implement readPixels and writePixels natively, w/o using the (deprecated)

tools/sk_tool_utils.cpp

Index: tools/sk_tool_utils.cpp
diff --git a/tools/sk_tool_utils.cpp b/tools/sk_tool_utils.cpp
index d13b0d81f8e2561fdd01cf1b0cae5d38a04f7b2f..3eb55554b6dc780042b49c2b2587be073e147cf4 100644
--- a/tools/sk_tool_utils.cpp
+++ b/tools/sk_tool_utils.cpp
@@ -17,37 +17,6 @@ const char* colortype_name(SkColorType ct) {
     }
 }
 
-void config8888_to_imagetypes(SkCanvas::Config8888 config, SkColorType* ct, SkAlphaType* at) {
-    switch (config) {
-        case SkCanvas::kNative_Premul_Config8888:
-            *ct = kPMColor_SkColorType;
-            *at = kPremul_SkAlphaType;
-            break;
-        case SkCanvas::kNative_Unpremul_Config8888:
-            *ct = kPMColor_SkColorType;
-            *at = kUnpremul_SkAlphaType;
-            break;
-        case SkCanvas::kBGRA_Premul_Config8888:
-            *ct = kBGRA_8888_SkColorType;
-            *at = kPremul_SkAlphaType;
-            break;
-        case SkCanvas::kBGRA_Unpremul_Config8888:
-            *ct = kBGRA_8888_SkColorType;
-            *at = kUnpremul_SkAlphaType;
-            break;
-        case SkCanvas::kRGBA_Premul_Config8888:
-            *ct = kRGBA_8888_SkColorType;
-            *at = kPremul_SkAlphaType;
-            break;
-        case SkCanvas::kRGBA_Unpremul_Config8888:
-            *ct = kRGBA_8888_SkColorType;
-            *at = kUnpremul_SkAlphaType;
-            break;
-        default:
-            SkASSERT(0);
-    }
-}
-
 void write_pixels(SkCanvas* canvas, const SkBitmap& bitmap, int x, int y,
                   SkColorType colorType, SkAlphaType alphaType) {
     SkBitmap tmp(bitmap);