Add stencil buffer create tracking to GPU stats.

src/gpu/GrClipMaskManager.h

Index: src/gpu/GrClipMaskManager.h
diff --git a/src/gpu/GrClipMaskManager.h b/src/gpu/GrClipMaskManager.h
index bc164da36e4c9abb9357cd77a1e80d5376775e1a..7fcfa50c4e3e6f17835ac5d08455ee0d2b23dfc8 100644
--- a/src/gpu/GrClipMaskManager.h
+++ b/src/gpu/GrClipMaskManager.h
@@ -166,9 +166,8 @@ private:
     void setupCache(const SkClipStack& clip,
                     const SkIRect& bounds);
     /**
-     * Called prior to return control back the GrGpu in setupClipping. It
-     * updates the GrGpu with stencil settings that account stencil-based
-     * clipping.
+     * Called prior to return control back the GrGpu in setupClipping. It updates the
+     * GrPipelineBuilder with stencil settings that account for stencil-based clipping.
      */
     void setPipelineBuilderStencil(GrPipelineBuilder*, GrPipelineBuilder::AutoRestoreStencil*);