Update GrContext creation calls to use sk_sp

Test: manual testing

Change-Id: I68d8706ffa7bc7c6622ea0b8c45d7297a131f6bf
diff --git a/libs/hwui/renderthread/RenderThread.h b/libs/hwui/renderthread/RenderThread.h
index 970537b..3aa5487 100644
--- a/libs/hwui/renderthread/RenderThread.h
+++ b/libs/hwui/renderthread/RenderThread.h
@@ -88,7 +88,7 @@
     const DisplayInfo& mainDisplayInfo() { return mDisplayInfo; }
 
     GrContext* getGrContext() const { return mGrContext.get(); }
-    void setGrContext(GrContext* cxt);
+    void setGrContext(sk_sp<GrContext> cxt);
 
     CacheManager& cacheManager() { return *mCacheManager; }
     VulkanManager& vulkanManager() { return *mVkManager; }