Fix print preview clipping issues due to scaling.

printing/metafile.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PRINTING_METAFILE_H_
 #define PRINTING_METAFILE_H_
 
 #include "base/basictypes.h"
 #include "build/build_config.h"
 #include "ui/gfx/native_widget_types.h"
@@ skipping 39 matching lines @@
 
   // Initializes the metafile with the data in |src_buffer|. Returns true
   // on success.
   // Note: It should only be called from within the browser process.
   virtual bool InitFromData(const void* src_buffer, uint32 src_buffer_size) = 0;
 
   // This method calls StartPage and then returns an appropriate
   // VectorPlatformDevice implementation bound to the context created by
   // StartPage or NULL on error.
   virtual skia::PlatformDevice* StartPageForVectorCanvas(
-      const gfx::Size& page_size, const gfx::Point& content_origin,
+      const gfx::Size& page_size,
+      const gfx::Rect& content_area,
       const float& scale_factor) = 0;
 
-  // Prepares a context for rendering a new page at the specified
-  // |content_origin| with the given |page_size| and a |scale_factor| to use for
-  // the drawing. The units are in points (=1/72 in). Returns true on success.
+  // Prepares a context for rendering a new page with the given |page_size|,
+  // |content_area| and  a |scale_factor| to use for the drawing. The units are
+  // in points (=1/72 in). Returns true on success.
   virtual bool StartPage(const gfx::Size& page_size,
-                         const gfx::Point& content_origin,
+                         const gfx::Rect& content_area,
                          const float& scale_factor) = 0;
 
   // Closes the current page and destroys the context used in rendering that
   // page. The results of current page will be appended into the underlying
   // data stream. Returns true on success.
   virtual bool FinishPage() = 0;
 
   // Closes the metafile. No further rendering is allowed (the current page
   // is implicitly closed).
   virtual bool FinishDocument() = 0;
@@ skipping 64 matching lines @@
   // Saves the underlying data to the file associated with fd. This function
   // should ONLY be called after the metafile is closed.
   // Returns true if writing succeeded.
   virtual bool SaveToFD(const base::FileDescriptor& fd) const = 0;
 #endif  // if defined(OS_CHROMEOS)
 };
 
 }  // namespace printing
 
 #endif  // PRINTING_METAFILE_H_