rebaseline.py: add --keep-going-on-failure option, off by default

tools/rebaseline_imagefiles.py

 #!/usr/bin/python
 

[epoger, 2013/07/12 19:34:53]

Verified that the bug is gone by rebaselining all new tests using the script
after this CL...

tools/rebaseline.py --expectations-root ~/src/skia/gm-expected/ --add-new \
  && echo READY TO COMMIT!

[borenet, 2013/07/12 19:51:37]

Do we ever expect this type of thing to happen again?  If so, should this script
fail, or should we warn loudly and have a script (like
http://skia.googlecode.com/svn/trunk/tools/verify_images_for_gm_results.py) to
turn something red?

 '''
 Copyright 2013 Google Inc.
 
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file.
 '''
 
 '''
 Rebaselines GM test results as individual image files
 (the "old way", before https://goto.google.com/ChecksumTransitionDetail ).
@@ skipping 258 matching lines @@
             if self._tests:
                 if test not in self._tests:
                     skipped_files.append(filename)
                     continue
             if self._configs:
                 if config not in self._configs:
                     skipped_files.append(filename)
                     continue
             outfilename = os.path.join(self._expectations_root, subdir,
                                        filename);
-            # TODO(epoger): Until we resolve
-            # https://code.google.com/p/skia/issues/detail?id=1410 ('some GM
-            # result images not available for download from Google Storage'),
-            # keep going in the face of missing results for any one test.
-            try:
-                self._RebaselineOneFile(expectations_subdir=subdir,
-                                        builder_name=builder,
-                                        infilename=filename,
-                                        outfilename=outfilename,
-                                        all_results=all_results)
-            except Exception as e:
-                print 'WARNING: swallowing exception %s' % e
+            self._RebaselineOneFile(expectations_subdir=subdir,
+                                    builder_name=builder,
+                                    infilename=filename,
+                                    outfilename=outfilename,
+                                    all_results=all_results)