Gmail addon: compose draft

gmail_draft_compose_appsscript.json

{
  "oauthScopes": [
    "https://www.googleapis.com/auth/gmail.addons.current.action.compose",
    "https://www.googleapis.com/auth/gmail.addons.execute",
    "https://www.googleapis.com/auth/gmail.readonly"
  ],
  "gmail": {
    "name": "返信文作成",
    "logoUrl": "https://www.gstatic.com/images/icons/material/system/2x/bookmark_black_24dp.png",
    "contextualTriggers": [{
      "unconditional": {
      },
      "onTriggerFunction": "buildAddOn"
    }],
    "primaryColor": "#4285F4",
    "secondaryColor": "#4285F4",
    "version": "TRUSTED_TESTER_V2"
  }
}