fix skia unit tests

core/fxge/skia/fx_skia_device.h

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CORE_FXGE_SKIA_FX_SKIA_DEVICE_H_
 #define CORE_FXGE_SKIA_FX_SKIA_DEVICE_H_
 
 #if defined(_SKIA_SUPPORT_)
 
 #include "core/fxge/include/ifx_renderdevicedriver.h"
@@ skipping 108 matching lines @@
                       FX_BOOL bAlphaMode) override;
 
   virtual uint8_t* GetBuffer() const;
 
   void PaintStroke(SkPaint* spaint,
                    const CFX_GraphStateData* pGraphState,
                    const SkMatrix& matrix);
   void Flush();
   SkPictureRecorder* GetRecorder() const { return m_pRecorder; }
   void PreMultiply();
+  static void PreMultiply(CFX_DIBitmap* pDIBitmap);

[Lei Zhang, 2016/06/29 18:19:23]

Can we just remove this and put PreMultiply in fx_skia_device.cpp in an
anonymous namespace?

   SkCanvas* SkiaCanvas() { return m_pCanvas; }
   void Dump() const;
 
  private:
   friend class SkiaState;
 
   CFX_DIBitmap* m_pBitmap;
   CFX_DIBitmap* m_pOriDevice;
   SkCanvas* m_pCanvas;
   SkPictureRecorder* const m_pRecorder;
   std::unique_ptr<SkiaState> m_pCache;
   FX_BOOL m_bRgbByteOrder;
   FX_BOOL m_bGroupKnockout;
 };
 #endif  // defined(_SKIA_SUPPORT_)
 
 #endif  // CORE_FXGE_SKIA_FX_SKIA_DEVICE_H_