Headless chrome creation script and readme file (#229)

* Headless chrome creation script and readme file

* Rename README_chrome_headless.md to README.md

* Add README.md

* add comments on how to run chrome to get pdf and png report

* Change test web from google.com to https://opendistro.github.io/for-elasticsearch

kibana-reports/rendering-engine/headless-chrome/README.md

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+## Chrome Binaries for Kibana Reports used by Puppeteer
+Headless Chrome for Linux and Mac are chrome binaries which are significantly smaller than the standard binaries shipped by Google and Puppeteer. 
+Chrome binary can be built from shell script build_headless_chrome.sh for Mac, Linux x64 and Linux arm64, 
+output of script is called headless_shell.
+
+## Puppeteer's Chrome version
+
+Find the puppeteer version used in Kibana node_modules.json and get the associated chrome SHA to build from crrev.com and puppeteer repositories. Puppeteer 1.9 uses rev 674921 with commit sha as 312d84c8ce62810976feda0d3457108a6dfff9e6)
+
+## headless Chrome folder structure
+-chromium
+ |-chromium
+   |-chromium
+     |-src
+       |-out
+         |-headless
+           |-headless_shell     # output of scripts
+
+## How to generate the headless_chrome
+This is a shell script to set environment variable, download the source code and build the executable.
+
+## Commands to create headless_chrome
+Run below command to create headless_shell for each platform
+
+headless-chrome.sh chrome-version-SHA (arch_name (arm64))
+. Mac x64: ./build_headless_chrome.sh <chrome-version-SHA>
+. Linux x64: ./build_headless_chrome.sh <chrome-version-SHA>
+. Linux arm64: ./build_headless_chrome.sh <chrome-version-SHA> arm64
+
+# How to call in Command line:
+. PNG report: ./headless_shell --headless --disable-gpu --screenshot=test.png https://opendistro.github.io/for-elasticsearch
+. PDF report: ./headless_shell --headless --disable-gpu --print-to-pdf=test.pdf https://opendistro.github.io/for-elasticsearch
+
+## Headless Chromium for MAC
+# Files:
+    headless_shell
+    libswiftshader_libGLESv2.dylib
+
+## Headless Chromium for Linux (arm64 and x64)
+# Files:
+    headless_shell
+    swiftshader
+      |-libEGL.so
+      |-libEGL.so.TOC
+      |-libGLESv2.so
+      |-libGLESv2.so.TOC
+# Additional libaries:
+  libnss3-dev
+  fonts-liberation
+  libfontconfig
+  (installation command example : sudo apt update && apt install libnss3-dev fonts-liberation libfontconfig)
+

