Reverting r12665 & r12666 (Remove duplicate impl for SkImageInfo flattening) due to Chromium/Blink …

src/gpu/SkGr.cpp

Index: src/gpu/SkGr.cpp
===================================================================
--- src/gpu/SkGr.cpp	(revision 12666)
+++ src/gpu/SkGr.cpp	(working copy)
@@ -258,33 +258,3 @@
             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;
-}