Add test cases for Clamp and Repeat tiles.

src/core/SkLinearBitmapPipeline_tile.h

Index: src/core/SkLinearBitmapPipeline_tile.h
diff --git a/src/core/SkLinearBitmapPipeline_tile.h b/src/core/SkLinearBitmapPipeline_tile.h
index 2f855a36af4a704cdf8ab599d6f1e63eb7e841f3..761e3c57ebc7755ee3cdd584e08b3776f5100f82 100644
--- a/src/core/SkLinearBitmapPipeline_tile.h
+++ b/src/core/SkLinearBitmapPipeline_tile.h
@@ -100,6 +100,7 @@ public:
             }
         } else {
             Span rightClamped = span.breakAt(xMax, dx);
+
             if (!rightClamped.isEmpty()) {
                 rightClamped.clampToSinglePixel({xMax - 1, y});
                 next->pointSpan(rightClamped);
@@ -198,7 +199,7 @@ public:
 
         Span span({x, y}, length, count);
         if (dx > 0) {
-            while (!span.isEmpty() && span.endX() > xMax) {
+            while (!span.isEmpty() && span.endX() >= xMax) {
                 Span toDraw = span.breakAt(xMax, dx);
                 next->pointSpan(toDraw);
                 span.offset(-xMax);