Update skia flush call APIs.

Test: manual
Change-Id: I72fa57b04f1b4ea594063ddb4ce6af9507b1fcdb
diff --git a/libs/hwui/tests/unit/CacheManagerTests.cpp b/libs/hwui/tests/unit/CacheManagerTests.cpp
index c83a3c8..a4d7b82 100644
--- a/libs/hwui/tests/unit/CacheManagerTests.cpp
+++ b/libs/hwui/tests/unit/CacheManagerTests.cpp
@@ -47,7 +47,7 @@
         sk_sp<SkSurface> surface = SkSurface::MakeRenderTarget(grContext, SkBudgeted::kYes, info);
         surface->getCanvas()->drawColor(SK_AlphaTRANSPARENT);
 
-        grContext->flush();
+        grContext->flushAndSubmit();
 
         surfaces.push_back(surface);
     }