[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 0b8777cdc495c4766262d7604c9983b54c16640e..a22117f698eb6842167749414cf3fd51cc890ea6 100644
--- a/content/child/blink_platform_impl.cc
+++ b/content/child/blink_platform_impl.cc
@@ -1275,4 +1275,14 @@ 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)));

[Wez, 2015/04/21 02:25:58]

nit: Strictly speaking the behaviour of static_cast<enum> is undefined if you
pass in an int value that is not a valid enum value, IIRC; we seem to be doing
the same thing above for domCodeStringFromEnum, though, and these should always
be values that we provided in the first place, so shouldn't be a problem.

[Habib Virji, 2015/04/29 16:05:18]

Right wez,this issue was discussed in domCodeString case too and the conclusion
was as you stated above, since the value here are sent by the embedder API. It
should be okay.

+}
+
+int BlinkPlatformImpl::domKeyEnumFromString(const WebString& key) {
+  return static_cast<int>(ui::KeycodeConverter::KeyStringToDomKey(
+      key.utf8().data()));
+}
+
 }  // namespace content