Tunnel the CDD from the Print Preview javascript to the privet operation

printing/print_job_constants.cc

 // Copyright (c) 2012 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.
 
 #include "printing/print_job_constants.h"
 
 namespace printing {
 
 // True if this is the first preview request.
 const char kIsFirstRequest[] = "isFirstRequest";
 
 // Unique ID sent along every preview request.
 const char kPreviewRequestID[] = "requestID";
 
 // Unique ID to identify a print preview UI.
 const char kPreviewUIID[] = "previewUIID";
 
+// Capabilities option. Contains the capabilities in CDD format.
+const char kSettingCapabilities[] = "capabilities";
+
 // Print using cloud print: true if selected, false if not.
 const char kSettingCloudPrintId[] = "cloudPrintID";
 
 // Print using cloud print dialog: true if selected, false if not.
 const char kSettingCloudPrintDialog[] = "printWithCloudPrint";
 
 // Print job setting 'collate'.
 const char kSettingCollate[] = "collate";
 
 // Print out color: true for color, false for grayscale.
@@ skipping 127 matching lines @@
 const char kGreyscale[] = "Greyscale";
 const char kMonochrome[] = "Monochrome";
 const char kNormal[] = "Normal";
 const char kNormalGray[] = "Normal.Gray";
 const char kRGB[] = "RGB";
 const char kRGBA[] = "RGBA";
 const char kRGB16[] = "RGB16";
 #endif
 
 }  // namespace printing