Add layer updates debugging feature to Skia pipelines

When this property is turned on, we flash green
every time a hardware layer is updated.

Test: Matches the behavior in OpenGLPipeline

BUG:32370375

Change-Id: I916f94eee644c185d8a3f9fa4cd69e087ed1e92d
diff --git a/libs/hwui/pipeline/skia/SkiaPipeline.cpp b/libs/hwui/pipeline/skia/SkiaPipeline.cpp
index a6612c9..a4a83ef 100644
--- a/libs/hwui/pipeline/skia/SkiaPipeline.cpp
+++ b/libs/hwui/pipeline/skia/SkiaPipeline.cpp
@@ -106,6 +106,7 @@
                 return;
             }
 
+            layerNode->getSkiaLayer()->hasRenderedSinceRepaint = false;
             layerCanvas->clear(SK_ColorTRANSPARENT);
 
             RenderNodeDrawable root(layerNode, layerCanvas, false);