[Presubmit] check for single quotes in html properties

chrome/browser/web_dev_style/html_checker.py

Index: chrome/browser/web_dev_style/html_checker.py
diff --git a/chrome/browser/web_dev_style/html_checker.py b/chrome/browser/web_dev_style/html_checker.py
index 422b7852185410a6f833185faee07bc96a269034..0c8df98ee55b7a1f6cd16da8557b1e11c79866ac 100644
--- a/chrome/browser/web_dev_style/html_checker.py
+++ b/chrome/browser/web_dev_style/html_checker.py
@@ -44,6 +44,17 @@ class HtmlChecker(object):
     return regex_check.RegexCheck(self.input_api.re, line_number, line, regex,
         'Use the button element instead of <input type="button">')
 
+  def DoNotUseSingleQuotesCheck(self, line_number, line):
+    regex = self.input_api.re.compile("""
+        <\S+                           # The tag name.
+        (?:\s+\S+\$?="[^"]*"|\s+\S+)*  # Correctly quoted or non-value props.
+        \s+(\S+\$?='[^']*')            # Find incorrectly quoted (foo='bar').
+        [^>]*>                         # To the end of the tag.
+        """,
+        self.input_api.re.MULTILINE | self.input_api.re.VERBOSE)
+    return regex_check.RegexCheck(self.input_api.re, line_number, line, regex,
+        'Use double quotes rather than single quotes in HTML properties')
+
   def I18nContentJavaScriptCaseCheck(self, line_number, line):
     regex = self.input_api.re.compile("""
         (?:^|\s)                      # start of line or whitespace