Add a skeleton gamepad resource.

ppapi/proxy/gamepad_resource.cc

Index: ppapi/proxy/gamepad_resource.cc
diff --git a/ppapi/proxy/gamepad_resource.cc b/ppapi/proxy/gamepad_resource.cc
new file mode 100644
index 0000000000000000000000000000000000000000..21ee02d9de9fa1cce6f3dc6b4ce99885691e4a7d
--- /dev/null
+++ b/ppapi/proxy/gamepad_resource.cc
@@ -0,0 +1,58 @@
+// 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 "ppapi/proxy/gamepad_resource.h"
+
+#include <string.h>
+
+#include "ppapi/c/ppb_gamepad.h"
+#include "ppapi/proxy/dispatch_reply_message.h"
+#include "ppapi/proxy/ppapi_messages.h"
+
+namespace ppapi {
+namespace proxy {
+
+GamepadResource::GamepadResource(Connection connection, PP_Instance instance)
+    : PluginResource(connection, instance),
+      buffer_(NULL) {
+  SendCreateToBrowser(PpapiHostMsg_Gamepad_Create());
+  CallBrowser(PpapiHostMsg_Gamepad_RequestMemory());
+}
+
+GamepadResource::~GamepadResource() {
+}
+
+void GamepadResource::Sample(PP_GamepadsSampleData* data) {
+  if (!buffer_) {
+    // Browser hasn't sent back our shared memory, give the plugin gamepad
+    // data corresponding to "not connected".
+    memset(data, 0, sizeof(PP_GamepadsSampleData));
+  } else {
+    memcpy(data, buffer_, sizeof(PP_GamepadsSampleData));
+  }
+}
+
+void GamepadResource::OnReplyReceived(const ResourceMessageReplyParams& params,
+                                      const IPC::Message& msg) {
+  IPC_BEGIN_MESSAGE_MAP(GamepadResource, msg)
+    PPAPI_DISPATCH_RESOURCE_REPLY(PpapiPluginMsg_Gamepad_SendMemory,
+                                  OnPluginMsgSendMemory)
+  IPC_END_MESSAGE_MAP()
+}
+
+void GamepadResource::OnPluginMsgSendMemory(
+    const ResourceMessageReplyParams& params,
+    base::SharedMemoryHandle shared_memory_handle) {
+  /* TODO(brettw) implement this when we have shared gamepad code. It would be
+     something like this:
+  shared_memory_.reset(
+      new base::SharedMemory(shared_memory_handle, true));
+  CHECK(shared_memory_->Map(sizeof(GamepadHardwareBuffer)));
+  void *memory = shared_memory_->memory();
+  // Use the memory...
+  */
+}
+
+}  // namespace proxy
+}  // namespace ppapi