Include AdSense for Platforms meta tag

For sites with the AdSense module active, Site Kit should include the new AdSense for Platforms meta tag (see https://developers.google.com/adsense/platforms/transparent/meta-tags). It has the following shape: <meta name="google-adsense-platform-account" content="{host-publisher-id}">

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Acceptance criteria

• When the AdSense module is active, the following meta tags should be placed in the frontend, to associate the site with Site Kit’s platform account (learn more):
  • <meta name="google-adsense-platform-account" content="ca-host-pub-2644536267352236">
  • <meta name="google-adsense-platform-domain" content="sitekit.withgoogle.com">
• This should be regardless of whether the module is connected or whether the useSnippet option is enabled.

Implementation Brief

Important: Before merging any PR for this, please confirm with @felixarntz whether the Google side infrastructure is ready to go.

In Google\Site_Kit\Modules\AdSense class,

• add the necessary platform meta tags in a new private render_platform_meta_tags method.
  • The values of the platform meta tags are exactly as they are listed in the AC, and can be hard coded.
• In the register method, add a new action for wp_head that calls the newly added render_platform_meta_tags method like render method is called in the Google\Site_Kit\Modules\AdSense\Web_Tag’s register method.

Test Coverage

• Add tests for checking existence of the meta tags when adsense module is activated (whether fully connected or not).

Visual Regression Changes

• Not needed.

QA Brief

• Activate Adsense module.
• Check for the existence platform tags from the AC in AMP and Non-AMP version of the website when the module is not fully connected.
• Do the same for module fully connected state as well.

Changelog entry

• Add AdSense for Platforms meta tag

[felixarntz]

@eclarke1 @aaemnnosttv It’s now confirmed that this can go out in 1.43.0 as planned - so we don’t need to create another issue to comment out that code. 👍

[aaemnnosttv]

Great, thanks @kuasha420 !

IB ✅