Refactored SkColorSpace and added in a Lab PCS GM

tests/CodecTest.cpp

Index: tests/CodecTest.cpp
diff --git a/tests/CodecTest.cpp b/tests/CodecTest.cpp
index 4d18c618601a3dc7580f17dc9a0542d7cb68a5b2..deda9a5a44e986b7633716eb7bd3da8ad5c3fae6 100644
--- a/tests/CodecTest.cpp
+++ b/tests/CodecTest.cpp
@@ -10,7 +10,7 @@
 #include "SkBitmap.h"
 #include "SkCodec.h"
 #include "SkCodecImageGenerator.h"
-#include "SkColorSpace_Base.h"
+#include "SkColorSpace_XYZTRC.h"
 #include "SkData.h"
 #include "SkImageEncoder.h"
 #include "SkFrontBufferedStream.h"
@@ -1192,7 +1192,9 @@ static void test_conversion_possible(skiatest::Reporter* r, const char* path,
         REPORTER_ASSERT(r, SkCodec::kUnimplemented == result);
     }
 
-    infoF16 = infoF16.makeColorSpace(as_CSB(infoF16.colorSpace())->makeLinearGamma());
+    SkASSERT(as_CSB(infoF16.colorSpace())->toXYZD50());
+    SkColorSpace_XYZTRC* csXYZ = static_cast<SkColorSpace_XYZTRC*>(infoF16.colorSpace());
+    infoF16 = infoF16.makeColorSpace(csXYZ->makeLinearGamma());
     result = codec->getPixels(infoF16, bm.getPixels(), bm.rowBytes());
     REPORTER_ASSERT(r, SkCodec::kSuccess == result);
     result = codec->startScanlineDecode(infoF16);