Support multiple logs provider at the same time.

Now DEVICE_LOGS_PROVIDER_PACKAGE is a CSV and the first successfully resolved one would be used.


Bug: b/143482167
Change-Id: Ieaa204b1ea4ca8002f2711d60d103fc54178a51f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1887846
Reviewed-by: Luke Halliwell (slow) <halliwell@chromium.org>
Reviewed-by: Simeon Anfinrud <sanfin@chromium.org>
Commit-Queue: Chunlei Niu <niuchl@google.com>
Auto-Submit: Chunlei Niu <niuchl@google.com>
Cr-Commit-Position: refs/heads/master@{#711525}

diff --git a/chromecast/chromecast.gni b/chromecast/chromecast.gni
index 6f56378..56eed455 100644
--- a/chromecast/chromecast.gni
+++ b/chromecast/chromecast.gni

@@ -73,6 +73,7 @@
     # Set the package name and class path for the component which will provide device logs
     # Values defined in eureka-internal
     # These values are unused if use_remote_service_logcat is false
+    # device_logs_provider_package is a CSV, and the first resolved one would be used.
     device_logs_provider_package = ""
     device_logs_provider_class = ""
   }