[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..11fdc097444a371e7813c267d278c776baeb11dc 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 0x110000 and
+// DOM |Key| non-printable value is over 0x110000.
+#define DOM_KEY_PRINT_NON_DIFF 0x110000

[Wez, 2015/07/25 23:12:26]

See comments on Blink API impl - I don't think you need this, if you move
CHARACTER to be the maximum DomKey enum value.

[Habib Virji, 2015/07/31 16:17:29]

This is removed now.

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