gs-common: dumpstate: Rewrite dump_pixel_metrics to cpp

Test: adb bugreport
Bug: 279486693
Change-Id: Ia1611db82440e2a1a522269b363d8931b08f0fe5
Signed-off-by: Ziyi Cui <ziyic@google.com>

pixel_metrics/dump_pixel_metrics.cpp

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include <dump/pixel_dump.h>
+#include <android-base/file.h>
+
+
+int main() {
+    setbuf(stdout, NULL);
+    dumpFileContent("Long running IRQ metrics", "/sys/kernel/metrics/irq/long_irq_metrics");
+    dumpFileContent("Resume latency metrics", "/sys/kernel/metrics/resume_latency/resume_latency_metrics");
+    return 0;
+}
+