Add GM configs that test rendering to a GL backend texture and render target

This also adds GrGpu::create/deleteTestingOnlyBackendRenderTarget. Implemented in GL only for now.

Change-Id: I9e5fdc953c4a249959af89e08332f520cefe9d90
Reviewed-on: https://skia-review.googlesource.com/113305
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/bench/nanobench.cpp b/bench/nanobench.cpp
index 2246fbb07d..ea0de3398e 100644
--- a/bench/nanobench.cpp
+++ b/bench/nanobench.cpp
@@ -424,6 +424,10 @@ static void create_config(const SkCommandLineConfig* config, SkTArray<Config>* c
         const auto sampleCount = gpuConfig->getSamples();
         const auto colorType = gpuConfig->getColorType();
         auto colorSpace = gpuConfig->getColorSpace();
+        if (gpuConfig->getSurfType() != SkCommandLineConfigGpu::SurfType::kDefault) {
+            SkDebugf("This tool only supports the default surface type.");
+            return;
+        }
 
         GrContextFactory factory(grContextOpts);
         if (const GrContext* ctx = factory.get(ctxType, ctxOverrides)) {