Add NaCl proxy for pepper gamepad

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

Index: ppapi/native_client/src/shared/ppapi_proxy/ppb_rpc_client.cc
diff --git a/ppapi/native_client/src/shared/ppapi_proxy/ppb_rpc_client.cc b/ppapi/native_client/src/shared/ppapi_proxy/ppb_rpc_client.cc
index d52966609e3c8b20401736589ece0964182b0bf5..85c452fbae660a7d498d963f1743f7d40b8db422 100644
--- a/ppapi/native_client/src/shared/ppapi_proxy/ppb_rpc_client.cc
+++ b/ppapi/native_client/src/shared/ppapi_proxy/ppb_rpc_client.cc
@@ -1158,6 +1158,23 @@ NaClSrpcError PpbFullscreenRpcClient::PPB_Fullscreen_GetScreenSize(
   return retval;
 }
 
+NaClSrpcError PpbGamepadRpcClient::PPB_Gamepad_SampleGamepads(
+    NaClSrpcChannel* channel,
+    PP_Instance instance,
+    nacl_abi_size_t* data_bytes, char* data)  {
+  VCHECK(ppapi_proxy::PPBCoreInterface()->IsMainThread(),
+         ("%s: PPAPI calls are not supported off the main thread\n",
+          __FUNCTION__));
+  NaClSrpcError retval;
+  retval = NaClSrpcInvokeBySignature(
+      channel,
+      "PPB_Gamepad_SampleGamepads:i:C",
+      instance,
+      data_bytes, data
+  );
+  return retval;
+}
+
 NaClSrpcError PpbGraphics2DRpcClient::PPB_Graphics2D_Create(
     NaClSrpcChannel* channel,
     PP_Instance instance,