Reduce delay when showing feedback.

chrome/browser/resources/feedback/js/feedback.js

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /** @type {string}
  * @const
  */
 var FEEDBACK_LANDING_PAGE =
     'https://www.google.com/support/chrome/go/feedback_confirmation';
 /** @type {number}
@@ skipping 217 matching lines @@
   // Add listener to receive the feedback info object.
   chrome.runtime.onMessage.addListener(function(request, sender, sendResponse) {
     if (request.sentFromEventPage) {
       // TODO(rkc):  Remove logging once crbug.com/284662 is closed.
       console.log('FEEDBACK_DEBUG: Received feedbackInfo.');
       feedbackInfo = request.data;
       $('description-text').textContent = feedbackInfo.description;
       if (feedbackInfo.pageUrl)
         $('page-url-text').value = feedbackInfo.pageUrl;
 
-      takeScreenshot(function(screenshotDataUrl) {
+      takeScreenshot(function(screenshotCanvas) {
+        // TODO(rkc):  Remove logging once crbug.com/284662 is closed.
+        console.log('FEEDBACK_DEBUG: Taken screenshot. Showing window.');
+
+        // We've taken our screenshot, show the feedback page without any
+        // further delay.
+        resizeAppWindow();
+        chrome.app.window.current().show();
+
+        var screenshotDataUrl = screenshotCanvas.toDataURL('image/png');
         $('screenshot-image').src = screenshotDataUrl;
         feedbackInfo.screenshot = dataUrlToBlob(screenshotDataUrl);
-        // TODO(rkc):  Remove logging once crbug.com/284662 is closed.
-        console.log('FEEDBACK_DEBUG: Taken screenshot. Showing window.');
-        resizeAppWindow();
-        chrome.app.window.current().show();
       });
 
       chrome.feedbackPrivate.getUserEmail(function(email) {
         $('user-email-text').value = email;
       });
 
       chrome.feedbackPrivate.getSystemInformation(function(sysInfo) {
         systemInfo = sysInfo;
       });
 
@@ skipping 42 matching lines @@
       if (windowId == systemInfoWindowId)
         systemInfoWindowId = 0;
     });
     if ($('sysinfo-url')) {
       $('sysinfo-url').onclick = openSystemInfoWindow;
     }
   });
 }
 
 initialize();