance();
+#elif defined(OS_LINUX)
+  return PlatformSensorProviderIio::GetInstance();
 #else
   return nullptr;
 #endif