[Print Preview] Modified PrepareFrameAndViewPrint class to call the new printBegin function to supp…

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 55a2e6be638d188e5fc8b1415c7fc76f5332be3a..690c1926beff48c4bbbcc6d5a5248979767973b4 100644
--- a/chrome/renderer/print_web_view_helper.h
+++ b/chrome/renderer/print_web_view_helper.h
@@ -18,6 +18,7 @@
 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebCanvas.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebFrameClient.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebNode.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebPrintParams.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebViewClient.h"
 #include "ui/gfx/size.h"
 
@@ -28,10 +29,16 @@ struct PrintMsg_PrintPages_Params;
 namespace base {
 class DictionaryValue;
 }
+
 namespace printing {
 struct PageSizeMargins;
 }
 
+namespace webkit {
+struct WebPrintScalingOption;
+struct WebRect;
+struct WebSize;
+}
 // Class that calls the Begin and End print functions on the frame and changes
 // the size of the view temporarily to support full page printing..
 // Do not serve any events in the time between construction and destruction of
@@ -55,22 +62,26 @@ class PrepareFrameAndViewForPrint {
     return use_browser_overlays_;
   }
 
-  const gfx::Size& GetPrintCanvasSize() const {
-    return print_canvas_size_;
+  gfx::Size GetPrintCanvasSize() const {
+    return gfx::Size(web_print_params_.printContentArea.width,
+                     web_print_params_.printContentArea.height);
   }
 
   void FinishPrinting();
 
  private:
-  void StartPrinting(const gfx::Size& print_params);
+  void StartPrinting(const WebKit::WebRect& canvas_area,
+                     const WebKit::WebRect& printable_area,
+                     const WebKit::WebSize& paper_size,
+                     int dpi,
+                     const WebKit::WebPrintScalingOption& print_scaling_option);
 
   WebKit::WebFrame* frame_;
   WebKit::WebNode node_to_print_;
   WebKit::WebView* web_view_;
-  gfx::Size print_canvas_size_;
+  WebKit::WebPrintParams web_print_params_;
   gfx::Size prev_view_size_;
   gfx::Size prev_scroll_offset_;
-  int dpi_;
   int expected_pages_count_;
   bool use_browser_overlays_;
   bool finished_;
@@ -160,6 +171,25 @@ class PrintWebViewHelper
   // Returns true if the current destination printer is PRINT_TO_PDF.
   bool IsPrintToPdfRequested(const base::DictionaryValue& settings);
 
+  // Returns the print scaling option to retain/scale/crop the source page size
+  // to fit the printable area of the paper.
+  //
+  // We retain the source page size when the current destination printer is
+  // SAVE_AS_PDF.
+  //
+  // We crop the source page size to fit the printable area or we print only the
+  // left top page contents when
+  // (1) Source is PDF and the user has requested not to fit to printable area
+  // via |job_settings|.
+  // (2) Source is PDF. This is the first preview request and print scaling
+  // option is disabled for initiator renderer plugin.
+  //
+  // In all other cases, we scale the source page to fit the printable area.
+  WebKit::WebPrintScalingOption GetPrintScalingOption(
+      bool source_is_html,
+      const base::DictionaryValue& settings,
+      const PrintMsg_Print_Params& params);
+
   // Initiate print preview.
   void OnInitiatePrintPreview();
 
@@ -200,7 +230,7 @@ class PrintWebViewHelper
 
   // Initialize print page settings with default settings.
   // Used only for native printing workflow.
-  bool InitPrintSettings();
+  bool InitPrintSettings(bool fit_to_paper_size);
 
   // Initialize print page settings with default settings and prepare the frame
   // for print. A new PrepareFrameAndViewForPrint is created to fulfill the
@@ -424,7 +454,7 @@ class PrintWebViewHelper
     bool generate_draft_pages() const;
     printing::PreviewMetafile* metafile();
     const PrintMsg_Print_Params& print_params() const;
-    const gfx::Size& GetPrintCanvasSize() const;
+    gfx::Size GetPrintCanvasSize() const;
     int last_error() const;
 
    private: