Add NaCl proxy for pepper gamepad

ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_gamepad.cc

+// Copyright (c) 2012 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.
+
+#include "native_client/src/shared/ppapi_proxy/plugin_instance_data.h"
+#include "native_client/src/shared/ppapi_proxy/plugin_ppb_gamepad.h"
+#include "native_client/src/shared/ppapi_proxy/plugin_globals.h"
+#include "native_client/src/shared/ppapi_proxy/utility.h"
+#include "ppapi/c/pp_size.h"
+#include "ppapi/c/dev/ppb_fullscreen_dev.h"
+#include "srpcgen/ppb_rpc.h"
+
+namespace ppapi_proxy {
+
+namespace {
+
+void SampleGamepads(PP_Instance instance, struct PP_GamepadsData_Dev* pads) {
+  DebugPrintf("PPB_Gamepad::SampleGamepads: instance=%"NACL_PRIu32"\n",
+              instance);
+  if (pads == NULL)
+    return;
+
+  nacl_abi_size_t pads_bytes =
+      static_cast<nacl_abi_size_t>(sizeof(struct PP_GamepadsData_Dev));
+  NaClSrpcError srpc_result =
+      PpbGamepadRpcClient::PPB_Gamepad_SampleGamepads(
+          GetMainSrpcChannel(),
+          instance,
+          &pads_bytes,
+          reinterpret_cast<char*>(pads));
+  DebugPrintf("PPB_Gamepad::SampleGamepads: %s\n",
+              NaClSrpcErrorString(srpc_result));
+
+  if (srpc_result != NACL_SRPC_RESULT_OK)
+    pads->length = 0;
+}
+
+}  // namespace
+
+const PPB_Gamepad_Dev* PluginGamepad::GetInterface() {
+  static const PPB_Gamepad_Dev gamepad_interface = {
+    SampleGamepads
+  };
+  return &gamepad_interface;
+}
+
+}  // namespace ppapi_proxy