Print Preview: Hook up the print button to initiate printing without displaying a print dialog.

chrome/renderer/print_web_view_helper.h

Index: chrome/renderer/print_web_view_helper.h
diff --git a/chrome/renderer/print_web_view_helper.h b/chrome/renderer/print_web_view_helper.h
index dfe3e92e57a0d17c7c1b9bf92321819370482b80..ba1d8a6cbf26c08e73a7e3b5a6a26d715b84b495 100644
--- a/chrome/renderer/print_web_view_helper.h
+++ b/chrome/renderer/print_web_view_helper.h
@@ -85,7 +85,7 @@ class PrintWebViewHelper : public RenderViewObserver ,
 
   // Message handlers.  Public for testing.
   void OnPrintingDone(int document_cookie, bool success);
-  void OnPrintForPrintPreview();
+  void OnPrintForPrintPreview(const std::string& job_settings);
   void OnPrintPages();
   void OnPrintPreview();
   void OnPrintNodeUnderContextMenu();
@@ -116,6 +116,11 @@ class PrintWebViewHelper : public RenderViewObserver ,
   virtual void didStopLoading();
 
  private:
+  enum GetSettingsParam {
+    DEFAULT,
+    CURRENT,
+  };
+
   static void GetPageSizeAndMarginsInPoints(
       WebKit::WebFrame* frame,
       int page_index,
@@ -140,6 +145,11 @@ class PrintWebViewHelper : public RenderViewObserver ,
   // Notification when printing is done - signal teardown
   void DidFinishPrinting(bool success);
 
+  // Print the pages for print preview. Do not display the native print dialog
+  // for user settings.  Use the current print settings set by the user in
+  // preview tab.
+  void PrintForPrintPreview(WebKit::WebFrame* frame, WebKit::WebNode* node);
+
   void Print(WebKit::WebFrame* frame,
              WebKit::WebNode* node,
              bool script_initiated,
@@ -151,12 +161,20 @@ class PrintWebViewHelper : public RenderViewObserver ,
 
   // Initialize print page settings with default settings.
   bool InitPrintSettings(WebKit::WebFrame* frame,
-                         WebKit::WebNode* node);
-
-  // Get the default printer settings.
-  bool GetDefaultPrintSettings(WebKit::WebFrame* frame,
-                               WebKit::WebNode* node,
-                               ViewMsg_Print_Params* params);
+                         WebKit::WebNode* node,
+                         GetSettingsParam setting_type);
+
+  // Update the current print settings with new |job_settings|. |job_settings|
+  // is a json string which contains print job details such as printer name,
+  // number of copies, page range, etc.
+  bool UpdatePrintSettings(const std::string& job_settings);
+
+  // Get the print settings. |setting_type| determines whether we need to get
+  // current settings or default settings.
+  bool GetPrintSettings(WebKit::WebFrame* frame,
+                        WebKit::WebNode* node,
+                        GetSettingsParam setting_type,
+                        ViewMsg_Print_Params* params);
 
   // Get final print settings from the user.
   // Return false if the user cancels or on error.