A better fix for scaling issue.

printing/metafile_skia_wrapper.cc

Index: printing/metafile_skia_wrapper.cc
===================================================================
--- printing/metafile_skia_wrapper.cc	(revision 135774)
+++ printing/metafile_skia_wrapper.cc	(working copy)
@@ -13,6 +13,7 @@
 namespace {
 
 const char* kMetafileKey = "CrMetafile";
+const char* kCustomScaleKey = "CrCustomScale";
 
 }  // namespace
 
@@ -38,6 +39,25 @@
   return static_cast<MetafileSkiaWrapper*>(value)->metafile_;
 }
 
+// static
+void MetafileSkiaWrapper::SetCustomScaleOnCanvas(const SkCanvas& canvas,
+                                                 double scale) {
+  SkMetaData& meta = skia::getMetaData(canvas);
+  meta.setScalar(kCustomScaleKey, SkFloatToScalar(scale));
+}
+
+// static
+bool MetafileSkiaWrapper::GetCustomScaleOnCanvas(const SkCanvas& canvas,
+                                                 double* scale) {
+  SkMetaData& meta = skia::getMetaData(canvas);
+  SkScalar value;
+  if (!meta.findScalar(kCustomScaleKey, &value))
+    return false;
+
+  *scale = SkScalarToFloat(value);
+  return true;
+}
+
 MetafileSkiaWrapper::MetafileSkiaWrapper(Metafile* metafile)
     : metafile_(metafile) {
 }