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/SkHeifCodec.cpp b/src/codec/SkHeifCodec.cpp
index c6ce0b9..32a128b 100644
--- a/src/codec/SkHeifCodec.cpp
+++ b/src/codec/SkHeifCodec.cpp
@@ -161,8 +161,8 @@
 {}
 
 
-bool SkHeifCodec::conversionSupported(const SkImageInfo& dstInfo, SkColorType /*srcColorType*/,
-                                      bool srcIsOpaque, bool needsColorXform) {
+bool SkHeifCodec::conversionSupported(const SkImageInfo& dstInfo, bool srcIsOpaque,
+                                      bool needsColorXform) {
     SkASSERT(srcIsOpaque);
 
     if (kUnknown_SkAlphaType == dstInfo.alphaType()) {