Add delegated compositing flag in chrome://flags page

This is simply so users (non-devs) can disable delegated compositing on
the fly if they run into some specific issue.


Bug: 1219029
Change-Id: Idd0d7cfe772499d0f8e19c4d996fab878bfb6246
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3428907
Reviewed-by: Robert Kroeger <[email protected]>
Commit-Queue: Peter McNeeley <[email protected]>
Cr-Commit-Position: refs/heads/main@{#965850}
diff --git a/chrome/browser/flag_descriptions.cc b/chrome/browser/flag_descriptions.cc
index b95773e..ed9c701 100644
--- a/chrome/browser/flag_descriptions.cc
+++ b/chrome/browser/flag_descriptions.cc
@@ -759,6 +759,10 @@
 const char kEnableRawDrawDescription[] =
     "When enabled, web content will be rastered on output surface directly.";
 
+const char kEnableDelegatedCompositingName[] = "Enable delegated compositing";
+const char kEnableDelegatedCompositingDescription[] =
+    "When enabled and applicable, the act of compositing is delegated to Ash.";
+
 const char kEnableRemovingAllThirdPartyCookiesName[] =
     "Enable removing SameSite=None cookies";
 const char kEnableRemovingAllThirdPartyCookiesDescription[] =