Push registration should read a "gcm_user_visible_only" key from the Manifest.

content/renderer/manifest/manifest_parser.h

Index: content/renderer/manifest/manifest_parser.h
diff --git a/content/renderer/manifest/manifest_parser.h b/content/renderer/manifest/manifest_parser.h
index 6e5f8a9a988eb8994bac7946b7e9151337a14357..94b7e025db8321eb99191548c7f98338147f2eaa 100644
--- a/content/renderer/manifest/manifest_parser.h
+++ b/content/renderer/manifest/manifest_parser.h
@@ -43,6 +43,13 @@ class CONTENT_EXPORT ManifestParser {
     NoTrim
   };
 
+  // Helper function to parse booleans present on a given |dictionary| in a
+  // given field identified by its |key|.
+  // Returns the parsed boolean if any, or |default_value| if parsing failed.
+  bool ParseBoolean(const base::DictionaryValue& dictionary,
+                    const std::string& key,
+                    bool default_value);
+
   // Helper function to parse strings present on a given |dictionary| in a given
   // field identified by its |key|.
   // Returns the parsed string if any, a null string if the parsing failed.
@@ -123,6 +130,11 @@ class CONTENT_EXPORT ManifestParser {
   base::NullableString16 ParseGCMSenderID(
       const base::DictionaryValue& dictionary);
 
+  // Parses the 'gcm_user_visible_only' field of the manifest.
+  // This is a proprietary extension of the Web Manifest specification.
+  // Returns true iff the string could be parsed as the boolean true.
+  bool ParseGCMUserVisibleOnly(const base::DictionaryValue& dictionary);
+
   const base::StringPiece& data_;
   const GURL& manifest_url_;
   const GURL& document_url_;