How to get/switch context when using Ruby + Appium + Android Chrome browser

Most if not all examples I read here are about an native or hybrid app and how to switch between context to be able to interact with the elements.
I’m using Chrome and a website.
So my first question is, does this automatically start in the webview context?
Q2; Do I need to switch to the webview to be able to interact?
Q3: Is there a page that explains this scenario (ruby + appium + android chrome webpage + context)?

I was not able to find what I needed so far.
What I did:

require 'appium_lib'
capabilities = {
    deviceName:        'Nexus5',
    browserName:	   'chrome',
    platformName:      :android,
    newCommandTimeout: 15000,
}
browser = Appium::Driver.new(caps: capabilities).start_driver
browser.get("https://www.google.nl")

So far so good, chrome starts and I can navigate to a url.
I can even find elements by ID:

irb(main):045:0>   e = browser.find_element(:id, 'lst-ib')
=> #<Selenium::WebDriver::Element:0x..f926f926a id="0.9853208960371109-1">

However I cannot perform a tap/press on this element (or on random x,y coordinates) - see https://discuss.appium.io/t/ruby-appium-touchaction-perform-returns-error-method-has-not-yet-been-implemented/18308

Which leaves me thinking I might need to figure out what context I’m trying to perform these actions on.
However, This failed:

irb(main):050:0> browser.contexts = available_contexts
NameError: undefined local variable or method `available_contexts' for main:Object
        from (irb):50
        from C:/Ruby23/bin/irb.cmd:19:in `<main>'
irb(main):051:0> contexts = available_contexts
NameError: undefined local variable or method `available_contexts' for main:Object
        from (irb):51
        from C:/Ruby23/bin/irb.cmd:19:in `<main>'

So what Am I doing wrong here?

As @KazuCocoa mentioned in the other post, I Needed to do
browser.available_contexts

irb(main):010:0> browser.available_contexts
=> ["NATIVE_APP", "CHROMIUM"]