Add media size capability to PDF printer.

chrome/browser/resources/print_preview/native_layer.js

Index: chrome/browser/resources/print_preview/native_layer.js
diff --git a/chrome/browser/resources/print_preview/native_layer.js b/chrome/browser/resources/print_preview/native_layer.js
index ea9effad41b63c012ac9edf1cb47645a5a5a9afb..077db5b67628587bef6372dd79e0c213b5e23b21 100644
--- a/chrome/browser/resources/print_preview/native_layer.js
+++ b/chrome/browser/resources/print_preview/native_layer.js
@@ -15,6 +15,7 @@ cr.define('print_preview', function() {
 
     // Bind global handlers
     global['setInitialSettings'] = this.onSetInitialSettings_.bind(this);
+    global['setPdfCapabilities'] = this.onSetPdfCapabilities_.bind(this);
     global['setUseCloudPrint'] = this.onSetUseCloudPrint_.bind(this);
     global['setPrinters'] = this.onSetPrinters_.bind(this);
     global['updateWithPrinterCapabilities'] =
@@ -44,7 +45,7 @@ cr.define('print_preview', function() {
     global['autoCancelForTesting'] = this.autoCancelForTesting_.bind(this);
     global['onPrivetPrinterChanged'] = this.onPrivetPrinterChanged_.bind(this);
     global['onPrivetCapabilitiesSet'] =
-      this.onPrivetCapabilitiesSet_.bind(this);
+        this.onPrivetCapabilitiesSet_.bind(this);
     global['onPrivetPrintFailed'] = this.onPrivetPrintFailed_.bind(this);
   };
 
@@ -68,6 +69,7 @@ cr.define('print_preview', function() {
     PAGE_COUNT_READY: 'print_preview.NativeLayer.PAGE_COUNT_READY',
     PAGE_LAYOUT_READY: 'print_preview.NativeLayer.PAGE_LAYOUT_READY',
     PAGE_PREVIEW_READY: 'print_preview.NativeLayer.PAGE_PREVIEW_READY',
+    PDF_CAPABILITIES_READY: 'print_preview.NativeLayer.PDF_CAPABILITIES_READY',
     PREVIEW_GENERATION_DONE:
         'print_preview.NativeLayer.PREVIEW_GENERATION_DONE',
     PREVIEW_GENERATION_FAIL:
@@ -124,6 +126,11 @@ cr.define('print_preview', function() {
       chrome.send('getInitialSettings');
     },
 
+    /** Requests PDF printer capabilities, such as media size. */
+    startGetPdfCapabilities: function() {
+      chrome.send('getPdfCapabilities');
+    },
+
     /**
      * Requests the system's local print destinations. A LOCAL_DESTINATIONS_SET
      * event will be dispatched in response.
@@ -405,6 +412,16 @@ cr.define('print_preview', function() {
     },
 
     /**
+     * @param {!Object} capabilities Object containing some of the PDF printer
+     *     capabilities, such as media size.
+     */
+    onSetPdfCapabilities_: function(capabilities) {
+      var event = new Event(NativeLayer.EventType.PDF_CAPABILITIES_READY);
+      event.capabilities = capabilities;
+      this.dispatchEvent(event);
+    },
+
+    /**
      * Turn on the integration of Cloud Print.
      * @param {string} cloudPrintURL The URL to use for cloud print servers.
      * @private