Fix a crash when grContext was deleted

Fix a crash when trimMemory has occurred and then a java
VectorDrawable object is deleted.

Test: Ran Camera app
Bug: 72837472
Change-Id: I4bdc5975a9ceccc09af17edd9905345f97c2660f
diff --git a/libs/hwui/renderthread/RenderProxy.cpp b/libs/hwui/renderthread/RenderProxy.cpp
index 4be7a57..c6a9b55f 100644
--- a/libs/hwui/renderthread/RenderProxy.cpp
+++ b/libs/hwui/renderthread/RenderProxy.cpp
@@ -356,14 +356,21 @@
 void RenderProxy::repackVectorDrawableAtlas() {
     RenderThread& thread = RenderThread::getInstance();
     thread.queue().post([&thread]() {
-        thread.cacheManager().acquireVectorDrawableAtlas()->repackIfNeeded(thread.getGrContext());
+        // The context may be null if trimMemory executed, but then the atlas was deleted too.
+        if (thread.getGrContext() != nullptr) {
+            thread.cacheManager().acquireVectorDrawableAtlas()->repackIfNeeded(
+                    thread.getGrContext());
+        }
     });
 }
 
 void RenderProxy::releaseVDAtlasEntries() {
     RenderThread& thread = RenderThread::getInstance();
     thread.queue().post([&thread]() {
-        thread.cacheManager().acquireVectorDrawableAtlas()->delayedReleaseEntries();
+        // The context may be null if trimMemory executed, but then the atlas was deleted too.
+        if (thread.getGrContext() != nullptr) {
+            thread.cacheManager().acquireVectorDrawableAtlas()->delayedReleaseEntries();
+        }
     });
 }