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Config mb so that this try builder can build with needed gn configs.

Bug: 943883
Change-Id: Iad397828705170bf88040922cb4a8d1d74e9dd95
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2101723Reviewed-by: Aaron Gable <agable@chromium.org>
Commit-Queue: Zhaoyang Li <zhaoyangli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#750236}