DM: failure to canary a sink is now fatal.

dm/DM.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "CrashHandler.h"
 #include "DMJsonWriter.h"
 #include "DMSrcSink.h"
@@ skipping 282 matching lines @@
         Error draw(SkCanvas*) const override { return ""; }
         SkISize size() const override { return SkISize::Make(16, 16); }
         Name name() const override { return "noop"; }
     } noop;
 
     SkBitmap bitmap;
     SkDynamicMemoryWStream stream;
     SkString log;
     Error err = sink->draw(noop, &bitmap, &stream, &log);
     if (err.isFatal()) {
-        SkDebugf("Skipping %s: %s\n", tag, err.c_str());
-        return;
+        SkDebugf("Could not run %s: %s\n", tag, err.c_str());
+        exit(1);
     }
 
     Tagged<Sink>& ts = gSinks.push_back();
     ts.reset(sink.detach());
     ts.tag = tag;
 }
 
 static bool gpu_supported() {
 #if SK_SUPPORT_GPU
     return FLAGS_gpu;
@@ skipping 429 matching lines @@
     }
     return 0;
 }
 
 #if !defined(SK_BUILD_FOR_IOS)
 int main(int argc, char** argv) {
     SkCommandLineFlags::Parse(argc, argv);
     return dm_main();
 }
 #endif