[sensors] Introduce Generic Sensor API interfaces

device/generic_sensor/platform_sensor_provider_default.cc

Index: device/generic_sensor/platform_sensor_provider_default.cc
diff --git a/device/gamepad/gamepad_consumer.cc b/device/generic_sensor/platform_sensor_provider_default.cc
similarity index 57%
copy from device/gamepad/gamepad_consumer.cc
copy to device/generic_sensor/platform_sensor_provider_default.cc
index d5771ad6d178dfc4712fa89f2a647c6326a60a47..fa0d536816f333e70539c4e16b553dc423a88634 100644
--- a/device/gamepad/gamepad_consumer.cc
+++ b/device/generic_sensor/platform_sensor_provider_default.cc
@@ -2,12 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "device/gamepad/gamepad_consumer.h"
+#include "device/generic_sensor/platform_sensor_provider.h"
 
 namespace device {
 
-GamepadConsumer::GamepadConsumer() {}
-
-GamepadConsumer::~GamepadConsumer() {}
+// static
+PlatformSensorProvider* PlatformSensorProvider::GetInstance() {
+  return nullptr;
+}
 
 }  // namespace device