Fix GrAtlasTextBlob bounds management

src/gpu/text/GrAtlasTextBlob.cpp

Index: src/gpu/text/GrAtlasTextBlob.cpp
diff --git a/src/gpu/text/GrAtlasTextBlob.cpp b/src/gpu/text/GrAtlasTextBlob.cpp
index 05fb5ad415ff16b48633cfd9bdbc51839916d754..10fc308ea54a2df86d747a0fd4e8eb25d6a42694 100644
--- a/src/gpu/text/GrAtlasTextBlob.cpp
+++ b/src/gpu/text/GrAtlasTextBlob.cpp
@@ -63,7 +63,7 @@ void GrAtlasTextBlob::appendGlyph(int runIndex,
 
     subRun->setMaskFormat(format);
 
-    run.fVertexBounds.joinNonEmptyArg(positions);
+    subRun->joinGlyphBounds(positions);
     subRun->setColor(color);
 
     intptr_t vertex = reinterpret_cast<intptr_t>(this->fVertices + subRun->vertexEndIndex());
@@ -219,7 +219,6 @@ bool GrAtlasTextBlob::mustRegenerate(SkScalar* outTransX, SkScalar* outTransY,
         (*outTransY) = y - fY;
     }
 
-
     // If we can reuse the blob, then make sure we update the blob's viewmatrix, and x/y
     // offsets.  Note, we offset the vertex bounds right before flushing
     fViewMatrix = viewMatrix;
@@ -383,7 +382,6 @@ void GrAtlasTextBlob::flushCached(GrContext* context,
                                   drawFilter, viewMatrix, clipBounds, x, y);
             continue;
         }
-        fRuns[run].fVertexBounds.offset(transX, transY);
         this->flushRun(dc, &pipelineBuilder, run, color,
                        transX, transY, skPaint, props,
                        distanceAdjustTable, context->getBatchFontCache());