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+This directory contains prebuilt tools used during end-to-end tests.
+They will be downloaded by their SHA1 hash, and are not meant to be checked in.
+
+Updating prebuilt_apprtc.zip:
+
+- Follow AppRTC instructions:
+    - `git clone https://github.com/webrtc/apprtc`
+    - Install NodeJS:
+        - Download <https://nodejs.org/> and extract it
+        - `export PATH="$(pwd)/node-v6.10.3-linux-x64/bin:$PATH"`
+    - `cd apprtc`
+    - `npm install`
+    - `export PATH="$(pwd)/node_modules/.bin:$PATH"`
+    - `pip install --user --upgrade pip setuptools` - needed only on old systems
+    - `grunt`
+- Vendor collider's dependencies:
+    - `ln -s "$(pwd)/src/collider" src/src`
+    - `GOPATH="$(pwd)/src" go get -d collidermain`
+    - `rm src/src`
+- Install additional components:
+    - `python temp/google-cloud-sdk/bin/dev_appserver.py out/app_engine`
+        - Stop it and run the suggestion: `./temp/google-cloud-sdk/bin/gcloud
+          components install app-engine-python-extras`
+- Remove largest unneeded files:
+    - `rm -rf .git node_modules browsers
+      temp/google-cloud-sdk/.install/.{backup,download}
+      temp/google-cloud-sdk/platform/google_appengine/lib/django-*`
+- `zip -r prebuilt_apprtc.zip apprtc/`
+- `mv prebuilt_apprtc.zip webrtc/src/rtc_tools/testing/prebuilt_apprtc.zip`
+
+Updating golang/*:
+
+- Go to <https://golang.org/dl/>
+- Download these files:
+    - go*.linux-amd64.tar.gz -> golang/linux/go.tar.gz
+    - go*.darwin-amd64.tar.gz -> golang/mac/go.tar.gz
+    - go*.windows-amd64.zip -> golang/windows/go.zip
+
+After updating the archives:
+
+- `cd webrtc/src/rtc_tools/testing`
+- For each updated archive:
+    - `upload_to_google_storage.py file.zip --bucket=chromium-webrtc-resources`
+- `git commit -a && git cl upload`