Support chrome.send method on internal resource pages

[jonathansampson]

Description

For chrome-app integration, we'll need to implement the chrome.send method, allowing us to issue commands like the following:

chrome.send('launchApp', [
    this.appId, APP_LAUNCH.NTP_APPS_MAXIMIZED, 'chrome-ntp-icon', e.button,
    e.altKey, e.ctrlKey, e.metaKey, e.shiftKey
]);

This method is used extensively through chrome://apps:

Relevant Chromium Source:

1. https://cs.chromium.org/chromium/src/ios/web/webui/resources/web_ui_send.js?type=cs&sq=package:chromium&l=9-12
2. https://cs.chromium.org/chromium/src/content/renderer/web_ui_extension.cc?type=cs&sq=package:chromium&l=89-129

See also Creating Chrome WebUI Interfaces for further example.

Brave Version

0.19.37

about:brave info:

Brave: 0.19.37
rev: c6ee3b2
Muon: 4.4.25
libchromiumcontent: 61.0.3163.100
V8: 6.1.534.41
Node.js: 7.9.0
Update Channel: Beta
OS Platform: Microsoft Windows
OS Release: 10.0.15063
OS Architecture: x64

Additional Information