Add stretch plumbing

Bug: 179047472
Test: builds & boots

Change-Id: I30b5d6683160af598f98555f61af1cf5a7639bbe
diff --git a/libs/hwui/Android.bp b/libs/hwui/Android.bp
index 615bf4d..ce1d96c 100644
--- a/libs/hwui/Android.bp
+++ b/libs/hwui/Android.bp
@@ -435,6 +435,7 @@
         "canvas/CanvasFrontend.cpp",
         "canvas/CanvasOpBuffer.cpp",
         "canvas/CanvasOpRasterizer.cpp",
+        "effects/StretchEffect.cpp",
         "pipeline/skia/SkiaDisplayList.cpp",
         "pipeline/skia/SkiaRecordingCanvas.cpp",
         "pipeline/skia/RenderNodeDrawable.cpp",