Add cuj_chargerate subattributes to cuj

This subattribute will be used to run suites for ChargeRateCUJ.

BUG=b:490992256
TEST=~/chromiumos/src/platform/tast/fast_build.sh -T

Change-Id: I0c37d5a868a9af29ad59e9e7dede3ab0abb39e88
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/tast/+/7640641
Tested-by: Mars Huang <mars.huang@cienet.com>
Reviewed-by: See Wai Fu <seewaifu@google.com>
Reviewed-by: Vincent Chiang <vincentchiang@chromium.org>
Reviewed-by: Jane Yang (xWF) <chicheny@google.com>
Commit-Queue: Mars Huang <mars.huang@cienet.com>
Reviewed-by: Jason Hsiao (xWF) <jasonhsiao@google.com>

src/go.chromium.org/tast/core/internal/testing/attr.go

diff --git a/src/go.chromium.org/tast/core/internal/testing/attr.go b/src/go.chromium.org/tast/core/internal/testing/attr.go
index b6c4c65..a73bfa2 100644
--- a/src/go.chromium.org/tast/core/internal/testing/attr.go
+++ b/src/go.chromium.org/tast/core/internal/testing/attr.go
@@ -680,6 +680,10 @@
 				Name: "cuj_loginperf",
 				Desc: `LoginPerf.* that run regularly`,
 			},
+			{
+				Name: "cuj_chargerate",
+				Desc: `ChargeRateCUJ that run regularly`,
+			},
 		},
 	},
 	{

src/go.chromium.org/tast/core/internal/testing/attr_test.go

diff --git a/src/go.chromium.org/tast/core/internal/testing/attr_test.go b/src/go.chromium.org/tast/core/internal/testing/attr_test.go
index ba815eb..d140a86 100644
--- a/src/go.chromium.org/tast/core/internal/testing/attr_test.go
+++ b/src/go.chromium.org/tast/core/internal/testing/attr_test.go
@@ -224,6 +224,9 @@
 			attrs: []string{"group:cuj", "cuj_loginperf"},
 		},
 		{
+			attrs: []string{"group:cuj", "cuj_chargerate"},
+		},
+		{
 			attrs: []string{"group:healthd", "healthd_perbuild"},
 		},
 		{