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

content/child/blink_platform_impl.cc

Index: content/child/blink_platform_impl.cc
diff --git a/content/child/blink_platform_impl.cc b/content/child/blink_platform_impl.cc
index ffea5f9f7bde53e696c9a04c8c913286d074d3a8..bb71ddc943304a16fa558b9163b21242ea8cf6c7 100644
--- a/content/child/blink_platform_impl.cc
+++ b/content/child/blink_platform_impl.cc
@@ -1263,4 +1263,14 @@ int BlinkPlatformImpl::domEnumFromCodeString(const WebString& code) {
       code.utf8().data()));
 }
 
+WebString BlinkPlatformImpl::domKeyStringFromEnum(int dom_key) {
+  return WebString::fromUTF8(ui::KeycodeConverter::DomKeyToKeyString(
+      static_cast<ui::DomKey>(dom_key)));
+}
+
+int BlinkPlatformImpl::domEnumFromKeyString(const WebString& key) {
+  return static_cast<int>(ui::KeycodeConverter::KeyStringToDomKey(
+      key.utf8().data()));
+}
+
 }  // namespace content