Fix GrAtlasTextBlob bounds management

src/gpu/batches/GrAtlasTextBatch.cpp

Index: src/gpu/batches/GrAtlasTextBatch.cpp
diff --git a/src/gpu/batches/GrAtlasTextBatch.cpp b/src/gpu/batches/GrAtlasTextBatch.cpp
index ce6b2eae2b56d4db7eb86aab35b94f756cc34434..b2251a42a884b1be3f3c530ea27ab1926134386e 100644
--- a/src/gpu/batches/GrAtlasTextBatch.cpp
+++ b/src/gpu/batches/GrAtlasTextBatch.cpp
@@ -413,6 +413,19 @@ void GrAtlasTextBatch::onPrepareDraws(Target* target) const {
         size_t byteCount = info.byteCount();
         memcpy(currVertex, blob->fVertices + info.vertexStartIndex(), byteCount);
 
+#ifdef SK_DEBUG
+        // bounds sanity check
+        SkRect rect;
+        rect.setLargestInverted();
+        SkPoint* vertex = (SkPoint*) ((char*)blob->fVertices + info.vertexStartIndex());
+        rect.growToInclude(vertex, vertexStride, kVerticesPerGlyph * info.glyphCount());
+
+        if (this->usesDistanceFields()) {
+            fBatch.fViewMatrix.mapRect(&rect);
+        }
+        SkASSERT(fBounds.contains(rect));
+#endif
+
         currVertex += byteCount;
     }