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/CanvasContext.cpp b/libs/hwui/renderthread/CanvasContext.cpp
index 16b35ff..504dfaa 100644
--- a/libs/hwui/renderthread/CanvasContext.cpp
+++ b/libs/hwui/renderthread/CanvasContext.cpp
@@ -193,6 +193,7 @@
 void CanvasContext::setSurface(ANativeWindow* window, bool enableTimeout) {
     ATRACE_CALL();
 
+    startHintSession();
     if (window) {
         mNativeSurface = std::make_unique<ReliableSurface>(window);
         mNativeSurface->init();