Remove uses of SkImageDecoder from gms

gm/copyTo4444.cpp

-/*
- * Copyright 2013 Google Inc.

[msarett, 2016/03/11 20:53:09]

Pretty sure we don't support drawing into 4444?

[scroggo, 2016/03/17 13:05:48]

We don't support *drawing* into 4444, but we do support *copying* into 4444,
which this tests.

Copying into 4444 was added for a particular use case in Chrome
(crbug.com/245774). As far as I know they are still using it, but I have not
kept up with it.

[msarett, 2016/03/17 13:53:38]

Gotcha adding this back in.

- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include "gm.h"
-
-#include "Resources.h"
-#include "SkCanvas.h"
-#include "SkImageDecoder.h"
-#include "SkOSFile.h"
-
-namespace skiagm {
-
-/**
- *  Test copying an image from 8888 to 4444.
- */
-class CopyTo4444GM : public GM {
-public:
-    CopyTo4444GM() {}
-
-protected:
-    virtual SkString onShortName() {
-        return SkString("copyTo4444");
-    }
-
-    virtual SkISize onISize() {
-        return SkISize::Make(1024, 512);
-    }
-
-    virtual void onDraw(SkCanvas* canvas) {
-        SkBitmap bm, bm4444;
-        SkString pngFilename = GetResourcePath("mandrill_512.png");
-        if (!SkImageDecoder::DecodeFile(pngFilename.c_str(), &bm, kN32_SkColorType,
-                                        SkImageDecoder::kDecodePixels_Mode)) {
-            SkDebugf("Could not decode the file. Did you forget to set the "
-                     "resourcePath?\n");
-            return;
-        }
-        canvas->drawBitmap(bm, 0, 0);
-        SkAssertResult(bm.copyTo(&bm4444, kARGB_4444_SkColorType));
-        canvas->drawBitmap(bm4444, SkIntToScalar(bm.width()), 0);
-    }
-
-private:
-    typedef GM INHERITED;
-};
-
-//////////////////////////////////////////////////////////////////////////////
-
-static GM* MyFactory(void*) { return new CopyTo4444GM; }
-static GMRegistry reg(MyFactory);
-
-}