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..ea8b79c50f9d9d5a2ca409ff9e705fbf15dffa98 100644
--- a/content/public/test/browser_test_utils.h
+++ b/content/public/test/browser_test_utils.h
@@ -79,6 +79,7 @@ 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 0.
 void SimulateKeyPress(WebContents* web_contents,
                       ui::KeyboardCode key,
                       bool control,
@@ -86,6 +87,18 @@ void SimulateKeyPress(WebContents* web_contents,
                       bool alt,
                       bool command);
 
+// Sends a key press asynchronously.
+// The native code of the key event will be set based on |code|.
+// TODO: should we have an overload that takes only KeyboardCode or
+// |code| and generates the other one based on US keyboard layout?
+void SimulateKeyPress(WebContents* web_contents,
+                      ui::KeyboardCode key,
+                      const char* code,
+                      bool control,
+                      bool shift,
+                      bool alt,
+                      bool command);
+
 // Allow ExecuteScript* methods to target either a WebContents or a
 // RenderViewHost.  Targetting a WebContents means executing script in the
 // RenderViewHost returned by WebContents::GetRenderViewHost(), which is the