Add PQ, HLG SkTransferFns and BT.2020 YUV to gfx::ColorSpace.

Skia added support for these recently, so lets expose them in
gfx::ColorSpace. This will allow us to correct our YUV conversions for
BT.2020 content in GpuMemoryBuffer upload and PaintCanvasVideoRenderer.

BUG=960620
TEST=unittests pass
R=ccameron

Change-Id: I6a659de0da7f21070857b855796d65bdce227a2b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1894770
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Auto-Submit: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: ccameron <ccameron@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711964}

ui/gfx/color_space.cc

@@ -66,14 +66,29 @@ ColorSpace::ColorSpace(const SkColorSpace& sk_color_space)
                  TransferID::INVALID,
                  MatrixID::RGB,
                  RangeID::FULL) {
+  // Special case the HDR transfer functions since they're not numerical
+  auto transfer_eq = [](skcms_TransferFunction x, skcms_TransferFunction y) {
+    return x.g == y.g && x.a == y.a && x.b == y.b && x.c == y.c && x.d == y.d &&
+           x.e == y.e && x.f == y.f;
+  };
+
   skcms_TransferFunction fn;
+  if (sk_color_space.isNumericalTransferFn(&fn)) {
+    SetCustomTransferFunction(fn);
+  } else if (transfer_eq(fn, SkNamedTransferFn::kHLG)) {
+    transfer_ = TransferID::ARIB_STD_B67;
+  } else if (transfer_eq(fn, SkNamedTransferFn::kPQ)) {
+    transfer_ = TransferID::SMPTEST2084;
+  } else {
+    // Construct an invalid result: Unable to extract necessary parameters
+    return;
+  }
+
   skcms_Matrix3x3 to_XYZD50;
-  if (!sk_color_space.isNumericalTransferFn(&fn) ||
-      !sk_color_space.toXYZD50(&to_XYZD50)) {
+  if (!sk_color_space.toXYZD50(&to_XYZD50)) {
     // Construct an invalid result: Unable to extract necessary parameters
     return;
   }
-  SetCustomTransferFunction(fn);
   SetCustomPrimaries(to_XYZD50);
 }
 
@@ -460,6 +475,12 @@ sk_sp<SkColorSpace> ColorSpace::ToSkColorSpace() const {
     case TransferID::LINEAR_HDR:
       transfer_fn = SkNamedTransferFn::kLinear;
       break;
+    case TransferID::ARIB_STD_B67:
+      transfer_fn = SkNamedTransferFn::kHLG;
+      break;
+    case TransferID::SMPTEST2084:
+      transfer_fn = SkNamedTransferFn::kPQ;
+      break;
     default:
       if (!GetTransferFunction(&transfer_fn)) {
         DLOG(ERROR) << "Failed to transfer function for SkColorSpace";
@@ -939,6 +960,10 @@ bool ColorSpace::ToSkYUVColorSpace(SkYUVColorSpace* out) const {
       *out = kRec601_SkYUVColorSpace;
       return true;
 
+    case MatrixID::BT2020_NCL:
+      *out = kBT2020_SkYUVColorSpace;
+      return true;
+
     default:
       break;
   }