Fix crash where trim memory resulted in HWUI deleting the surface.

When HWUI is given the TRIM_MEMORY_COMPLETE signal it deletes all
of the associated GPU resources. In doing so it also deleted the
GL/Vk handle to the the ANativeWindow. So if the app attempted to
recover and draw new content it would crash because we no longer
had a surface to reinitialize and render into.

Test: atest hwui_unit_tests
Bug: 233388563
Change-Id: I54f3f0dadc3dfc89d2b1f567d36611f6a966c4f0
diff --git a/libs/hwui/tests/unit/SkiaPipelineTests.cpp b/libs/hwui/tests/unit/SkiaPipelineTests.cpp
index 60ae604..7419f8f 100644
--- a/libs/hwui/tests/unit/SkiaPipelineTests.cpp
+++ b/libs/hwui/tests/unit/SkiaPipelineTests.cpp
@@ -404,7 +404,9 @@
     EXPECT_TRUE(pipeline->isSurfaceReady());
     renderThread.destroyRenderingContext();
     EXPECT_FALSE(pipeline->isSurfaceReady());
-    LOG_ALWAYS_FATAL_IF(pipeline->isSurfaceReady());
+
+    pipeline->makeCurrent();
+    EXPECT_TRUE(pipeline->isSurfaceReady());
 }
 
 RENDERTHREAD_SKIA_PIPELINE_TEST(SkiaPipeline, pictureCallback) {