Add DPI stettings to SkDocument::CreatePDF(). Tests will be added in a future cl, once DPI will be …

include/pdf/SkPDFDevice.h

Index: include/pdf/SkPDFDevice.h
diff --git a/include/pdf/SkPDFDevice.h b/include/pdf/SkPDFDevice.h
index d668be5df38a05ff0be5ee25670b78dfb6cc7877..5826c27103a28b34c153e6871e3be9d8e5bc28ef 100644
--- a/include/pdf/SkPDFDevice.h
+++ b/include/pdf/SkPDFDevice.h
@@ -197,6 +197,10 @@ protected:
 
     virtual bool allowImageFilter(SkImageFilter*) SK_OVERRIDE;
 
+    void setRasterDpi(SkScalar dpi) {
+        fDpi = dpi;
+    }
+
 private:
     // TODO(vandebo): push most of SkPDFDevice's state into a core object in
     // order to get the right access levels without using friend.
@@ -233,6 +237,7 @@ private:
     SkAutoTDelete<SkPDFGlyphSetMap> fFontGlyphUsage;
 
     SkPicture::EncodeBitmap fEncoder;
+    SkScalar fDpi;
 
     SkPDFDevice(const SkISize& layerSize, const SkClipStack& existingClipStack,
                 const SkRegion& existingClipRegion);