plugin_vm: Adding UI and flag for pluginvm camera permissions

Adding the basic UI requirements needed for plugin vm camera
permissions and putting it all behind a feature flag whilst it's being
worked on.

Bug: 1071873
Change-Id: I2930f03eeb6dc23a65cf1ddbcaa534e25f27f379
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2230427
Reviewed-by: Timothy Loh <[email protected]>
Reviewed-by: Jeevan Shikaram <[email protected]>
Reviewed-by: Dominick Ng <[email protected]>
Reviewed-by: Kyle Horimoto <[email protected]>
Commit-Queue: Daniel Ng <[email protected]>
Cr-Commit-Position: refs/heads/master@{#776345}
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index 4035888e..7e486760 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -2102,6 +2102,9 @@
 extern const char kTerminalSystemAppLegacySettingsName[];
 extern const char kTerminalSystemAppLegacySettingsDescription[];
 
+extern const char kPluginVmShowCameraPermissionsName[];
+extern const char kPluginVmShowCameraPermissionsDescription[];
+
 extern const char kTrimOnFreezeName[];
 extern const char kTrimOnFreezeDescription[];