[RESTRICT AUTOMERGE] cameraserver: Add watchdog timer for disconnect.

Bug: 228641945

Test: Add artifical delay of 2 seconds in disconnectImpl, see tombstone

Change-Id: I11254e04d9d883e839dc1a7eee309e249613957e
Signed-off-by: Jayant Chowdhary <jchowdhary@google.com>
diff --git a/services/camera/libcameraservice/CameraServiceWatchdog.h b/services/camera/libcameraservice/CameraServiceWatchdog.h
index f4955e2..29ddab1 100644
--- a/services/camera/libcameraservice/CameraServiceWatchdog.h
+++ b/services/camera/libcameraservice/CameraServiceWatchdog.h
@@ -26,7 +26,7 @@
  *   and single call monitoring differently. See function documentation for
  *   more details.
  */
-
+#pragma once
 #include <chrono>
 #include <thread>
 #include <time.h>
@@ -61,7 +61,7 @@
     /** Used to wrap monitored calls in start and stop functions using custom timer values */
     template<typename T>
     auto watchThread(T func, uint32_t tid, uint32_t cycles, uint32_t cycleLength) {
-        auto res = NULL;
+        decltype(func()) res;
 
         if (cycles != mMaxCycles || cycleLength != mCycleLengthMs) {
             // Create another instance of the watchdog to prevent disruption
@@ -84,10 +84,9 @@
     /** Used to wrap monitored calls in start and stop functions using class timer values */
     template<typename T>
     auto watchThread(T func, uint32_t tid) {
-        auto res = NULL;
 
         start(tid);
-        res = func();
+        auto res = func();
         stop(tid);
 
         return res;