[JS Changes] Support NumCopies print preset

chrome/browser/resources/print_preview/print_preview.js

Index: chrome/browser/resources/print_preview/print_preview.js
diff --git a/chrome/browser/resources/print_preview/print_preview.js b/chrome/browser/resources/print_preview/print_preview.js
index 673b8d89ef191a18ce356069d2512ed1080f5780..68ac675db0055eb6dae9a08d4fac104e4f7511a9 100644
--- a/chrome/browser/resources/print_preview/print_preview.js
+++ b/chrome/browser/resources/print_preview/print_preview.js
@@ -351,6 +351,10 @@ cr.define('print_preview', function() {
           this.onDisableScaling_.bind(this));
       this.tracker.add(
           this.nativeLayer_,
+          print_preview.NativeLayer.EventType.PRINT_PRESET_OPTIONS,
+          this.onPrintPresetOptionsFromDocument_.bind(this));
+      this.tracker.add(
+          this.nativeLayer_,
           print_preview.NativeLayer.EventType.PRIVET_PRINT_FAILED,
           this.onPrivetPrintFailed_.bind(this));
       this.tracker.add(
@@ -989,6 +993,24 @@ cr.define('print_preview', function() {
     },
 
     /**
+     * Called when the native layer dispatches a PRINT_PRESET_OPTIONS event. It
+     * updates the print preset options from source document.
+     * @param {event} event Contains options from source document.
+     * @private
+     */
+    onPrintPresetOptionsFromDocument_: function(event) {
+      if (event.optionsFromDocument.fitToPageEnabled) {
+        this.printTicketStore_.fitToPage.updateValue(null);
+        this.documentInfo_.updateIsScalingDisabled(true);
+      }
+
+      if (event.optionsFromDocument.copies) {

[Aleksey Shlyapnikov, 2014/11/20 18:56:56]

Check this.printTicketStore_.copies.isCapabilityAvailable() too.

What is the expected behavior sending PDF with embedded copies to 'Save to PDF'
printer?

[Nikhil, 2014/11/21 10:45:32]

NumCopies property spec doesn't say anything specific to 'Save to PDF' printer.
Please see :
http://www.adobe.com/content/dam/Adobe/en/devnet/acrobat/pdfs/PDF32000_2008.pdf

Also, I tried opening print preview dialog with 'Save to PDF' as printer, and I
don't see copies option in the dialog for both pdf and html pages. 

I think NumCopies should be ignored for 'Save to PDF' printer as we would need
only one pdf file. Please let me know WDYT.

[Aleksey Shlyapnikov, 2014/11/21 22:50:41]

I agree and that's why I suggested to add
this.printTicketStore_.copies.isCapabilityAvailable() check here.

+        this.printTicketStore_.copies.updateValue(
+          event.optionsFromDocument.copies);

[Aleksey Shlyapnikov, 2014/11/20 18:56:56]

Two more spaces indent.

[Nikhil, 2014/11/21 10:45:32]

Done.

+      }
+    },
+
+    /**
      * Called when privet printing fails.
      * @param {Event} event Event object representing the failure.
      * @private