Fix possible leaks in CanvasContext HintSessionWrapper

Ensure the mHintSessionFuture is accounted for correctly in the
destructor.

Bug: b/297230599
Test: manual
(cherry picked from commit ac620f64a32500890007b0b405ca72405d6db41e)
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:e4b73a7aa058be845d3ee2433b8da99fc524d7c1)
Merged-In: Idcbd0f2ba87290f090d693f0a64cb46fe8270b95
Change-Id: Idcbd0f2ba87290f090d693f0a64cb46fe8270b95
diff --git a/libs/hwui/renderthread/HintSessionWrapper.h b/libs/hwui/renderthread/HintSessionWrapper.h
index 24b8150..bdb9959 100644
--- a/libs/hwui/renderthread/HintSessionWrapper.h
+++ b/libs/hwui/renderthread/HintSessionWrapper.h
@@ -37,6 +37,7 @@
     void sendLoadResetHint();
     void sendLoadIncreaseHint();
     bool init();
+    void destroy();
 
 private:
     APerformanceHintSession* mHintSession = nullptr;