Add mock config to tools and run through gms and benchs without crashing.

Change-Id: I7e2474129ef2b15899ad2baeb8d18f39d05da98c
Reviewed-on: https://skia-review.googlesource.com/21820
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
diff --git a/bench/GrMipMapBench.cpp b/bench/GrMipMapBench.cpp
index 89100e3..e151fe5 100644
--- a/bench/GrMipMapBench.cpp
+++ b/bench/GrMipMapBench.cpp
@@ -37,8 +37,8 @@
                 return;
             }
             auto srgb = SkColorSpace::MakeSRGB();
-            SkImageInfo info = SkImageInfo::Make(fW, fH, kN32_SkColorType, kPremul_SkAlphaType,
-                                                 srgb);
+            SkImageInfo info =
+                    SkImageInfo::Make(fW, fH, kRGBA_8888_SkColorType, kPremul_SkAlphaType, srgb);
             fSurface = SkSurface::MakeRenderTarget(context, SkBudgeted::kNo, info);
         }