Add stringType and requiredPermission to sensors, effectively adding permission checking for sensors

This reverts commit 4369a4ebd5ae7567e7075bc82830b83178099ed5.

Change-Id: Ifa8619cc6873470a07a987763d818d78d4232610
diff --git a/include/gui/Sensor.h b/include/gui/Sensor.h
index 0c81426..033b262 100644
--- a/include/gui/Sensor.h
+++ b/include/gui/Sensor.h
@@ -69,6 +69,8 @@
     int32_t getVersion() const;
     int32_t getFifoReservedEventCount() const;
     int32_t getFifoMaxEventCount() const;
+    const String8& getStringType() const;
+    const String8& getRequiredPermission() const;
 
     // LightFlattenable protocol
     inline bool isFixedSize() const { return false; }
@@ -89,6 +91,10 @@
     int32_t mVersion;
     int32_t mFifoReservedEventCount;
     int32_t mFifoMaxEventCount;
+    String8 mStringType;
+    String8 mRequiredPermission;
+    static void flattenString8(void*& buffer, size_t& size, const String8& string8);
+    static bool unflattenString8(void const*& buffer, size_t& size, String8& outputString8);
 };
 
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