Fix GrAtlasTextBlob bounds management

src/gpu/batches/GrAtlasTextBatch.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrAtlasTextBatch.h"
 
 #include "GrBatchFlushState.h"
@@ skipping 395 matching lines @@
                 // have a valid atlas generation
                 fFontCache->setUseTokenBulk(*info.bulkUseToken(), target->currentToken(),
                                             maskFormat);
                 break;
         }
 
         // now copy all vertices
         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;
     }
 
     // Make sure to attach the last cache if applicable
     if (cache) {
         SkGlyphCache::AttachCache(cache);
     }
     this->flush(target, &flushInfo);
 }
 
@@ skipping 121 matching lines @@
         return GrDistanceFieldA8TextGeoProc::Create(color,
                                                     viewMatrix,
                                                     texture,
                                                     params,
                                                     flags,
                                                     this->usesLocalCoords());
 #endif
     }
 
 }