Add a CodeToNativeKeycode helper that converts UIEvent code to native code.

content/public/test/browser_test_utils.h

Index: content/public/test/browser_test_utils.h
diff --git a/content/public/test/browser_test_utils.h b/content/public/test/browser_test_utils.h
index 4dce33e2df01ceebc72aab4bc34a01265c7fc7fb..985658a8d84665133a5655896c80b6c38206172f 100644
--- a/content/public/test/browser_test_utils.h
+++ b/content/public/test/browser_test_utils.h
@@ -79,8 +79,21 @@ void SimulateMouseEvent(WebContents* web_contents,
                         const gfx::Point& point);
 
 // Sends a key press asynchronously.
+// The native code of the key event will be set to InvalidNativeKeycode().
 void SimulateKeyPress(WebContents* web_contents,
-                      ui::KeyboardCode key,
+                      ui::KeyboardCode keyCode,
+                      bool control,
+                      bool shift,
+                      bool alt,
+                      bool command);
+
+// Sends a key press asynchronously.
+// |code| specifies the UIEvents (aka: DOM4Events) value of the key:
+// https://dvcs.w3.org/hg/d4e/raw-file/tip/source_respec.htm
+// The native code of the key event will be set based on |code|.
+void SimulateKeyPressWithCode(WebContents* web_contents,
+                      ui::KeyboardCode keyCode,
+                      const char* code,
                       bool control,
                       bool shift,
                       bool alt,