Purge memory via MemoryCoordinatorClientRegistry when a backgrounded renderer is suspended.

content/public/common/content_features.cc

Index: content/public/common/content_features.cc
diff --git a/content/public/common/content_features.cc b/content/public/common/content_features.cc
index 3f83f88dac7277b0ba99cdcbb3ffc7e5499d07b3..ca9cac8b9bcc5afe2c8808cd87bd5279f7613b45 100644
--- a/content/public/common/content_features.cc
+++ b/content/public/common/content_features.cc
@@ -143,6 +143,10 @@ const base::Feature kPointerEvents{"PointerEvent",
 const base::Feature kPointerEventV1SpecCapturing{
     "PointerEventV1SpecCapturing", base::FEATURE_DISABLED_BY_DEFAULT};
 
+// Enables purge and suspend.
+const base::Feature kPurgeAndSuspend{"PurgeAndSuspend",
+                                     base::FEATURE_DISABLED_BY_DEFAULT};
+
 // RAF aligned mouse input events support.
 const base::Feature kRafAlignedMouseInputEvents{
     "RafAlignedMouseInput", base::FEATURE_DISABLED_BY_DEFAULT};