This function also re-initializes a ChangeComment object, but uses the
old values for comments and robot comments, and only makes a request for
new drafts.
It's response is identical to loadAll for the purposes of elements using
these functions, but will reduce unneeded API calls.
Change-Id: I3c0872b86a0e24c9c378acf3311fe8cc3e078eda
Previously, nested components (that are never standalone) were making
their own requests for comments, creating unecessary duplicate API
requests.
Some requests were made to the rest API directly (for example,
gr-change-view requested comments this way), and some were through the
gr-comment-api, which also helped handle comment manipulation and
reorganization.
Instead of ad-hoc comment requesting, move all comment requests to the
top level (standalone) component, and use an object prototype to
generate _changeComments as a property on gr-comment-api. This is an
immutable object that can be passed to the inner components
(file list, etc), and includes the methods needed to manipulate
comments into the forms
necessary.
When a child component needs to trigger a refresh of the comments, fire
an event that the parent event handles (see gr-file-list l.867).
Bug: Issue 6953
Change-Id: Ic4b6cf16520baae65d8cf956c311a60f2a70a2e1
