Creates GCP promo for ChromeOS users with no cloud printers.

chrome/browser/resources/print_preview/previewarea/preview_area.js

Index: chrome/browser/resources/print_preview/previewarea/preview_area.js
diff --git a/chrome/browser/resources/print_preview/previewarea/preview_area.js b/chrome/browser/resources/print_preview/previewarea/preview_area.js
index 8e996703475ac79f9c8819307fb008847e10409c..102b026f8a6beb2932c72f1b25071e078f1a468f 100644
--- a/chrome/browser/resources/print_preview/previewarea/preview_area.js
+++ b/chrome/browser/resources/print_preview/previewarea/preview_area.js
@@ -150,8 +150,7 @@ cr.define('print_preview', function() {
     OPEN_SYSTEM_DIALOG_BUTTON: 'preview-area-open-system-dialog-button',
     OPEN_SYSTEM_DIALOG_BUTTON_THROBBER:
         'preview-area-open-system-dialog-button-throbber',
-    OVERLAY: 'preview-area-overlay-layer',
-    PDF_PLUGIN: 'preview-area-pdf-plugin'

[ydolgov1, 2012/10/16 21:44:54]

Not sure I understand why you removed this class from the enum and started to
use string instead?

[Toscano, 2012/10/16 22:24:14]

This class was no longer used. So I removed it. But I'd like to get rid of these
Classes_ enums and migrate to just using concise strings.

+    OVERLAY: 'preview-area-overlay-layer'
   };
 
   /**
@@ -418,7 +417,8 @@ cr.define('print_preview', function() {
       this.plugin_.setAttribute('src', srcUrl);
       this.plugin_.setAttribute('aria-live', 'polite');
       this.plugin_.setAttribute('aria-atomic', 'true');
-      this.getElement().appendChild(this.plugin_);
+      this.getChildElement('.preview-area-plugin-wrapper').

[ydolgov1, 2012/10/16 22:43:17]

Do you have any rule when you use getChildElement and when you use
getElementsByClassName?

[Toscano, 2012/10/16 22:58:44]

Yes. Always use getChildElement. I want to move away from the
getElementsByClassName method. Some classes have not yet been migrated.

+          appendChild(this.plugin_);
 
       global['onPreviewPluginLoad'] = this.onPluginLoad_.bind(this);
       this.plugin_.onload('onPreviewPluginLoad()');