[KeyboardEvent] Add embedder APIs to translate between Dom |key| enum and strings

ui/events/keycodes/dom/dom_key.h

Index: ui/events/keycodes/dom/dom_key.h
diff --git a/ui/events/keycodes/dom/dom_key.h b/ui/events/keycodes/dom/dom_key.h
index 25ea09209b522e649fae8c8f5fe6e6a3438974d8..23f980b51adc6fa341877d0615e771b54e1f2f31 100644
--- a/ui/events/keycodes/dom/dom_key.h
+++ b/ui/events/keycodes/dom/dom_key.h
@@ -7,6 +7,13 @@
 
 namespace ui {
 
+// This is specific for Blink Embedded API.
+// A base of 512 (0x400) is used to differentiate between
+// DOM |Key| printable and non-printable values.
+// DOM |Key| printable value is between 0 to 0x400 and
+// DOM |Key| non-printable value is over 0x400.
+#define DOM_KEY_PRINT_NON_DIFF 0x400

[Wez, 2015/06/25 10:40:21]

Where does this value come from? DOM |key| could contain any Unicode code-point,
so surely this needs to be at least 0x110000 (one above the maximum Unicode code
point)?

[Habib Virji, 2015/06/26 17:35:38]

Updated to 0x110000

+
 #define DOM_KEY_MAP(key, id) id
 #define DOM_KEY_MAP_DECLARATION enum class DomKey
 #include "ui/events/keycodes/dom/dom_key_data.inc"