Unifying NativeMetafile class interface (as much as possible) for Linux, Mac, Win

chrome/utility/utility_thread.cc

 // 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.
 
 #include "chrome/utility/utility_thread.h"
 
 #include <vector>
 
 #include "base/file_util.h"
 #include "base/path_service.h"
@@ skipping 247 matching lines @@
     return false;
 
   int total_page_count = 0;
   if (!get_info_proc(&buffer.front(), buffer.size(), &total_page_count, NULL))
     return false;
 
   metafile->CreateFileBackedDc(NULL, NULL, metafile_path);
   // Since we created the metafile using the screen DPI (but we actually want
   // the PDF DLL to print using the passed in render_dpi, we apply the following
   // transformation.
-  SetGraphicsMode(metafile->hdc(), GM_ADVANCED);
+  SetGraphicsMode(metafile->context(), GM_ADVANCED);
   XFORM xform = {0};
   int screen_dpi = GetDeviceCaps(GetDC(NULL), LOGPIXELSX);
   xform.eM11 = xform.eM22 =
       static_cast<float>(screen_dpi) / static_cast<float>(render_dpi);
-  ModifyWorldTransform(metafile->hdc(), &xform, MWT_LEFTMULTIPLY);
+  ModifyWorldTransform(metafile->context(), &xform, MWT_LEFTMULTIPLY);
 
   bool ret = false;
   std::vector<printing::PageRange>::const_iterator iter;
   for (iter = page_ranges.begin(); iter != page_ranges.end(); ++iter) {
     for (int page_number = iter->from; page_number <= iter->to; ++page_number) {
       if (page_number >= total_page_count)
         break;
       metafile->StartPage();
       if (render_proc(&buffer.front(), buffer.size(), page_number,
-                      metafile->hdc(), render_dpi, render_dpi,
+                      metafile->context(), render_dpi, render_dpi,
                       render_area.x(), render_area.y(), render_area.width(),
                       render_area.height(), true, false, true, true))
         if (*highest_rendered_page_number < page_number)
           *highest_rendered_page_number = page_number;
         ret = true;
-      metafile->EndPage();
+      metafile->FinishPage();
     }
   }
-  metafile->CloseDc();
+  metafile->Close();
   return ret;
 }
 #endif  // defined(OS_WIN)
 
 void UtilityThread::OnIDBKeysFromValuesAndKeyPath(
     int id,
     const std::vector<SerializedScriptValue>& serialized_script_values,
     const string16& idb_key_path) {
   std::vector<WebKit::WebSerializedScriptValue> web_values;
   ConvertVector(serialized_script_values, &web_values);
@@ skipping 38 matching lines @@
   } else {
     Send(new UtilityHostMsg_GetPrinterCapsAndDefaults_Failed(printer_name));
   }
   ReleaseProcessIfNeeded();
 }
 
 void UtilityThread::ReleaseProcessIfNeeded() {
   if (!batch_mode_)
     ChildProcess::current()->ReleaseProcess();
 }