kibana-reports/rendering-engine/headless-chrome/build_headless_chrome.sh

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+#!/bin/bash
+
+# Initializes a Linux environment. This need only be done once per
+# machine. The OS needs to be a flavor that supports apt get, such as Ubuntu.
+
+function generateArgs {
+if [ $1 == 'linux' ];  then
+  echo 'import("//build/args/headless.gn")
+is_component_build = false
+remove_webcore_debug_symbols = true
+enable_nacl = false
+is_debug = false
+symbol_level = 0
+use_kerberos = false' > args.gn
+elif [ $1 == 'darwin' ]; then
+  echo '#args configuration
+
+icu_use_data_file = false
+v8_use_external_startup_data = false
+remove_webcore_debug_symbols = true
+use_kerberos = false
+use_libpci = false
+use_pulseaudio = false
+use_udev = false
+is_debug = false
+symbol_level = 0
+is_component_build = false
+enable_nacl = false
+enable_print_preview = false
+enable_basic_printing = false
+enable_remoting = false
+use_alsa = false
+use_cups = false
+use_dbus = false
+use_gio = false
+' > args.gn
+fi
+}
+
+ARGC=("$#")
+
+if [ $ARGC -lt 1 ];
+then
+   echo "format: build_headless_chrome.sh {chrome_source_version} (arch_name)"
+   echo "Mac x64: ./build_headless_chrome.sh  312d84c8ce62810976feda0d3457108a6dfff9e6"
+   echo "Linux x64: ./build_headless_chrome.sh 312d84c8ce62810976feda0d3457108a6dfff9e6"
+   echo "Linux arm64: ./build_headless_chrome.sh 312d84c8ce62810976feda0d3457108a6dfff9e6 arm64"
+   exit
+fi
+
+source_version=$1
+
+if [ $ARGC -lt 2 ];
+then
+   arch_name="x64"
+else
+  arch_name=$2
+fi
+
+if ! [ -x "$(command -v python)" ]; then
+  echo "Python is not found, please install python or setup python environment properly"
+  exit
+fi
+
+# Launch the cross-platform init script using a relative path
+# from this script's location.
+mkdir -p ~/chromium
+
+if [ "$#" -eq 2 ]; then
+  arch_name=$2
+fi
+
+current_folder=$(pwd)
+
+# find the current platform
+platform_name='unknown'
+if [[ "$OSTYPE" == "linux-gnu"* ]]; then
+  platform_name='linux'
+elif [[ "$OSTYPE" == "darwin"* ]]; then
+  platform_name='darwin'
+elif [[ "$OSTYPE" == "win32" ]]; then
+  platform_name='windows'
+fi
+
+if [[ "$platform_name" == "unknown" ]]; then
+  echo "platform is"  $platform_name
+  exit
+fi
+
+echo "source_version = " $source_version
+echo "platform_name = " $platform_name
+echo "arch_name = " $arch_name
+generateArgs $platform_name
+
+# Configure git
+git config --global core.autocrlf false
+git config --global core.filemode false
+git config --global branch.autosetuprebase always
+cd chromium
+
+# Grab Chromium's custom build tools, if they aren't already installed
+# (On Windows, they are installed before this Python script is run)
+if ! [ -d "depot_tools" ]
+then
+  git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
+fi
+
+# Put depot_tools on the path so we can properly run the fetch command
+export PATH="$PATH:${HOME}/chromium/depot_tools"
+echo ${HOME}/chromium/depot_tools
+
+# Fetch the Chromium source code
+
+if [ -d 'chromium' ]; then
+  echo "chromium src aready exists, please delete it and retry..."
+  exit
+fi
+
+mkdir -p chromium
+cd chromium
+pwd
+
+# Build Linux deps
+echo "fetching chromium..."
+fetch chromium
+
+
+# Build Linux deps
+
+cd src 
+if [[ arch_name -eq "arm64" ]]; then
+  ./build/linux/sysroot_scripts/install-sysroot.py --arch=$arch_name
+fi
+
+if [[ platform_name -eq "linux" ]]; then
+  ./build/install-build-deps.sh
+fi
+
+
+# Set to "arm" to build for ARM on Linux
+echo 'Building Chromium '  $source_version  ' for '  $arch_name
+
+# Sync the codebase to the correct version, syncing master first
+# to ensure that we actually have all the versions we may refer to
+echo 'Syncing source code'
+
+
+git checkout -f master
+git fetch -f origin
+gclient sync --with_branch_heads --with_tags --jobs 16
+git checkout $source_version
+gclient sync --with_branch_heads --with_tags --jobs 16
+gclient runhooks
+echo "current_folder :" $current_folder
+
+platform_build_args=$current_folder'/args.gn'
+#platform_build_args=$current_folder/chromium/build_chromium/$platform_name/args.gn
+
+outputDir='headless'
+mkdir -p 'out/headless'
+
+echo "platform_build_args :" $platform_build_args
+
+cp $platform_build_args 'out/headless/args.gn'
+echo "platform_build_args :" $platform_build_args
+echo 'target_cpu = '\"$arch_name\"  >> 'out/headless/args.gn'
+
+gn gen out/headless
+
+autoninja -C out/headless headless_shell
+
+if [[ ($platform_name != "Windows" && $arch_name != 'arm64')  ]]; then
+  echo 'Optimizing headless_shell'
+  mv out/headless/headless_shell out/headless/headless_shell_raw
+  strip -o out/headless/headless_shell out/headless/headless_shell_raw
+fi