add context override of GeometryBufferMapThreshold

BUG=skia:

Review URL: https://codereview.chromium.org/1159713006

1 files changed, 1 insertions, 0 deletions

diff --git a/src/gpu/GrBufferAllocPool.h b/src/gpu/GrBufferAllocPool.h
index df0a0ccd9c..cd5d1971da 100644
--- a/src/gpu/GrBufferAllocPool.h
+++ b/src/gpu/GrBufferAllocPool.h
@@ -128,6 +128,7 @@ private:
     int                             fPreallocBufferStartIdx;
     SkAutoMalloc                    fCpuData;
     void*                           fBufferPtr;
+    size_t                          fGeometryBufferMapThreshold;
 };
 
 class GrVertexBuffer;