Add stencil buffer create tracking to GPU stats.

src/gpu/gl/GrGLGpu.cpp

Index: src/gpu/gl/GrGLGpu.cpp
diff --git a/src/gpu/gl/GrGLGpu.cpp b/src/gpu/gl/GrGLGpu.cpp
index 8710931301eae53fc39b2d930ece9f04301d7e5a..d54b60f7d60ea6b77f309d4dbbe92ec208cc7e6c 100644
--- a/src/gpu/gl/GrGLGpu.cpp
+++ b/src/gpu/gl/GrGLGpu.cpp
@@ -1167,7 +1167,7 @@ bool GrGLGpu::createStencilBufferForRenderTarget(GrRenderTarget* rt, int width,
             created = (GR_GL_NO_ERROR == check_alloc_error(rt->desc(), this->glInterface()));
         }
         if (created) {
-
+            fStats.incStencilBufferCreates();
             // After sized formats we attempt an unsized format and take
             // whatever sizes GL gives us. In that case we query for the size.
             GrGLStencilBuffer::Format format = sFmt;