Treat bad values passed to --images as a fatal error

bench/nanobench.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 <ctype.h>
 
 #include "nanobench.h"
@@ skipping 587 matching lines @@
             SkDebugf("Can't parse %s from --zoom as a zoomMax,zoomPeriodMs.\n", FLAGS_zoom[0]);
             exit(1);
         }
 
         if (FLAGS_mpd) {
             fUseMPDs.push_back() = true;
         }
         fUseMPDs.push_back() = false;
 
         // Prepare the images for decoding
-        for (int i = 0; i < FLAGS_images.count(); i++) {
-            const char* flag = FLAGS_images[i];
-            if (sk_isdir(flag)) {
-                // If the value passed in is a directory, add all the images
-                SkOSFile::Iter it(flag);
-                SkString file;
-                while (it.next(&file)) {
-                    fImages.push_back() = SkOSPath::Join(flag, file.c_str());
-                }
-            } else if (sk_exists(flag)) {
-                // Also add the value if it is a single image
-                fImages.push_back() = flag;
-            }
+        if (!CollectImages(&fImages)) {
+            exit(1);
         }
 
         // Choose the candidate color types for image decoding
         const SkColorType colorTypes[] =
             { kN32_SkColorType,
               kRGB_565_SkColorType,
               kAlpha_8_SkColorType,
               kIndex_8_SkColorType,
               kGray_8_SkColorType };
         fColorTypes.reset(colorTypes, SK_ARRAY_COUNT(colorTypes));
@@ skipping 633 matching lines @@
 
     return 0;
 }
 
 #if !defined SK_BUILD_FOR_IOS
 int main(int argc, char** argv) {
     SkCommandLineFlags::Parse(argc, argv);
     return nanobench_main();
 }
 #endif