Thread sub-builders for every engine-uploading builder (flutter#173742)

matanlurey · web-flow · commit d0851959fead · 2025-08-14T16:05:26.000Z
Closes flutter#173655. We should consider making these flags either the default (opt-out to `false`) or evergreen (no opt-out).
diff --git a/engine/src/flutter/ci/builders/linux_arm_host_engine.json b/engine/src/flutter/ci/builders/linux_arm_host_engine.json
@@ -8,6 +8,8 @@
         "definition files."
     ],
     "luci_flags": {
+      "delay_collect_builds": true,
+      "parallel_download_builds": true,
       "upload_content_hash": true
     },
     "builds": [
diff --git a/engine/src/flutter/ci/builders/linux_host_desktop_engine.json b/engine/src/flutter/ci/builders/linux_host_desktop_engine.json
@@ -8,6 +8,8 @@
         "definition files."
     ],
     "luci_flags": {
+      "delay_collect_builds": true,
+      "parallel_download_builds": true,
       "upload_content_hash": true
     },
     "builds": [
diff --git a/engine/src/flutter/ci/builders/linux_web_engine_build.json b/engine/src/flutter/ci/builders/linux_web_engine_build.json
@@ -8,6 +8,8 @@
       "definition files."
   ],
   "luci_flags": {
+    "delay_collect_builds": true,
+    "parallel_download_builds": true,
     "upload_content_hash": true
   },
   "builds": [
diff --git a/engine/src/flutter/ci/builders/mac_android_aot_engine.json b/engine/src/flutter/ci/builders/mac_android_aot_engine.json
@@ -8,6 +8,8 @@
         "definition files."
     ],
     "luci_flags": {
+      "delay_collect_builds": true,
+      "parallel_download_builds": true,
       "upload_content_hash": true
     },
     "builds": [
diff --git a/engine/src/flutter/ci/builders/windows_android_aot_engine.json b/engine/src/flutter/ci/builders/windows_android_aot_engine.json
@@ -1,5 +1,7 @@
 {
     "luci_flags": {
+      "delay_collect_builds": true,
+      "parallel_download_builds": true,
       "upload_content_hash": true
     },
     "builds": [
diff --git a/engine/src/flutter/ci/builders/windows_arm_host_engine.json b/engine/src/flutter/ci/builders/windows_arm_host_engine.json
@@ -1,6 +1,8 @@
 {
     "luci_flags": {
-        "upload_content_hash": true
+      "delay_collect_builds": true,
+      "parallel_download_builds": true,
+      "upload_content_hash": true
     },
     "builds": [
         {
diff --git a/engine/src/flutter/ci/builders/windows_host_engine.json b/engine/src/flutter/ci/builders/windows_host_engine.json
@@ -8,6 +8,8 @@
         "definition files."
     ],
     "luci_flags": {
+      "delay_collect_builds": true,
+      "parallel_download_builds": true,
       "upload_content_hash": true
     },
     "builds": [

Original file line number	Diff line number	Diff line change
`@@ -1,5 +1,7 @@`
`1`	`1`	`{`
`2`	`2`	`"luci_flags": {`
	`3`	`+ "delay_collect_builds": true,`
	`4`	`+ "parallel_download_builds": true,`
`3`	`5`	`"upload_content_hash": true`
`4`	`6`	`},`
`5`	`7`	`"builds": [`
Original file line number	Diff line number	Diff line change
`@@ -1,6 +1,8 @@`
`1`	`1`	`{`
`2`	`2`	`"luci_flags": {`
`3`		`- "upload_content_hash": true`
	`3`	`+ "delay_collect_builds": true,`
	`4`	`+ "parallel_download_builds": true,`
	`5`	`+ "upload_content_hash": true`
`4`	`6`	`},`
`5`	`7`	`"builds": [`
`6`	`8`	`{`