add note about security and new subclasses

src/ports/SkGlobalInitialization_default.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "Sk1DPathEffect.h"
 #include "Sk2DPathEffect.h"
 #include "SkAlphaThresholdFilter.h"
@@ skipping 28 matching lines @@
 #include "SkOffsetImageFilter.h"
 #include "SkPaintImageFilter.h"
 #include "SkPerlinNoiseShader.h"
 #include "SkPictureImageFilter.h"
 #include "SkPixelXorXfermode.h"
 #include "SkTableColorFilter.h"
 #include "SkTestImageFilters.h"
 #include "SkTileImageFilter.h"
 #include "SkXfermodeImageFilter.h"
 
+// Security note:
+//
+// As new subclasses are added here, they should be reviewed by chrome security before they
+// support deserializing cross-process: chrome-security@google.com. SampleFilterFuzz.cpp should
+// also be amended to exercise the new subclass.
+//
+// See SkReadBuffer::isCrossProcess() and SkPicture::PictureIOSecurityPrecautionsEnabled()
+//
+
 /*
  *  None of these are strictly "required" for Skia to operate.
  *
  *  These are the bulk of our "effects" -- subclasses of various effects on SkPaint.
  *
  *  Clients should feel free to dup this file and modify it as needed. This function "InitEffects"
  *  will automatically be called before any of skia's effects are asked to be deserialized.
  */
 void SkFlattenable::PrivateInitializer::InitEffects() {
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkBitmapSourceDeserializer)
@@ skipping 49 matching lines @@
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkXfermodeImageFilter)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkMagnifierImageFilter)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkMatrixConvolutionImageFilter)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkOffsetImageFilter)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkComposeImageFilter)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkMergeImageFilter)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkColorFilterImageFilter)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkDownSampleImageFilter)
     SkLightingImageFilter::InitializeFlattenables();
 }