Add MemoryWedge to ios/.

ios/chrome/browser/experimental_flags.h

Index: ios/chrome/browser/experimental_flags.h
diff --git a/ios/chrome/browser/experimental_flags.h b/ios/chrome/browser/experimental_flags.h
index 81e1cf0f9824cd452962ffea59942ea5a9c79a09..1cd81a28c5974bbf316984d8b65a1be437a99729 100644
--- a/ios/chrome/browser/experimental_flags.h
+++ b/ios/chrome/browser/experimental_flags.h
@@ -5,6 +5,8 @@
 #ifndef IOS_CHROME_BROWSER_EXPERIMENTAL_FLAGS_H_
 #define IOS_CHROME_BROWSER_EXPERIMENTAL_FLAGS_H_
 
+#include <stdlib.h>
+
 // This file can be empty. Its purpose is to contain the relatively short lived
 // declarations required for experimental flags.
 
@@ -13,6 +15,10 @@ namespace experimental_flags {
 // Returns true if the contents of the clipboard can be used for autocomplete.
 bool IsOpenFromClipboardEnabled();
 
+// Returns the size in MB of the memory wedge to insert during a cold start.
+// If 0, no memory wedge should be inserted.
+size_t MemoryWedgeSizeInMB();
+
 }  // namespace experimental_flags
 
 #endif  // IOS_CHROME_BROWSER_EXPERIMENTAL_FLAGS_H_