Introduce a course_tool plugin entry point and migrate the updates, bookmarks and reviews tools into plugins.

openedx/features/course_bookmarks/plugins.py

@@ -0,0 +1,40 @@
+"""
+Platform plugins to support course bookmarks.
+"""
+
+from django.core.urlresolvers import reverse
+from django.utils.translation import ugettext as _
+from openedx.features.course_experience.course_tools import CourseTool
+
+
+class CourseBookmarksTool(CourseTool):
+    """
+    The course bookmarks tool.
+    """
+    @classmethod
+    def is_enabled(cls, course_key):
+        """
+        Always show the bookmarks tool.
+        """
+        return True
+
+    @classmethod
+    def title(cls):
+        """
+        Returns the title of this tool.
+        """
+        return _('Bookmarks')
+
+    @classmethod
+    def icon_classes(cls):
+        """
+        Returns the icon classes needed to represent this tool.
+        """
+        return 'fa fa-bookmark'
+
+    @classmethod
+    def url(cls, course_key):
+        """
+        Returns the URL for this tool for the specified course key.
+        """
+        return reverse('openedx.course_bookmarks.home', args=[course_key])