{
  "name": "API_SAMPLE",
  "manifest_version": 2,
  "version": "1.0",
  "browser_action": {
    "default_title": "EXTENTION_SAMPLE"
  },
  "background": {
    "scripts": ["background.js"]
  }
}

chrome.browserAction.onClicked.addListener(function(tab) {
  alert('Hello Chrome Extentions.');
	// chrome.tabs.sendMessage(tab.id, "Action");
});