Totally block trying to flush a ddl drawmgr

This should never be possible.

Bug: skia:10877
Change-Id: I476ece42182b2296da528a2b3a3a2587c5bfedea
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/332719
Auto-Submit: Adlai Holler <adlai@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
diff --git a/src/gpu/GrDrawingManager.cpp b/src/gpu/GrDrawingManager.cpp
index a55ea63..0c181c2 100644
--- a/src/gpu/GrDrawingManager.cpp
+++ b/src/gpu/GrDrawingManager.cpp
@@ -208,15 +208,7 @@
     }
 
     auto direct = fContext->asDirectContext();
-    if (!direct) {
-        if (info.fSubmittedProc) {
-            info.fSubmittedProc(info.fSubmittedContext, false);
-        }
-        if (info.fFinishedProc) {
-            info.fFinishedProc(info.fFinishedContext);
-        }
-        return false; // Can't flush while DDL recording
-    }
+    SkASSERT(direct);
     direct->priv().clientMappedBufferManager()->process();
 
     GrGpu* gpu = direct->priv().getGpu();
@@ -534,16 +526,7 @@
     SkASSERT(!numProxies || proxies);
 
     auto direct = fContext->asDirectContext();
-    if (!direct) {
-        if (info.fSubmittedProc) {
-            info.fSubmittedProc(info.fSubmittedContext, false);
-        }
-        if (info.fFinishedProc) {
-            info.fFinishedProc(info.fFinishedContext);
-        }
-        return GrSemaphoresSubmitted::kNo; // Can't flush while DDL recording
-    }
-
+    SkASSERT(direct);
     GrGpu* gpu = direct->priv().getGpu();
     // We have a non abandoned and direct GrContext. It must have a GrGpu.
     SkASSERT(gpu);