message: Mirror CI builders in the try pool
  This will allow testing specific configurations that are on CI
  builders when trying to fix them.
diff: @@ -198,30 +198,53 @@ buckets: {
  service_account: "dawn-try-builder@chops-service-accounts.iam.gserviceaccount.com"
  }
  + # A subset of the CI configurations are used for the CQ. We still mirror
  + # the CI builders here so we can trigger tryjobs on their specific
  + # configuration.
  +
  + # CI Mirror only
  builders {
  name: "linux-clang-dbg-x64"
  dimensions: "os:Ubuntu-14.04"
  mixins: "debug"
  mixins: "x64"
  }
  + # CI Mirror only
  + builders {
  + name: "linux-clang-dbg-x86"
  + dimensions: "os:Ubuntu-14.04"
  + mixins: "debug"
  + mixins: "x86"
  + }
  + # Actually on the CQ
  builders {
  name: "linux-clang-rel-x64"
  dimensions: "os:Ubuntu-14.04"
  mixins: "release"
  mixins: "x64"
  }
  + # Actually on the CQ
  + builders {
  + name: "linux-clang-rel-x86"
  + dimensions: "os:Ubuntu-14.04"
  + mixins: "release"
  + mixins: "x86"
  + }
  + # Actually on the CQ
  builders {
  name: "mac-dbg"
  dimensions: "os:Mac"
  mixins: "debug"
  }
  + # Actually on the CQ
  builders {
  name: "mac-rel"
  dimensions: "os:Mac"
  mixins: "release"
  }
  + # Actually on the CQ
  builders {
  name: "win-clang-dbg-x64"
  dimensions: "os:Windows"
  @@ -229,6 +252,15 @@ buckets: {
  mixins: "debug"
  mixins: "x64"
  }
  + # CI Mirror only
  + builders {
  + name: "win-clang-dbg-x86"
  + dimensions: "os:Windows"
  + mixins: "clang"
  + mixins: "debug"
  + mixins: "x86"
  + }
  + # Actually on the CQ
  builders {
  name: "win-clang-rel-x64"
  dimensions: "os:Windows"
  @@ -236,5 +268,29 @@ buckets: {
  mixins: "release"
  mixins: "x64"
  }
  + # CI Mirror only
  + builders {
  + name: "win-clang-rel-x86"
  + dimensions: "os:Windows"
  + mixins: "clang"
  + mixins: "release"
  + mixins: "x86"
  + }
  + # CI Mirror only
  + builders {
  + name: "win-msvc-dbg-x64"
  + dimensions: "os:Windows"
  + mixins: "no_clang"
  + mixins: "debug"
  + mixins: "x64"
  + }
  + # CI Mirror only
  + builders {
  + name: "win-msvc-rel-x64"
  + dimensions: "os:Windows"
  + mixins: "no_clang"
  + mixins: "release"
  + mixins: "x64"
  + }
  }
  }
  