Add scripts for rolling and generating Android.bp for AOSP

scripts/roll_aosp.sh

+#!/bin/bash
+
+#  Copyright The ANGLE Project Authors. All rights reserved.
+#  Use of this source code is governed by a BSD-style license that can be
+#  found in the LICENSE file.
+#
+# Generates a roll CL within the ANGLE repository of AOSP.
+
+git checkout -b tmp aosp/upstream-mirror
+git merge -s ours master --allow-unrelated-histories -m "Merge remote-tracking branch 'aosp/upstream-mirror' into aosp-master"
+git checkout master
+git merge tmp
+git branch -D tmp
+
+deps=(
+    "third_party/spirv-tools/src"
+    "third_party/glslang/src"
+    "third_party/spirv-headers/src"
+    "third_party/jsoncpp"
+    "third_party/jsoncpp/source"
+)
+
+# Delete dep directories so that gclient can check them out
+for dep in ${deps[@]}; do
+    rm -rf --preserve-root $dep
+done
+
+# Sync all of ANGLE's deps so that 'gn gen' works
+python scripts/bootstrap.py
+gclient sync -D
+
+# generate gn build files and convert them to blueprints
+gn gen out/Android --args="target_os = \"android\" is_component_build = false is_debug = false android32_ndk_api_level = 26 android64_ndk_api_level = 26"
+gn desc out/Android --format=json "*" > out/Android/desc.json
+python scripts/generate_android_bp.py out/Android/desc.json > Android.bp
+rm -r out
+git add Android.bp
+
+# Delete the .git files in each dep so that it can be added to this repo. Some deps like jsoncpp
+# have multiple layers of deps so delete everything before adding them.
+for dep in ${deps[@]}; do
+    rm -rf --preserve-root $dep/.git
+done
+
+for dep in ${deps[@]}; do
+    git add -f $dep
+done
+
+git commit --amend --no-edit