Add LayoutTests for SignedHTTPExchange

These tests are using SetSignedExchangeVerificationTime() Mojo API which are
introduced by crrev.com/c/991833

Bug: 827939
Change-Id: I142220f881fdca2ff22ca742a3e5e61a6f1e1966
Reviewed-on: https://chromium-review.googlesource.com/991627
Commit-Queue: Tsuyoshi Horo <[email protected]>
Reviewed-by: Kent Tamura <[email protected]>
Reviewed-by: Kouhei Ueno <[email protected]>
Reviewed-by: Kunihiko Sakamoto <[email protected]>
Reviewed-by: Kinuko Yasuda <[email protected]>
Cr-Commit-Position: refs/heads/master@{#549048}
diff --git a/third_party/WebKit/LayoutTests/VirtualTestSuites b/third_party/WebKit/LayoutTests/VirtualTestSuites
index e223503..03d0fa84 100644
--- a/third_party/WebKit/LayoutTests/VirtualTestSuites
+++ b/third_party/WebKit/LayoutTests/VirtualTestSuites
@@ -635,6 +635,16 @@
     "args": ["--enable-features=NavigationMojoResponse"]
   },
   {
+    "prefix": "htxg",
+    "base": "http/tests/loading/htxg",
+    "args": ["--enable-features=SignedHTTPExchange"]
+  },
+  {
+    "prefix": "htxg-with-network-service",
+    "base": "http/tests/loading/htxg",
+    "args": ["--enable-features=SignedHTTPExchange,NetworkService"]
+  },
+  {
     "prefix": "picture-in-picture",
     "base": "external/wpt/picture-in-picture",
     "args": ["--enable-features=PictureInPicture,UseSurfaceLayerForVideo"]