Create a skeleton VisualDebugModule

tools/VisualBench/VisualBenchmarkStream.cpp

Index: tools/VisualBench/VisualBenchmarkStream.cpp
diff --git a/tools/VisualBench/VisualBenchmarkStream.cpp b/tools/VisualBench/VisualBenchmarkStream.cpp
index 183da75b50b45c03cb6d8710027730577dbd0a90..c4da7b51dc1b2f4a49fb5fcc000b0f6e7cfe58c0 100644
--- a/tools/VisualBench/VisualBenchmarkStream.cpp
+++ b/tools/VisualBench/VisualBenchmarkStream.cpp
@@ -72,7 +72,7 @@ private:
     SkRect fPerlinRect;
 };
 
-VisualBenchmarkStream::VisualBenchmarkStream(const SkSurfaceProps& surfaceProps)
+VisualBenchmarkStream::VisualBenchmarkStream(const SkSurfaceProps& surfaceProps, bool justSKP)
     : fSurfaceProps(surfaceProps)
     , fBenches(BenchRegistry::Head())
     , fGMs(skiagm::GMRegistry::Head())
@@ -92,6 +92,11 @@ VisualBenchmarkStream::VisualBenchmarkStream(const SkSurfaceProps& surfaceProps)
         }
     }
 
+    if (justSKP) {
+       fGMs = nullptr;
+       fBenches = nullptr;
+    }
+
     // seed with an initial benchmark
     // NOTE the initial benchmark will not have preTimingHooks called, but that is okay because
     // it is the warmupbench