Add bilerp filtering.

bench/SkLinearBitmapPipelineBench.cpp

Index: bench/SkLinearBitmapPipelineBench.cpp
diff --git a/bench/SkLinearBitmapPipelineBench.cpp b/bench/SkLinearBitmapPipelineBench.cpp
index ea00638c9366168644075ef0f173127fb28bb6c0..14a1001848bcc2b823f68d6786e4fc22ba7cc41e 100644
--- a/bench/SkLinearBitmapPipelineBench.cpp
+++ b/bench/SkLinearBitmapPipelineBench.cpp
@@ -134,7 +134,15 @@ struct SkBitmapFPGeneral final : public CommonBitmapFPBenchmark {
 
         SkPM4f* FPbuffer = new SkPM4f[width * height];
 
-        SkLinearBitmapPipeline pipeline{fInvert, fXTile, fYTile, fInfo, fBitmap.get(), };
+        SkFilterQuality filterQuality;
+        if (fUseBilerp) {
+            filterQuality = SkFilterQuality::kLow_SkFilterQuality;
+        } else {
+            filterQuality = SkFilterQuality::kNone_SkFilterQuality;
+        }
+
+        SkLinearBitmapPipeline pipeline{
+            fInvert, filterQuality, fXTile, fYTile, fInfo, fBitmap.get() };
 
         int count = 100;