Add/Update external Reclient build instructions
Bug: b/291868532
Change-Id: I54e6225ab01e12141957949d5c8c35b32e5062d5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5159847
Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Commit-Queue: Andrew Williams <awillia@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1244750}
diff --git a/docs/android_build_instructions.md b/docs/android_build_instructions.md
index e0f44cf..f02fc6465 100644
--- a/docs/android_build_instructions.md
+++ b/docs/android_build_instructions.md
@@ -161,6 +161,28 @@
as the WebView provider.
***
+### Faster builds
+
+This section contains some things you can change to speed up your builds,
+sorted so that the things that make the biggest difference are first.
+
+#### Use Reclient
+
+*** note
+**Warning:** If you are a Google employee, do not follow the instructions below.
+See
+[go/building-android-chrome#initialize-remote-execution-distributed-builds](https://goto.google.com/building-android-chrome#initialize-remote-execution-distributed-builds)
+instead.
+***
+
+Chromium's build can be sped up significantly by using a remote execution system
+compatible with [REAPI](https://github.com/bazelbuild/remote-apis). This allows
+you to benefit from remote caching and executing many build actions in parallel
+on a shared cluster of workers.
+
+To use Reclient, follow the corresponding
+[Linux build instructions](linux/build_instructions.md#use-reclient).
+
## Build Chromium
Build Chromium with Ninja using the command:
