tree 68a2237c6a028c88de1bf947374394ba03c18ef5
parent 41d9fa63c3c3cb53b6420f648805ab5d421ee981
author Wyatt Allen <wyatta@google.com> 1464049123 -0700
committer Wyatt Allen <wyatta@google.com> 1464289349 -0700

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