Add an API to get the name of the HAL client

Bug: 315039707
Test: manual test by
      1) run VTS context hub test and pass on pixel;
      2) call the API in HAL and verify the string name returned.

Change-Id: I6a42482ea5232b8664849821ba4ef63c49484086

contexthub/aidl/aidl_api/android.hardware.contexthub/current/android/hardware/contexthub/IContextHubCallback.aidl

@@ -40,5 +40,6 @@ interface IContextHubCallback {
   void handleTransactionResult(in int transactionId, in boolean success);
   void handleNanSessionRequest(in android.hardware.contexthub.NanSessionRequest request);
   byte[16] getUuid();
+  String getName();
   const int CONTEXTHUB_NAN_TRANSACTION_TIMEOUT_MS = 10000;
 }

contexthub/aidl/android/hardware/contexthub/IContextHubCallback.aidl

@@ -92,12 +92,20 @@ interface IContextHubCallback {
 
     /**
      * This callback is passed to the HAL implementation to allow the HAL to request a UUID that
-     * uniquely identifies an IContextHubCallback.
+     * uniquely identifies a client.
      *
      * @return a byte array representating the UUID
      */
     byte[16] getUuid();
 
+    /**
+     * This callback gets the name of a client implementing this IContextHubCallback interface,
+     * which must be a hard-coded string and does not change at runtime.
+     *
+     * <p>The name provides a human-readable way to identify a client for troubleshooting purpose.
+     */
+    String getName();
+
     /**
      * Amount of time, in milliseconds, that a handleNanSessionRequest can be pending before the
      * Contexthub service must respond.

contexthub/aidl/vts/VtsAidlHalContextHubTargetTest.cpp

@@ -49,8 +49,9 @@ using ::android::hardware::contexthub::vts_utils::kNonExistentAppId;
 using ::android::hardware::contexthub::vts_utils::waitForCallback;
 
 // 6612b522-b717-41c8-b48d-c0b1cc64e142
-const std::array<uint8_t, 16> kUuid = {0x66, 0x12, 0xb5, 0x22, 0xb7, 0x17, 0x41, 0xc8,
-                                       0xb4, 0x8d, 0xc0, 0xb1, 0xcc, 0x64, 0xe1, 0x42};
+constexpr std::array<uint8_t, 16> kUuid = {0x66, 0x12, 0xb5, 0x22, 0xb7, 0x17, 0x41, 0xc8,
+                                           0xb4, 0x8d, 0xc0, 0xb1, 0xcc, 0x64, 0xe1, 0x42};
+const String16 kName{"VtsAidlHalContextHubTargetTest"};
 
 class ContextHubAidl : public testing::TestWithParam<std::tuple<std::string, int32_t>> {
   public:
@@ -135,6 +136,11 @@ class EmptyContextHubCallback : public android::hardware::contexthub::BnContextH
         *out_uuid = kUuid;
         return Status::ok();
     }
+
+    Status getName(::android::String16* out_name) override {
+        *out_name = kName;
+        return Status::ok();
+    }
 };
 
 TEST_P(ContextHubAidl, TestRegisterCallback) {
@@ -171,6 +177,11 @@ class QueryAppsCallback : public android::hardware::contexthub::BnContextHubCall
         return Status::ok();
     }
 
+    Status getName(::android::String16* out_name) override {
+        *out_name = kName;
+        return Status::ok();
+    }
+
     std::promise<std::vector<NanoappInfo>> promise;
 };
 
@@ -242,6 +253,11 @@ class TransactionResultCallback : public android::hardware::contexthub::BnContex
         return Status::ok();
     }
 
+    Status getName(::android::String16* out_name) override {
+        *out_name = kName;
+        return Status::ok();
+    }
+
     uint32_t expectedTransactionId = 0;
     std::promise<bool> promise;
 };