gm: add self-test to confirm that ignore-failure field is respected

gm/gmmain.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.
  */
 
 /*
  * Code for the "gm" (Golden Master) rendering comparison tool.
  *
@@ skipping 803 matching lines @@
      */
     void add_actual_results_to_json_summary(const char testName[],
                                             const GmResultDigest &actualResultDigest,
                                             ErrorCombination errors,
                                             bool ignoreFailure) {
         Json::Value jsonActualResults = actualResultDigest.asJsonTypeValuePair();
         if (errors.isEmpty()) {
             this->fJsonActualResults_Succeeded[testName] = jsonActualResults;
         } else {
             if (ignoreFailure) {
-                // TODO: Once we have added the ability to compare
-                // actual results against expectations in a JSON file
-                // (where we can set ignore-failure to either true or
-                // false), add test cases that exercise ignored
-                // failures (both for kMissingExpectations_ErrorType
-                // and kExpectationsMismatch_ErrorType).
                 this->fJsonActualResults_FailureIgnored[testName] =
                     jsonActualResults;
             } else {
                 if (errors.includes(kMissingExpectations_ErrorType)) {
                     // TODO: What about the case where there IS an
                     // expected image hash digest, but that gm test
                     // doesn't actually run?  For now, those cases
                     // will always be ignored, because gm only looks
                     // at expectations that correspond to gm tests
                     // that were actually run.
@@ skipping 1465 matching lines @@
     if (FLAGS_forceBWtext) {
         canvas->setDrawFilter(SkNEW(BWTextDrawFilter))->unref();
     }
 }
 
 #if !defined(SK_BUILD_FOR_IOS) && !defined(SK_BUILD_FOR_NACL)
 int main(int argc, char * const argv[]) {
     return tool_main(argc, (char**) argv);
 }
 #endif