Add a makeDrawContextWithFallback that handles config fallback

src/gpu/SkGpuDevice.cpp

Index: src/gpu/SkGpuDevice.cpp
diff --git a/src/gpu/SkGpuDevice.cpp b/src/gpu/SkGpuDevice.cpp
index a59f9d7b6ed846fccb4eb522535739eb6ddd7a06..64df998e2fa6b4a38cf3489da0d3c48f2a7b151d 100644
--- a/src/gpu/SkGpuDevice.cpp
+++ b/src/gpu/SkGpuDevice.cpp
@@ -172,9 +172,6 @@ sk_sp<GrDrawContext> SkGpuDevice::MakeDrawContext(GrContext* context,
     }
 
     GrPixelConfig config = SkImageInfo2GrPixelConfig(ct, at, cs, *context->caps());
-    if (!context->caps()->isConfigRenderable(config, sampleCount > 0)) {
-        return nullptr;
-    }
 
     return context->makeDrawContext(SkBackingFit::kExact,               // Why exact?
                                     origInfo.width(), origInfo.height(),