The DiffViewerView now provides information about the DiffCommits on

the selected revision. The DiffViewerPageView and associated models

have been updated to parse this information. The information on

DiffCommits is shown in the diffviewer now via the DiffCommitIndexView,

which renders a table similar to the DiffCommitListField on a review

request.
When the diff revision slider is moved to select a diff revision, the

DiffCommitListField will automatically update and populate the table

with information from the individual diff commits pertaining to the

selected revision. If the selected diff revision does not have any

commits, then the table will be hidden until a revision is selected that

does have associated commits.

Manually verified the following:

Selecting the base and a diff revision that had commits displayed the

   commit table.
Selecting the base and a diff revision that did not have commits did

   not display the table.
Switching from one diff revision to another with different commits

   changed the table to display the new commits.