Catch more shaders in cache warming

Bug: b/178661709

Test: Confirm with perfetto no unwanted shader compiles during
certain render engine actions

Change-Id: Ib5a523bcdcf8eded74f7ec4ecca526bdceff5039
diff --git a/libs/renderengine/skia/SkiaRenderEngine.h b/libs/renderengine/skia/SkiaRenderEngine.h
index 59d7e2f..51ef088 100644
--- a/libs/renderengine/skia/SkiaRenderEngine.h
+++ b/libs/renderengine/skia/SkiaRenderEngine.h
@@ -59,6 +59,7 @@
     virtual bool cleanupPostRender(CleanupMode) override { return true; };
     virtual int getContextPriority() override { return 0; }
     virtual void assertShadersCompiled(int numShaders) {}
+    virtual int reportShadersCompiled() { return 0; }
 };
 
 } // namespace skia