SkImageEncoder: simplify API

  - Hide SkImageEncoder class in private header.
  - SkImageEncoder::Type becomes SkEncodedImageFormat
  - SkEncodedFormat becomes SkEncodedImageFormat
  - SkImageEncoder static functions replaced with
    single function EncodeImage()
  - utility wrappers for EncodeImage() are in
    sk_tool_utils.h

TODO: remove link-time registration mechanism.
TODO: clean up clients use of API and flip the flag.
TODO: implement EncodeImage() in chromeium/skia/ext

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4909

Change-Id: Ib48b31fdc05cf23cda7f56ebfd67c841c149ce70
Reviewed-on: https://skia-review.googlesource.com/4909
Reviewed-by: Mike Reed <reed@google.com>
Reviewed-by: Leon Scroggins <scroggo@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
diff --git a/samplecode/SampleSlides.cpp b/samplecode/SampleSlides.cpp
index 43221d4..c1c49b4 100644
--- a/samplecode/SampleSlides.cpp
+++ b/samplecode/SampleSlides.cpp
@@ -15,6 +15,8 @@
 #include "SkPaint.h"
 #include "SkView.h"
 
+#include "sk_tool_utils.h"
+
 #define BG_COLOR    0xFFDDDDDD
 
 typedef void (*SlideProc)(SkCanvas*);
@@ -681,7 +683,7 @@
             canvas.restore();
             SkString str;
             str.printf("/skimages/slide_" SK_SIZE_T_SPECIFIER ".png", i);
-            SkImageEncoder::EncodeFile(str.c_str(), bm, SkImageEncoder::kPNG_Type, 100);
+            sk_tool_utils::EncodeImageToFile(str.c_str(), bm, SkEncodedImageFormat::kPNG, 100);
         }
         this->setBGColor(BG_COLOR);
     }