fix text rotation for skia

core/fxge/skia/fx_skia_device.cpp

 // 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.
 
 #if defined(_SKIA_SUPPORT_)
 #include <algorithm>
 #include <vector>
 
 #include "core/fxcodec/include/fx_codec.h"
 #include "core/fxcrt/include/fx_memory.h"
@@ skipping 119 matching lines @@
 
 SkMatrix ToSkMatrix(const CFX_Matrix& m) {
   SkMatrix skMatrix;
   skMatrix.setAll(m.a, m.b, m.e, m.c, m.d, m.f, 0, 0, 1);
   return skMatrix;
 }
 
 // use when pdf's y-axis points up insead of down
 SkMatrix ToFlippedSkMatrix(const CFX_Matrix& m) {
   SkMatrix skMatrix;
-  skMatrix.setAll(m.a, m.b, m.e, -m.c, -m.d, m.f, 0, 0, 1);
+  skMatrix.setAll(m.a, -m.b, m.e, m.c, -m.d, m.f, 0, 0, 1);
   return skMatrix;
 }
 
 SkXfermode::Mode GetSkiaBlendMode(int blend_type) {
   switch (blend_type) {
     case FXDIB_BLEND_MULTIPLY:
       return SkXfermode::kMultiply_Mode;
     case FXDIB_BLEND_SCREEN:
       return SkXfermode::kScreen_Mode;
     case FXDIB_BLEND_OVERLAY:
@@ skipping 1384 matching lines @@
       SkA32Assert(a);
       SkASSERT(r <= a);
       SkASSERT(g <= a);
       SkASSERT(b <= a);
     }
   }
 #endif
 }
 
 #endif