Support the non-native (RGBA/BGRA) swizzle

src/codec/SkWbmpCodec.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkCodec.h"
 #include "SkCodecPriv.h"
 #include "SkColorPriv.h"
@@ skipping 14 matching lines @@
         SkPMColor* colorPtr, int* colorCount) {
     if (kIndex_8_SkColorType == colorType) {
         colorPtr[0] = SK_ColorBLACK;
         colorPtr[1] = SK_ColorWHITE;
         *colorCount = 2;
     }
 }
 
 static inline bool valid_color_type(SkColorType colorType, SkAlphaType alphaType) {
     switch (colorType) {
-        case kN32_SkColorType:
+        case kRGBA_8888_SkColorType:
+        case kBGRA_8888_SkColorType:
         case kIndex_8_SkColorType:
             return true;
         case kGray_8_SkColorType:
         case kRGB_565_SkColorType:
             return kOpaque_SkAlphaType == alphaType;
         default:
             return false;
     }
 }
 
@@ skipping 163 matching lines @@
     }
 
     // Initialize the swizzler
     fSwizzler.reset(this->initializeSwizzler(dstInfo, get_color_ptr(fColorTable.get()), options));
     SkASSERT(fSwizzler);
 
     fSrcBuffer.reset(fSrcRowBytes);
 
     return kSuccess;
 }