InlineEdit: Add utility class to modify edits

Change-Id: Ic5b102e78ae9af28eee85b7baa920197347e0924
InlineEdit: Factor out get content method for file resource

Currently there are two callers of get content class for file resources.
Extract this method in FileContentUtil class to reuse it also for inline
edit feature.

Change-Id: Ie43846d20170fd12c8c87e26349ffa85dc8296ff
InlineEdit: Add acceptance test for edit operations

Change-Id: Ic89ee8b0945220bfb1f3f356b93385fb81f91c20
InlineEdit: Add change edit collection and resource

Change-Id: I3039fdccd214d748d5c06d1019f34caf756bbf1f
Merge topic 'inline-3'

* changes:
  InlineEdit: Add change edit collection and resource
  InlineEdit: Add acceptance test for edit operations
  InlineEdit: Factor out get content method for file resource
  InlineEdit: Add utility class to modify edits