Reland "infra: Migrate builders to Goma RBE (iOS Week 1a)"

This is a reland of 765c53e1

Original change's description:
> infra: Migrate builders to Goma RBE (iOS Week 1a)
> 
> These are the two builders in webrtc.fyi:
> - WebRTC Chromium FYI ios-device
> - WebRTC Chromium FYI ios-simulator
> 
> These builders are small. They are expected to have a peak traffic of
> 15 QPS:
> https://docs.google.com/spreadsheets/d/1-XKh-CqSoUcXEqCETVywjmIo1C18P0qEBDCY50ozBb0/edit#gid=1721756715
> 
> Schedule of migration:
> https://docs.google.com/spreadsheets/d/1TZhpasm6iceYm7zqkyEtZ1wn9ZcpREfH4LV4cusICJA/edit#gid=0
> 
> R=agable@chromium.org, bpastene@chromium.org, jbudorick@chromium.org, tikuta@chromium.org
> 
> Bug: 950413
> Change-Id: Id47cc7887bbefaf4dfe9f72275b80c8f04c428a7
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2043185
> Reviewed-by: Yoshisato Yanagisawa <yyanagisawa@google.com>
> Reviewed-by: Ben Pastene <bpastene@chromium.org>
> Reviewed-by: smut <smut@google.com>
> Commit-Queue: Simon Que <sque@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#739771}

Bug: 950413
Change-Id: Id3ffe0babda0e347bd80dce0c253d93c5ad29946
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2089176Reviewed-by: John Budorick <jbudorick@chromium.org>
Reviewed-by: smut <smut@google.com>
Commit-Queue: Simon Que <sque@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747624}

infra/config/buckets/webrtc.fyi.star

@@ -151,6 +151,7 @@ builder(
     name = 'WebRTC Chromium FYI ios-device',
     caches = [xcode_cache.x11c29],
     executable = 'recipe:webrtc/chromium_ios',
+    goma_backend = goma.backend.RBE_PROD,
     os = os.MAC_ANY,
 )
 
@@ -158,5 +159,6 @@ builder(
     name = 'WebRTC Chromium FYI ios-simulator',
     caches = [xcode_cache.x11c29],
     executable = 'recipe:webrtc/chromium_ios',
+    goma_backend = goma.backend.RBE_PROD,
     os = os.MAC_ANY,
 )

infra/config/consoles/chromium.goma.migration.star

@@ -1154,5 +1154,15 @@ luci.console_view(
             category = 'cros|week3|kevin',
             short_name = 'hwtests',
         ),
+        luci.console_view_entry(
+            builder = 'webrtc.fyi/WebRTC Chromium FYI ios-device',
+            category = 'ios|week1a',
+            short_name = 'dev',
+        ),
+        luci.console_view_entry(
+            builder = 'webrtc.fyi/WebRTC Chromium FYI ios-simulator',
+            category = 'ios|week1a',
+            short_name = 'sim',
+        ),
     ],
 )

infra/config/generated/cr-buildbucket.cfg

@@ -20385,6 +20385,7 @@ buckets: <
         name: "webrtc/chromium_ios"
         cipd_package: "infra/recipe_bundles/chromium.googlesource.com/chromium/tools/build"
         cipd_version: "refs/heads/master"
+        properties_j: "$build/goma:{\"rpc_extra_params\":\"?prod\",\"server_host\":\"goma.chromium.org\"}"
         properties_j: "mastername:\"chromium.webrtc.fyi\""
       >
       execution_timeout_secs: 7200
@@ -20406,6 +20407,7 @@ buckets: <
         name: "webrtc/chromium_ios"
         cipd_package: "infra/recipe_bundles/chromium.googlesource.com/chromium/tools/build"
         cipd_version: "refs/heads/master"
+        properties_j: "$build/goma:{\"rpc_extra_params\":\"?prod\",\"server_host\":\"goma.chromium.org\"}"
         properties_j: "mastername:\"chromium.webrtc.fyi\""
       >
       execution_timeout_secs: 7200

infra/config/generated/luci-milo.cfg

@@ -5481,6 +5481,16 @@ consoles: <
     category: "cros|week3|kevin"
     short_name: "hwtests"
   >
+  builders: <
+    name: "buildbucket/luci.chromium.webrtc.fyi/WebRTC Chromium FYI ios-device"
+    category: "ios|week1a"
+    short_name: "dev"
+  >
+  builders: <
+    name: "buildbucket/luci.chromium.webrtc.fyi/WebRTC Chromium FYI ios-simulator"
+    category: "ios|week1a"
+    short_name: "sim"
+  >
   header: <
     oncalls: <
       name: "Chromium"

ios/build/bots/chromium.webrtc.fyi/WebRTC Chromium FYI ios-device.json

@@ -7,6 +7,7 @@
   "gn_args": [
     "goma_dir=\"$(goma_dir)\"",
     "ios_enable_code_signing=false",
+    "ios_use_goma_rbe=true",
     "is_component_build=false",
     "is_debug=false",
     "target_cpu=\"arm64\"",

ios/build/bots/chromium.webrtc.fyi/WebRTC Chromium FYI ios-simulator.json

@@ -6,6 +6,7 @@
   "gn_args": [
     "goma_dir=\"$(goma_dir)\"",
     "ios_enable_code_signing=false",
+    "ios_use_goma_rbe=true",
     "is_component_build=false",
     "is_debug=true",
     "symbol_level=1",