[Offline indicator v2] Lay the foundation to add a status indicator

This CL adds a compositor scene layer and a JNI bridge that will
connect it to the Java side.

Bug: 989148
Change-Id: I3f4112f50a1735dad2e9edfecd639ac1d0add9e1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1769631
Commit-Queue: Sinan Sahin <[email protected]>
Reviewed-by: Matthew Jones <[email protected]>
Reviewed-by: Theresa  <[email protected]>
Cr-Commit-Position: refs/heads/master@{#696206}
diff --git a/chrome/browser/flag_descriptions.cc b/chrome/browser/flag_descriptions.cc
index d435c23..04cef05 100644
--- a/chrome/browser/flag_descriptions.cc
+++ b/chrome/browser/flag_descriptions.cc
@@ -2521,6 +2521,10 @@
 const char kOfflineIndicatorChoiceDescription[] =
     "Show an offline indicator while offline.";
 
+const char kOfflineIndicatorV2Name[] = "Offline indicator V2";
+const char kOfflineIndicatorV2Description[] =
+    "Show a persistent offline indicator when offline.";
+
 const char kOfflinePagesCtName[] = "Enable Offline Pages CT features.";
 const char kOfflinePagesCtDescription[] = "Enable Offline Pages CT features.";