Implement DPI for perspective bitmaps in PDF - we save the bitmap at the resolution requested.

include/pdf/SkPDFDevice.h

Index: include/pdf/SkPDFDevice.h
diff --git a/include/pdf/SkPDFDevice.h b/include/pdf/SkPDFDevice.h
index e68623e22f0957ac8323ea3a6a07ed21964b9d48..77036d5ed82f34b070dd39432f5e024d9d8d4ebf 100644
--- a/include/pdf/SkPDFDevice.h
+++ b/include/pdf/SkPDFDevice.h
@@ -191,11 +191,6 @@ public:
         return *(fFontGlyphUsage.get());
     }
 
-protected:
-    virtual bool onReadPixels(const SkBitmap& bitmap, int x, int y,
-                              SkCanvas::Config8888) SK_OVERRIDE;
-
-    virtual bool allowImageFilter(SkImageFilter*) SK_OVERRIDE;
 
     /**
      *  rasterDpi - the DPI at which features without native PDF support
@@ -211,6 +206,12 @@ protected:
         fRasterDpi = rasterDpi;
     }
 
+protected:
+    virtual bool onReadPixels(const SkBitmap& bitmap, int x, int y,
+                              SkCanvas::Config8888) SK_OVERRIDE;
+
+    virtual bool allowImageFilter(SkImageFilter*) SK_OVERRIDE;
+
 private:
     // TODO(vandebo): push most of SkPDFDevice's state into a core object in
     // order to get the right access levels without using friend.