When running DM, write test failures to json.

tests/skia_test.cpp

 /*
  * Copyright 2011 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 "OverwriteLine.h"
 #include "Resources.h"
@@ skipping 40 matching lines @@
 };
 
 class DebugfReporter : public Reporter {
 public:
     explicit DebugfReporter(int total) : fDone(0), fTotal(total) {}
 
     virtual bool allowExtendedTest() const SK_OVERRIDE { return FLAGS_extendedTest; }
     virtual bool verbose()           const SK_OVERRIDE { return FLAGS_veryVerbose; }
 
 protected:
-    virtual void onReportFailed(const SkString& desc) SK_OVERRIDE {
+    virtual void onReportFailed(const skiatest::Failure& failure) SK_OVERRIDE {
+        SkString desc;
+        failure.getFailureString(&desc);
         SkDebugf("\nFAILED: %s", desc.c_str());
     }
 
     virtual void onEnd(Test* test) SK_OVERRIDE {
         const int done = 1 + sk_atomic_inc(&fDone);
 
         if (!test->passed()) {
             SkDebugf("\n---- %s FAILED", test->getName());
         }
 
@@ skipping 144 matching lines @@
     SkDebugf("\n");
     return (failCount == 0) ? 0 : 1;
 }
 
 #if !defined(SK_BUILD_FOR_IOS) && !defined(SK_BUILD_FOR_NACL)
 int main(int argc, char** argv) {
     SkCommandLineFlags::Parse(argc, argv);
     return test_main();
 }
 #endif