native_client_sdk/src/build_tools/screenshot_extension/background.js

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 function takeScreenshot(onScreenshot) {
   6   console.log('Taking screenshot.');
   7   chrome.tabs.captureVisibleTab(null, {format: 'png'}, function(img) {
   8     console.log('Got screenshot, returning...');
   9     onScreenshot(img);
  10   });
  11 }
  12
  13 chrome.tabs.onUpdated.addListener(function(tabId, changeInfo, tab) {
  14   if (changeInfo.status != 'complete')
  15     return;
  16
  17   chrome.tabs.executeScript(tabId,
  18                             {file: 'injected.js', runAt: 'document_start'});
  19 });
  20
  21 chrome.runtime.onMessage.addListener(
  22     function(request, sender, sendResponse) {
  23       takeScreenshot(sendResponse);
  24
  25       // Keep the sendResponse channel open, so a response can be sent
  26       // asynchronously.
  27       return true;
  28     });