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This CL adds cameraMediaConsolidated as one of the preference key value
pairs that can be set through chromeosInfoPrivate API. The preference is
useful for determining which camera app (Chrome camera app or Google camera
app) to open when users click the camera icon.

cameraMediaConsolidated preference

Bug: 861952
Test: Chrome extension can call chromeosInfoPrivate.set() to set
Change-Id: I8960734d5bb44712a86c7998081c91e750d963cd
Reviewed-on: https://chromium-review.googlesource.com/1130543
Commit-Queue: Sheng-hao Tsao <shenghao@google.com>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#574984}