Add GetUsbKeyCode dev interface for Pepper key events

ppapi/cpp/input_event.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PPAPI_CPP_INPUT_EVENT_H_
 #define PPAPI_CPP_INPUT_EVENT_H_
 
 #include <string>
 
+#include "ppapi/c/dev/ppb_keyboard_input_event_dev.h"
 #include "ppapi/c/ppb_input_event.h"
 #include "ppapi/cpp/resource.h"
 
 /// @file
 /// This file defines the API used to handle mouse and keyboard input events.
 
 namespace pp {
 
 class FloatPoint;
 class Instance;
@@ skipping 273 matching lines @@
   /// Returns the DOM keyCode field for the keyboard event.
   /// Chrome populates this with the Windows-style Virtual Key code of the key.
   uint32_t GetKeyCode() const;
 
   /// Returns the typed character for the given character event.
   ///
   /// @return A string var representing a single typed character for character
   /// input events. For non-character input events the return value will be an
   /// undefined var.
   Var GetCharacterText() const;
+
+  /// PPB_KeyboardInputEvent_Dev interface.

[brettw, 2012/02/15 00:42:44]

I prefer not to have Dev interfaces in the C++ wrappers except in a dev
directory. In this case, I don't think it's a huge problem to just not bother
with C++ wrappers for the USB stuff. For the few people that want to test this
out, they can just call into the C API.

[Wez, 2012/02/16 19:18:51]

Agreed; the API is sufficiently simple that this shouldn't pose a problem.  As
for the C APIs, the C++ wrappers outside a dev/ sub-directory should only
contain stuff that calling code can rely on.

[garykac, 2012/02/16 20:45:03]

Done (patchset 13)

+
+  /// Sets the USB scancode for this key event. When the USB scancode is moved
+  /// out of _Dev, <code>usb_scan_code</code> will be added as a parameter
+  /// to <code>Create</code> and this method will be removed.
+  ///
+  /// @param[in] usb_scan_code The USB scancode that corresponds to the key
+  /// that generated this keyboard event.
+  bool SetUsbScanCode(uint32_t usb_scan_code);
+
+  /// Returns the USB scancode that corresponds to the key that generated this
+  /// keyboard event.
+  uint32_t GetUsbScanCode() const;
 };
 
 }  // namespace pp
 
 #endif  // PPAPI_CPP_INPUT_EVENT_H_