Access atrace HAL to get available categories

This code is not used yet. It is just the wrapper layers
to allow traced probes to talk to the atrace HAL.

Bug: 127378737
Test: Code is never reached for now

Change-Id: I062d29ec5ba7dd54c8c7f4ea6efaa3d3b854aee0
diff --git a/src/android_internal/BUILD.gn b/src/android_internal/BUILD.gn
index baf21a6..36734fd 100644
--- a/src/android_internal/BUILD.gn
+++ b/src/android_internal/BUILD.gn
@@ -19,6 +19,7 @@
     "../../gn:default_deps",
   ]
   sources = [
+    "atrace_hal.h",
     "health_hal.h",
     "power_stats_hal.h",
   ]
@@ -34,12 +35,14 @@
   ]
   if (perfetto_build_with_android) {
     sources = [
+      "atrace_hal.cc",
       "health_hal.cc",
       "power_stats_hal.cc",
     ]
     libs = [
       "android.hardware.health@2.0",
       "android.hardware.power.stats@1.0",
+      "android.hardware.atrace@1.0",
       "base",
       "log",
       "hidlbase",