Add experimental Support for DOM3 KeyboardEvent key value

Source/devtools/protocol.json

Index: Source/devtools/protocol.json
diff --git a/Source/devtools/protocol.json b/Source/devtools/protocol.json
index f25c00a2908ef3a1e229f1d425b8204ba6751589..204dbbc73f8515e7c264274b5d973fafaee0f8f0 100644
--- a/Source/devtools/protocol.json
+++ b/Source/devtools/protocol.json
@@ -4331,6 +4331,7 @@
                     { "name": "unmodifiedText", "type": "string", "optional": true, "description": "Text that would have been generated by the keyboard if no modifiers were pressed (except for shift). Useful for shortcut (accelerator) key handling (default: \"\")." },
                     { "name": "keyIdentifier", "type": "string", "optional": true, "description": "Unique key identifier (e.g., 'U+0041') (default: \"\")." },
                     { "name": "code", "type": "string", "optional": true, "description": "Unique DOM defined string value for each physical key (e.g., 'KeyA') (default: \"\")." },
+                    { "name": "key", "type": "string", "optional": true, "description": "Unique DOM defined string value describing the meaning of the key in the context of active modifiers, keyboard layout, etc (e.g., 'AltGr') (default: \"\")." },

[dgozman, 2015/04/30 09:21:09]

Note that you will not be able to commit this without changing
content/browser/devtools/protocol/input_handler.{h,cc} first. I think it would
be easier for you to split devtools patch off this, and add support to devtools
protocol separately.

[Habib Virji, 2015/04/30 10:11:52]

Thanks dgozman, it makes sense. I will try to land this CL. Then send a CL for
content/browser/devtools/protocol/input_handler.{h,cc}  changes, followed by
Blink changes.

                     { "name": "windowsVirtualKeyCode", "type": "integer", "optional": true, "description": "Windows virtual key code (default: 0)." },
                     { "name": "nativeVirtualKeyCode", "type": "integer", "optional": true, "description": "Native virtual key code (default: 0)." },
                     { "name": "autoRepeat", "type": "boolean", "optional": true, "description": "Whether the event was generated from auto repeat (default: false)." },