Add test cases for Clamp and Repeat tiles.

src/core/SkLinearBitmapPipeline_tile.h

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkLinearBitmapPipeline_tile_DEFINED
 #define SkLinearBitmapPipeline_tile_DEFINED
 
@@ skipping 82 matching lines @@
             Span middle = span.breakAt(xMax, dx);
             if (!middle.isEmpty()) {
                 next->pointSpan(middle);
             }
             if (!span.isEmpty()) {
                 span.clampToSinglePixel({xMax - 1, y});
                 next->pointSpan(span);
             }
         } else {
             Span rightClamped = span.breakAt(xMax, dx);
+
             if (!rightClamped.isEmpty()) {
                 rightClamped.clampToSinglePixel({xMax - 1, y});
                 next->pointSpan(rightClamped);
             }
             Span middle = span.breakAt(xMin, dx);
             if (!middle.isEmpty()) {
                 next->pointSpan(middle);
             }
             if (!span.isEmpty()) {
                 span.clampToSinglePixel({xMin, y});
@@ skipping 78 matching lines @@
         //
         // Overall Strategy:
         // While the span hangs over the edge of the tile, draw the span covering the tile then
         // slide the span over to the next tile.
 
         // The guard could have been count > 0, but then a bunch of math would be done in the
         // common case.
 
         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);
             }
         } else {
             while (!span.isEmpty() && span.endX() < xMin) {
                 Span toDraw = span.breakAt(xMin, dx);
                 next->pointSpan(toDraw);
                 span.offset(xMax);
             }
@@ skipping 17 matching lines @@
         return x - std::floor(x / base) * base;
     }
     const Sk4s fXMax{0.0f};
     const Sk4s fXInvMax{0.0f};
     const Sk4s fYMax{0.0f};
     const Sk4s fYInvMax{0.0f};
 };
 
 }  // namespace
 #endif  // SkLinearBitmapPipeline_tile_DEFINED