test_apps

Added an LLSD argument to LLPluginClassMedia::keyEvent() and LLPluginClassMedia::textInput() which contains the native key data.
Made LLViewerMediaImpl retrieve the native key data and pass it to keyEvent and textInput.
Added a native_key_data parameter to the text_event and key_event messages.
Made the webkit plugin extract the native_key_data parameter and pass it to the internal keyEvent() and unicodeInput() functions.
Fixed LLMediaPluginTest to match function signature change to LLPluginClassMedia::keyEvent().