Cross Reference: /external/chromium_org/tools/imagediff

`Name`	`Date`	`Size`
Up to higher level directory
`BUILD.gn`	10-Mar-2015	`509`
`DEPS`	16-Dec-2014	`81`
`image_diff.cc`	10-Mar-2015	`14.6K`
`image_diff.gyp`	16-Dec-2014	`1K`
`image_diff_png.cc`	16-Dec-2014	`20K`
`image_diff_png.h`	16-Dec-2014	`1.1K`