Add texture create/upload stats and make nanobench have explicit gpu stats flag

src/gpu/GrTest.cpp

Index: src/gpu/GrTest.cpp
diff --git a/src/gpu/GrTest.cpp b/src/gpu/GrTest.cpp
index 168907030844b383bf2a682996bac29b046df713..05a4a5f956963175558cd20b90891d54395a911d 100644
--- a/src/gpu/GrTest.cpp
+++ b/src/gpu/GrTest.cpp
@@ -69,6 +69,8 @@ void GrContext::printGpuStats() const {
 void GrGpu::Stats::dump(SkString* out) {
     out->appendf("Render Target Binds: %d\n", fRenderTargetBinds);
     out->appendf("Shader Compilations: %d\n", fShaderCompilations);
+    out->appendf("Textures Created: %d\n", fTextureCreates);
+    out->appendf("Texture Uploads: %d\n", fTextureUploads);
 }
 #endif