Remove SkCodec::fSrcInfo

This object is now redundant with fEncodedInfo. It holds an
SkColorSpace, which is never used now that SkCodec uses skcms.

SkCodec::getInfo() no longer returns a reference, but creates an
SkImageInfo from the SkEncodedInfo the same way fSrcInfo was
previously created.

Add SkCodec::bounds() and ::dimensions() to replace calling these
methods on getInfo().

Remove srcInfo from SkMaskSwizzler::Create, which just wants to know
whether the src is opaque.

Remove the srcColorType from conversionSupported. Only the base class
version used it. Make it look at fEncodedInfo.color() instead.

Bug: skia:6839
Bug: chromium:887372
Change-Id: I2c0583cae76121211c1a6b49979972fa86daf077
Reviewed-on: https://skia-review.googlesource.com/c/157563
Commit-Queue: Leon Scroggins <scroggo@google.com>
Reviewed-by: Mike Reed <reed@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
diff --git a/src/codec/SkWbmpCodec.h b/src/codec/SkWbmpCodec.h
index b9df0b9..6e72763 100644
--- a/src/codec/SkWbmpCodec.h
+++ b/src/codec/SkWbmpCodec.h
@@ -28,8 +28,8 @@
     Result onGetPixels(const SkImageInfo&, void*, size_t,
                        const Options&, int*) override;
     bool onRewind() override;
-    bool conversionSupported(const SkImageInfo& dst, SkColorType srcColor,
-                             bool srcIsOpaque, bool needsXform) override;
+    bool conversionSupported(const SkImageInfo& dst, bool srcIsOpaque,
+                             bool needsXform) override;
     // No need to Xform; all pixels are either black or white.
     bool usesColorXform() const override { return false; }
 private: