Add memory ablation experiment.

chrome/browser/flag_descriptions.cc

Index: chrome/browser/flag_descriptions.cc
diff --git a/chrome/browser/flag_descriptions.cc b/chrome/browser/flag_descriptions.cc
index 11cb19d4698143ec6ba01a6728085b7a3323d13d..7ebc199b9a1bef44b28e2d68895ed390fd5c05f3 100644
--- a/chrome/browser/flag_descriptions.cc
+++ b/chrome/browser/flag_descriptions.cc
@@ -2804,6 +2804,10 @@ const char kDebugShortcutsDescription[] =
     "Enables additional keyboard shortcuts that are useful for debugging "
     "Ash.";
 
+const char kMemoryAblationName[] = "Memory ablation experiment";
+const char kMemoryAblationDescription[] =
+    "Allocates extra memory in the browser process.";
+
 #if defined(OS_ANDROID)
 
 const char kEnableCustomContextMenuName[] = "Enable custom context menu";