Handle single pixel case on repeat bilerp.

src/core/SkLinearBitmapPipeline.cpp

Index: src/core/SkLinearBitmapPipeline.cpp
diff --git a/src/core/SkLinearBitmapPipeline.cpp b/src/core/SkLinearBitmapPipeline.cpp
index 7cdeaac5ffa4babfdbb71b27da536b08ca069670..0359e1fbb1c7d57c4570b5f7b43a2888a0ac9cb6 100644
--- a/src/core/SkLinearBitmapPipeline.cpp
+++ b/src/core/SkLinearBitmapPipeline.cpp
@@ -367,7 +367,9 @@ private:
         }
     }
     void breakIntoEdges(Span span) {
-        if (span.length() == 0) {
+        if (span.count() == 1) {
+            this->bilerpPoint(span.startX(), span.startY());
+        } else if (span.length() == 0) {
             yProcessSpan(span);
         } else {
             SkScalar dx = span.length() / (span.count() - 1);