Added Header and Footer support using Skia

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 4bae6dcff01fe2a5119c0d55d5538f119702cfd2..88a76c8fce1cf0b2fd41360f68a1a56999bf1763 100644
--- a/chrome/renderer/print_web_view_helper.h
+++ b/chrome/renderer/print_web_view_helper.h
@@ -25,6 +25,11 @@ struct PrintMsg_PrintPages_Params;
 namespace base {
 class DictionaryValue;
 }
+#if defined(USE_SKIA)
+namespace skia {
+class VectorCanvas;
+}
+#endif
 
 // 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..
@@ -76,6 +81,18 @@ typedef struct PageSizeMargins {
   double margin_left;
 } PageSizeMargins;
 
+// Given the |device| and |canvas| to draw on, prints the appropriate headers
+// and footers using strings from |header_footer_info| on to the canvas.
+#if defined(USE_SKIA)
+void PrintHeaderAndFooter(SkDevice* device,

[kmadhusu, 2011/07/26 20:27:50]

As per style guide, completely global functions should be rarely used. Can you
make this global function as a non member function in an unnamed namespace or a
static member function of PrintWebViewHelper? 

Ref:
http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml?showone=Nonmem...

[Aayush Kumar, 2011/07/28 17:28:41]

Done.

+                          skia::VectorCanvas& canvas,
+                          int page_number,
+                          int total_pages,
+                          float webkit_scale_factor,
+                          const PageSizeMargins& page_layout_in_points,
+                          const base::DictionaryValue* header_footer_info);
+#endif  // USE_SKIA
+
 // PrintWebViewHelper handles most of the printing grunt work for RenderView.
 // We plan on making print asynchronous and that will require copying the DOM
 // of the document and creating a new WebView with the contents.
@@ -196,6 +213,7 @@ class PrintWebViewHelper : public RenderViewObserver,
   void PrintPageInternal(const PrintMsg_PrintPage_Params& params,
                          const gfx::Size& canvas_size,
                          WebKit::WebFrame* frame,
+                         bool is_preview,
                          printing::Metafile* metafile);
 #else
   void PrintPageInternal(const PrintMsg_PrintPage_Params& params,
@@ -214,7 +232,8 @@ class PrintWebViewHelper : public RenderViewObserver,
 #elif defined(OS_MACOSX)
   void RenderPage(const gfx::Size& page_size, const gfx::Rect& content_area,
                   const float& scale_factor, int page_number,
-                  WebKit::WebFrame* frame, printing::Metafile* metafile);
+                  WebKit::WebFrame* frame, bool is_preview,
+                  printing::Metafile* metafile);
 #elif defined(OS_POSIX)
   bool RenderPages(const PrintMsg_PrintPages_Params& params,
                    WebKit::WebFrame* frame, WebKit::WebNode* node,
@@ -280,6 +299,10 @@ class PrintWebViewHelper : public RenderViewObserver,
 
   scoped_ptr<PrintMsg_PrintPages_Params> old_print_pages_params_;
 
+  // Contains strings generated by the browser process to be printed as headers
+  // and footers if requested by the user.
+  scoped_ptr<base::DictionaryValue> header_footer_info_;
+
   // Keeps track of the state of print preview between messages.
   class PrintPreviewContext {
    public: