Revert "Support decoding images to multiple formats, depending on usage"

This reverts commit c73a1ecbed64652b3d7aa8dc6face9a2205ce830.

Reason for revert: ANGLE and CommandBuffer failures

Original change's description:
> Support decoding images to multiple formats, depending on usage
> 
> Our codec generator will now preserve any asked-for color space, and
> convert the encoded data to that representation. Cacherator now
> allows decoding an image to both legacy (nullptr color space), and
> color-correct formats. In color-correct mode, we choose the best
> decoded format, based on the original properties, and our backend's
> capabilities. Preference is given to the native format, when it's
> already texturable (sRGB 8888 or F16 linear). Otherwise, we prefer
> linear F16, and fall back to sRGB when that's not an option.
> 
> BUG=skia:5907
> 
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4438
> 
> Change-Id: I847c243dcfb72d8c0f1f6fc73c09547adea933f0
> Reviewed-on: https://skia-review.googlesource.com/4438
> Reviewed-by: Matt Sarett <msarett@google.com>
> Commit-Queue: Brian Osman <brianosman@google.com>
> 

TBR=mtklein@google.com,bsalomon@google.com,msarett@google.com,brianosman@google.com,reed@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Change-Id: I1818f937464573d601f64e5a1f1eb43f5a778f4e
Reviewed-on: https://skia-review.googlesource.com/4832
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
diff --git a/tools/Resources.cpp b/tools/Resources.cpp
index 981bfba..3a9bb58 100644
--- a/tools/Resources.cpp
+++ b/tools/Resources.cpp
@@ -30,12 +30,7 @@
     SkString resourcePath = GetResourcePath(resource);
     sk_sp<SkData> resourceData(SkData::MakeFromFileName(resourcePath.c_str()));
     std::unique_ptr<SkImageGenerator> gen(SkImageGenerator::NewFromEncoded(resourceData.get()));
-    SkPMColor ctStorage[256];
-    sk_sp<SkColorTable> ctable(new SkColorTable(ctStorage, 256));
-    int count = ctable->count();
-    return dst->tryAllocPixels(gen->getInfo(), nullptr, ctable.get()) &&
-        gen->getPixels(gen->getInfo().makeColorSpace(nullptr), dst->getPixels(), dst->rowBytes(),
-                       const_cast<SkPMColor*>(ctable->readColors()), &count);
+    return gen && gen->tryGenerateBitmap(dst);
 }
 
 sk_sp<SkImage> GetResourceAsImage(const char* resource) {