Add SkRasterPipeline blitter.

src/core/SkBlitter.cpp

Index: src/core/SkBlitter.cpp
diff --git a/src/core/SkBlitter.cpp b/src/core/SkBlitter.cpp
index f5d13dc5f1e08006b33b40a422ef221be4bcfc3c..db9fcda93b19fc3b364859b0727de89e3b55888e 100644
--- a/src/core/SkBlitter.cpp
+++ b/src/core/SkBlitter.cpp
@@ -853,6 +853,10 @@ SkBlitter* SkBlitter::Choose(const SkPixmap& device,
         p->setColor(0);
     }
 
+    if (SkBlitter* blitter = SkCreateRasterPipelineBlitter(device, *paint, allocator)) {
+        return blitter;
+    }
+
     if (nullptr == shader) {
         if (mode) {
             // xfermodes (and filters) require shaders for our current blitters