Android: update patch size reference APKs for m59.

build/android/binary_size/apks/README.md

 ### Updating APKs in this folder (for new milestones, builders, or APKs)
 
 1. Find the commit as close as possible to the current branch point (i.e. if the
 latest builds are m59, we want to compare to the commit before the m58 branch
 point).
 
-2. Download and unzip build artifacts from the relevant perf builder. You can
-use this link:
-[https<nolink>://storage.cloud.google.com/chrome-perf/**Android%20Builder**/full-build-linux_**3a87aecc31cd1ffe751dd72c04e5a96a1fc8108a**.zip](https://storage.cloud.google.com/chrome-perf/Android%20Builder/full-build-linux_3a87aecc31cd1ffe751dd72c04e5a96a1fc8108a.zip)
-, replacing the bolded parts with your info OR from the
-"gsutil upload_build_product" step on the bot page (both are Googlers only).
+2. Download and unzip build artifacts from the relevant perf builder.
 
-3. Upload the apk: _upload_to_google_storage.py --bucket
-'chromium-android-tools/apks/**Android_Builder**/**58**'
-**path/to/ApkTarget.apk**_ replacing the bolded parts again.
-  * Note that we use **Android_Builder** instead of **Android Builder** (replace
-spaces with underscores)
+    gsutil.py cp 'gs://chrome-perf/Android Builder/full-build-linux_COMMITHASH.zip' /dest/dir
 
-4. Move the generated .sha1 file to the corresponding place in
-//build/android/binary_size/apks/. In this case, the path would be
-//build/android/binary_size/apks/Android_Builder/58
+3. Unzip. Steps 4, 5, and 6 must be done for MonochromePublic.apk for
+`gs://chrome-perf/Android Builder` and ChromeModernPublic.apk for
+`gs://chrome-perf/Android arm64 Builder` (and can be done for additional APKS,
+but these are the ones used by `build/android/resource_sizes.py`)
 
-5. Commit the added .sha1 files and (optionally) update the `CURRENT_MILESTONE`
+4. Upload the apk (replacing the bolded parts again - note that we use
+**Android_Builder** instead of **Android Builder** (replace spaces with
+underscores):
+
+    upload_to_google_storage.py --bucket 'chromium-android-tools/apks/Android_Builder/58' dest/dir/MonochromePublic.apk
+
+5. Move the generated .sha1 file to the corresponding place in
+`//build/android/binary_size/apks/`. In this case, the path would be
+`//build/android/binary_size/apks/Android_Builder/58`
+
+6. Commit the added .sha1 files and (optionally) update the `CURRENT_MILESTONE`
 in apk_downloader.py