Support print preset options for pdf document

public/web/WebPlugin.h

Index: public/web/WebPlugin.h
diff --git a/public/web/WebPlugin.h b/public/web/WebPlugin.h
index 7738d1e4c065f70e5197ff177d18b0e0aadf906b..ed0dd9b1a5f26bf5cf90961306731a5a9b3fae81 100644
--- a/public/web/WebPlugin.h
+++ b/public/web/WebPlugin.h
@@ -54,6 +54,7 @@ struct WebCompositionUnderline;
 struct WebCursorInfo;
 struct WebPluginParams;
 struct WebPrintParams;
+struct WebPrintPresetOptions;
 struct WebPoint;
 struct WebRect;
 struct WebTextInputInfo;
@@ -121,8 +122,8 @@ public:
     // Returns true if the printed content should not be scaled to
     // the printer's printable area.
     virtual bool isPrintScalingDisabled() { return false; }

[raymes, 2014/09/29 05:24:14]

Can we delete this function too...? Is it providing the same information as
what's in the struct?

[Nikhil, 2014/10/09 08:43:56]

I think it's not possible to remove this method. It is used for
PPP_Printing_Dev's function IsScalingDisabled().

Please see :
https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit...

The information is same for scaling and we have already updated PPP_Pdf
interface with a commet about it. Here :
https://codereview.chromium.org/375253002/diff/260001/ppapi/c/private/ppp_pdf.h 

-    // Returns number of copies to be printed.
-    virtual int getCopiesToPrint() { return 1; }
+    // Returns true if print preset options are updated from document.

[raymes, 2014/09/29 05:24:14]

same here.

[Nikhil, 2014/10/09 08:43:56]

Done.

+    virtual bool getPrintPresetOptionsFromDocument(WebPrintPresetOptions*) { return false; }
 
     // Sets up printing with the specified printParams. Returns the number of
     // pages to be printed at these settings.