Add stencil buffer create tracking to GPU stats.

src/gpu/GrTest.cpp

Index: src/gpu/GrTest.cpp
diff --git a/src/gpu/GrTest.cpp b/src/gpu/GrTest.cpp
index 9ddc97d8341828a60df322e14f6942702800ddeb..d5fb532d1c77827265bdc95cec4ee8de405a2883 100644
--- a/src/gpu/GrTest.cpp
+++ b/src/gpu/GrTest.cpp
@@ -72,6 +72,7 @@ void GrGpu::Stats::dump(SkString* out) {
     out->appendf("Shader Compilations: %d\n", fShaderCompilations);
     out->appendf("Textures Created: %d\n", fTextureCreates);
     out->appendf("Texture Uploads: %d\n", fTextureUploads);
+    out->appendf("Stencil Buffer Creates: %d\n", fStencilBufferCreates);
 }
 #endif