Printing selection from context menu.

chrome/renderer/printing/print_web_view_helper.h

Index: chrome/renderer/printing/print_web_view_helper.h
diff --git a/chrome/renderer/printing/print_web_view_helper.h b/chrome/renderer/printing/print_web_view_helper.h
index 7ba6cc852e2d17fa05ef8280579dfa4d1fa43828..f7ae14600b4db1617a889a9669dea0ade5b3a121 100644
--- a/chrome/renderer/printing/print_web_view_helper.h
+++ b/chrome/renderer/printing/print_web_view_helper.h
@@ -84,6 +84,7 @@ class PrintWebViewHelper
 
   enum PrintPreviewRequestType {
     PRINT_PREVIEW_USER_INITIATED_ENTIRE_FRAME,
+    PRINT_PREVIEW_USER_INITIATED_SELECTION,
     PRINT_PREVIEW_USER_INITIATED_CONTEXT_NODE,
     PRINT_PREVIEW_SCRIPTED  // triggered by window.print().
   };
@@ -133,7 +134,7 @@ class PrintWebViewHelper
       const PrintMsg_Print_Params& params);
 
   // Initiate print preview.
-  void OnInitiatePrintPreview();
+  void OnInitiatePrintPreview(bool selection_only);
 
   // Start the process of generating a print preview using |settings|.
   void OnPrintPreview(const base::DictionaryValue& settings);