Revert "remvoe duplicate impl for SkImageInfo flattening"

src/gpu/SkGr.cpp

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkGr.h"
 #include "SkConfig8888.h"
 #include "SkMessageBus.h"
@@ skipping 240 matching lines @@
             return kRGB_565_GrPixelConfig;
         case SkBitmap::kARGB_4444_Config:
             return kRGBA_4444_GrPixelConfig;
         case SkBitmap::kARGB_8888_Config:
             return kSkia8888_GrPixelConfig;
         default:
             // kNo_Config, kA1_Config missing
             return kUnknown_GrPixelConfig;
     }
 }
-
-bool GrPixelConfig2ColorType(GrPixelConfig config, SkColorType* ctOut) {
-    SkColorType ct;
-    switch (config) {
-        case kAlpha_8_GrPixelConfig:
-            ct = kAlpha_8_SkColorType;
-            break;
-        case kIndex_8_GrPixelConfig:
-            ct = kIndex_8_SkColorType;
-            break;
-        case kRGB_565_GrPixelConfig:
-            ct = kRGB_565_SkColorType;
-            break;
-        case kRGBA_4444_GrPixelConfig:
-            ct = kARGB_4444_SkColorType;
-            break;
-        case kRGBA_8888_GrPixelConfig:
-            ct = kRGBA_8888_SkColorType;
-            break;
-        case kBGRA_8888_GrPixelConfig:
-            ct = kBGRA_8888_SkColorType;
-            break;
-        default:
-            return false;
-    }
-    if (ctOut) {
-        *ctOut = ct;
-    }
-    return true;
-}