profiling: clean up /proc/<pid>/cmdline parsing.

Change-Id: If373598cc7d62a59414401e902676f3686492a6b
diff --git a/Android.bp b/Android.bp
index 3968ef0..05e4b06 100644
--- a/Android.bp
+++ b/Android.bp
@@ -57,6 +57,7 @@
     "src/profiling/memory/bookkeeping.cc",
     "src/profiling/memory/heapprofd_producer.cc",
     "src/profiling/memory/main.cc",
+    "src/profiling/memory/proc_utils.cc",
     "src/profiling/memory/process_matcher.cc",
     "src/profiling/memory/record_reader.cc",
     "src/profiling/memory/socket_listener.cc",
@@ -2424,6 +2425,7 @@
     "src/profiling/memory/heapprofd_integrationtest.cc",
     "src/profiling/memory/heapprofd_producer.cc",
     "src/profiling/memory/interner_unittest.cc",
+    "src/profiling/memory/proc_utils.cc",
     "src/profiling/memory/process_matcher.cc",
     "src/profiling/memory/process_matcher_unittest.cc",
     "src/profiling/memory/record_reader.cc",