Update setHdrConversionStrategy to return the preferredHdrOutput type

Bug: 268336382
Test: atest VtsHalGraphicsComposer3_TargetTest
Change-Id: I6ac912ac8a0329f4ea32acad657e44b473660c42
diff --git a/graphics/composer/aidl/vts/VtsHalGraphicsComposer3_TargetTest.cpp b/graphics/composer/aidl/vts/VtsHalGraphicsComposer3_TargetTest.cpp
index 55e0a13..70c4e4c 100644
--- a/graphics/composer/aidl/vts/VtsHalGraphicsComposer3_TargetTest.cpp
+++ b/graphics/composer/aidl/vts/VtsHalGraphicsComposer3_TargetTest.cpp
@@ -637,8 +637,10 @@
     }
     common::HdrConversionStrategy hdrConversionStrategy;
     hdrConversionStrategy.set<common::HdrConversionStrategy::Tag::passthrough>(true);
-    const auto& status = mComposerClient->setHdrConversionStrategy(hdrConversionStrategy);
+    const auto& [status, preferredHdrOutputType] =
+            mComposerClient->setHdrConversionStrategy(hdrConversionStrategy);
     EXPECT_TRUE(status.isOk());
+    EXPECT_EQ(common::Hdr::INVALID, preferredHdrOutputType);
 }
 
 TEST_P(GraphicsComposerAidlTest, SetHdrConversionStrategy_Force) {
@@ -652,9 +654,10 @@
             common::HdrConversionStrategy hdrConversionStrategy;
             hdrConversionStrategy.set<common::HdrConversionStrategy::Tag::forceHdrConversion>(
                     conversionCapability.outputType->hdr);
-            const auto& statusSet =
+            const auto& [statusSet, preferredHdrOutputType] =
                     mComposerClient->setHdrConversionStrategy(hdrConversionStrategy);
-            EXPECT_TRUE(status.isOk());
+            EXPECT_TRUE(statusSet.isOk());
+            EXPECT_EQ(common::Hdr::INVALID, preferredHdrOutputType);
         }
     }
 }
@@ -674,8 +677,10 @@
     common::HdrConversionStrategy hdrConversionStrategy;
     hdrConversionStrategy.set<common::HdrConversionStrategy::Tag::autoAllowedHdrTypes>(
             autoHdrTypes);
-    const auto& statusSet = mComposerClient->setHdrConversionStrategy(hdrConversionStrategy);
-    EXPECT_TRUE(status.isOk());
+    const auto& [statusSet, preferredHdrOutputType] =
+            mComposerClient->setHdrConversionStrategy(hdrConversionStrategy);
+    EXPECT_TRUE(statusSet.isOk());
+    EXPECT_NE(common::Hdr::INVALID, preferredHdrOutputType);
 }
 
 TEST_P(GraphicsComposerAidlTest, SetAutoLowLatencyMode_BadDisplay) {