hwui's own impl for interpolator

Bug: 184822190
Test: make
Change-Id: Ib041ad8207417ea5dfa09b50412234e5cf7daf80
diff --git a/libs/hwui/Android.bp b/libs/hwui/Android.bp
index c75b21f..9270901 100644
--- a/libs/hwui/Android.bp
+++ b/libs/hwui/Android.bp
@@ -503,6 +503,7 @@
         "RenderProperties.cpp",
         "RootRenderNode.cpp",
         "SkiaCanvas.cpp",
+        "SkiaInterpolator.cpp",
         "VectorDrawable.cpp",
     ],