[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..2e489804ea08d1873b98e10aa0130edaa812ac51 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/WebPrintScalingOption.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebViewClient.h"
 #include "ui/gfx/size.h"
 
@@ -62,17 +63,22 @@ class PrepareFrameAndViewForPrint {
   void FinishPrinting();
 
  private:
-  void StartPrinting(const gfx::Size& print_params);
+  void StartPrinting(const gfx::Size& canvas_size,
+                     const gfx::Rect& printable_area,
+                     const gfx::Size& paper_size);
 
   WebKit::WebFrame* frame_;
   WebKit::WebNode node_to_print_;
   WebKit::WebView* web_view_;
   gfx::Size print_canvas_size_;
+  gfx::Rect printable_area_;
+  gfx::Size paper_size_;
   gfx::Size prev_view_size_;
   gfx::Size prev_scroll_offset_;
   int dpi_;
   int expected_pages_count_;
   bool use_browser_overlays_;
+  WebKit::WebPrintScalingOption print_scaling_option_;
   bool finished_;
 
   DISALLOW_COPY_AND_ASSIGN(PrepareFrameAndViewForPrint);
@@ -160,6 +166,25 @@ 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 +225,7 @@ 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