Add metrics for paths in file scheme exceptions in content settings.

components/content_settings/core/common/content_settings_pattern.cc

Index: components/content_settings/core/common/content_settings_pattern.cc
diff --git a/components/content_settings/core/common/content_settings_pattern.cc b/components/content_settings/core/common/content_settings_pattern.cc
index 348892e5d1523be701aa21a356b6aab3c60cb8c3..c86044ef639783a0e769bf69be8f0cffe5ca2c63 100644
--- a/components/content_settings/core/common/content_settings_pattern.cc
+++ b/components/content_settings/core/common/content_settings_pattern.cc
@@ -614,6 +614,11 @@ ContentSettingsPattern::SchemeType ContentSettingsPattern::GetScheme() const {
   return SCHEME_OTHER;
 }
 
+bool ContentSettingsPattern::HasPath() const {
+  DCHECK_EQ(GetScheme(), SCHEME_FILE);
+  return !parts_.is_path_wildcard && !parts_.path.empty();
+}
+
 ContentSettingsPattern::Relation ContentSettingsPattern::Compare(
     const ContentSettingsPattern& other) const {
   // Two invalid patterns are identical in the way they behave. They don't match