Add a PRESUBMIT check for broken .ico files.

ui/resources/resource_check/ico_files.py

Index: ui/resources/resource_check/ico_files.py
diff --git a/ui/resources/resource_check/ico_files.py b/ui/resources/resource_check/ico_files.py
new file mode 100644
index 0000000000000000000000000000000000000000..26bd36788c9d8f46bf4eb8c91b86a06d83d83d5f
--- /dev/null
+++ b/ui/resources/resource_check/ico_files.py
@@ -0,0 +1,57 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Presubmit script for Chromium browser resources.
+
+See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
+for more details about the presubmit API built into depot_tools, and see
+http://www.chromium.org/developers/web-development-style-guide for the rules
+we're checking against here.
+"""
+
+import os
+import sys
+
+class IcoFiles(object):
+  """Verifier of ICO files for Chromium resources.
+  """
+
+  def __init__(self, input_api, output_api):
+    """ Initializes IcoFiles with path."""
+    self.input_api = input_api
+    self.output_api = output_api
+
+    tool_path = input_api.os_path.join(input_api.PresubmitLocalPath(),
+        '../../../tools/resources')
+    sys.path.insert(0, tool_path)
+
+  def RunChecks(self):
+    """Verifies the correctness of the ICO files.
+
+    Returns:
+        An array of presubmit errors if any ICO files were broken in some way.
+    """
+    results = []
+    affected_files = self.input_api.AffectedFiles(include_deletes=False)
+    for f in affected_files:
+      path = f.LocalPath()
+      if os.path.splitext(path)[1].lower() != '.ico':
+        continue
+
+      # Import this module from here (to avoid importing it in the highly common
+      # case where there are no ICO files being changed).
+      import ico_tools
+
+      repository_path = self.input_api.change.RepositoryRoot()
+
+      with open(os.path.join(repository_path, path), 'rb') as ico_file:
+        errors = list(ico_tools.LintIcoFile(ico_file))
+        if errors:
+          error_string = '\n'.join('    * ' + e for e in errors)
+          results.append(self.output_api.PresubmitError(
+              '%s: This file does not meet the standards for Chromium ICO '
+              'files.\n%s\n    Please run '
+              'tools/resources/optimize-ico-files.py on this file. See '
+              'chrome/app/theme/README for details.' % (path, error_string)))
+    return results