Add experimental Support for DOM3 KeyboardEvent key value

public/platform/Platform.h

Index: public/platform/Platform.h
diff --git a/public/platform/Platform.h b/public/platform/Platform.h
index 0f2d2bbfb334aa8f8fdb842a0fb158eb3bf0d8af..43bf102bc2db34d7660253a588a806d018fd5416 100644
--- a/public/platform/Platform.h
+++ b/public/platform/Platform.h
@@ -618,6 +618,18 @@ public:
     // Returns 0, if DOM code enum is not found.
     virtual int domEnumFromCodeString(const WebString& codeString) { return 0; }
 
+    // This method converts from the supplied DOM key enum to the
+    // embedder's DOM key string value for the key pressed. |domKey| values are
+    // based on the value defined in ui/events/keycodes/dom3/dom_key_data.h.
+    // Returns null string, if DOM key value is not found.
+    virtual WebString domKeyStringFromEnum(int domKey) { return WebString(); }
+
+    // This method converts from the suppled DOM Key value to the
+    // embedder's DOM key enum for the key pressed. |keyString| is defined in
+    // ui/events/keycodes/dom3/dom_key_data.h.
+    // Returns 0, if DOM key enum is not found.
+    virtual int domEnumFromKeyString(const WebString& keyString) { return 0; }
+
     // Quota -----------------------------------------------------------
 
     // Queries the storage partition's storage usage and quota information.