Fail to make render target context if GrContext is abandoned

Change-Id: I69eabbc0a8cd02ddd7292f81dd24e6b949bf38e5
Reviewed-on: https://skia-review.googlesource.com/23041
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>

src/gpu/GrContext.cpp

@@ -784,6 +784,10 @@ sk_sp<GrRenderTargetContext> GrContext::makeDeferredRenderTargetContext(
                                                         SkBudgeted budgeted) {
     SkASSERT(kDefault_GrSurfaceOrigin != origin);
 
+    if (this->abandoned()) {
+        return nullptr;
+    }
+
     GrSurfaceDesc desc;
     desc.fFlags = kRenderTarget_GrSurfaceFlag;
     desc.fOrigin = origin;