[Chromecast] Add REPEATED_OOM as reboot reason.

Bug: b/149108108
Test: Build
Change-Id: I59f91b0d042f4d74f16192cd1d693ddcdec53426
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2076700Reviewed-by: Sergey Volk <servolk@chromium.org>
Reviewed-by: Luke Halliwell (slow) <halliwell@chromium.org>
Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Commit-Queue: Forest Fraser <ffraser@google.com>
Cr-Commit-Position: refs/heads/master@{#744865}

chromecast/public/reboot_shlib.h

@@ -72,6 +72,9 @@ class CHROMECAST_EXPORT RebootShlib {
     // The device got into a state such that it needs to regenerate the cloud
     // device id.
     REGENERATE_CLOUD_ID = 12,
+
+    // A reboot is triggered due to successive OOM events.
+    REPEATED_OOM = 13,
   };
 
   // Initializes any platform-specific reboot systems.

chromecast/system/reboot/reboot_util_core.cc

@@ -41,6 +41,7 @@ bool RebootUtil::IsValidRebootSource(RebootShlib::RebootSource reboot_source) {
     case RebootShlib::RebootSource::SW_OTHER:
     case RebootShlib::RebootSource::OVERHEAT:
     case RebootShlib::RebootSource::REGENERATE_CLOUD_ID:
+    case RebootShlib::RebootSource::REPEATED_OOM:
       return true;
     default:
       return false;