Resubmit issue 2221103002 to fix the iOS build by declaring the flag in

tools/flags/SkCommonFlags.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkCommonFlags.h"
 #include "SkOSFile.h"
 
@@ skipping 47 matching lines @@
 DEFINE_bool2(veryVerbose, V, false, "tell individual tests to be verbose.");
 
 DEFINE_string2(writePath, w, "", "If set, write bitmaps here as .pngs.");
 
 DEFINE_string(key, "",
               "Space-separated key/value pairs to add to JSON identifying this builder.");
 DEFINE_string(properties, "",
               "Space-separated key/value pairs to add to JSON identifying this run.");
 DEFINE_bool2(pre_log, p, false, "Log before running each test. May be incomprehensible when threading");
 
+DEFINE_bool(analyticAA, false, "Analytic Anati-Alias");
+
 bool CollectImages(SkCommandLineFlags::StringArray images, SkTArray<SkString>* output) {
     SkASSERT(output);
 
     static const char* const exts[] = {
         "bmp", "gif", "jpg", "jpeg", "png", "webp", "ktx", "astc", "wbmp", "ico",
         "BMP", "GIF", "JPG", "JPEG", "PNG", "WEBP", "KTX", "ASTC", "WBMP", "ICO",
 #ifdef SK_CODEC_DECODES_RAW
         "arw", "cr2", "dng", "nef", "nrw", "orf", "raf", "rw2", "pef", "srw",
         "ARW", "CR2", "DNG", "NEF", "NRW", "ORF", "RAF", "RW2", "PEF", "SRW",
 #endif
@@ skipping 21 matching lines @@
                 SkDebugf("No supported images found in %s!\n", flag);
                 return false;
             }
         } else {
             // Also add the value if it is a single image
             output->push_back() = flag;
         }
     }
     return true;
 }