Wyatt Allen 88678da403 Add support for images in diffs ...

If gr-diff recognizes that the file difference it's representing is
between images, it uses a different diff-builder that displays images
in a side-by-side-manner. In this case gr-diff will also make requests
for the image data itself, which it can pass down into the image-based
diff-builder.

Adds methods to gr-rest-api-interface to support rendering the data
relevant to image diffs. For images that are revisions of the current
change, provides "getChangeFileContents". For images that come from the
parent tree (i.e. if the basePatchNum is "PARENT") the interface
provides "getCommitInfo" to determine the SHA of the parent commit, and
"getCommitFileContents" which can get file contents for a given commit.

Bug: Issue 3822
Change-Id: I9be025b4e549fca97c87cdbeede6cb64dea5eac0

2016-05-26 12:02:29 -07:00

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