Port background blurs to SkiaRE

Bug: 164223050
Test: manual
Test: atest LayerTypeAndRenderTypeTransactionTest
Change-Id: I459780d9fd408865d1d9713f37bf308f07c4fdfc
diff --git a/libs/renderengine/Android.bp b/libs/renderengine/Android.bp
index 1ccbff1..eb967ce 100644
--- a/libs/renderengine/Android.bp
+++ b/libs/renderengine/Android.bp
@@ -77,6 +77,7 @@
     srcs: [
         "skia/SkiaRenderEngine.cpp",
         "skia/SkiaGLRenderEngine.cpp",
+        "skia/filters/BlurFilter.cpp",
     ],
 }