Expose a method to access amount of memory used by the current process.

webkit/api/public/WebKitClient.h

Index: webkit/api/public/WebKitClient.h
===================================================================
--- webkit/api/public/WebKitClient.h	(revision 30574)
+++ webkit/api/public/WebKitClient.h	(working copy)
@@ -159,6 +159,14 @@
                                                             const WebKit::WebString& challenge,
                                                             const WebKit::WebURL& url) = 0;
 
+
+        // Memory --------------------------------------------------------------
+
+        // Returns the current space allocated for the pagefile, in MB.
+        // That is committed size for Windows and virtual memory size for POSIX
+        virtual int memoryUsageMB() = 0;
+
+
         // Message Ports -------------------------------------------------------
 
         // Creates a Message Port Channel.  This can be called on any thread.