implement --quiet for DM

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 71 matching lines @@
             }
         }
     }
     if (!FLAGS_verbose) {
         note = "";
     }
     if (!log.isEmpty()) {
         log.prepend("\n");
     }
     auto pending = sk_atomic_dec(&gPending)-1;
-    SkDebugf("%s(%4d/%-4dMB %5d) %s\t%s%s%s", FLAGS_verbose ? "\n" : kSkOverwriteLine
-                                       , sk_tools::getCurrResidentSetSizeMB()
-                                       , sk_tools::getMaxResidentSetSizeMB()
-                                       , pending
-                                       , HumanizeMs(ms).c_str()
-                                       , id.c_str()
-                                       , note.c_str()
-                                       , log.c_str());
+    if (!FLAGS_quiet) {
+        SkDebugf("%s(%4d/%-4dMB %5d) %s\t%s%s%s", FLAGS_verbose ? "\n" : kSkOverwriteLine
+                                           , sk_tools::getCurrResidentSetSizeMB()
+                                           , sk_tools::getMaxResidentSetSizeMB()
+                                           , pending
+                                           , HumanizeMs(ms).c_str()
+                                           , id.c_str()
+                                           , note.c_str()
+                                           , log.c_str());
+    }
     // We write our dm.json file every once in a while in case we crash.
     // Notice this also handles the final dm.json when pending == 0.
     if (pending % 500 == 0) {
         JsonWriter::DumpJson();
     }
 }
 
 static void start(ImplicitString config, ImplicitString src,
                   ImplicitString srcOptions, ImplicitString name) {
     SkString id = SkStringPrintf("%s %s %s %s", config.c_str(), src.c_str(),
@@ skipping 648 matching lines @@
     }
     return 0;
 }
 
 #if !defined(SK_BUILD_FOR_IOS)
 int main(int argc, char** argv) {
     SkCommandLineFlags::Parse(argc, argv);
     return dm_main();
 }
 #endif