Implement the gamepad API in the IPC proxy

ppapi/shared_impl/ppb_gamepad_shared.cc

Index: ppapi/shared_impl/ppb_gamepad_shared.cc
diff --git a/ppapi/shared_impl/ppb_gamepad_shared.cc b/ppapi/shared_impl/ppb_gamepad_shared.cc
new file mode 100644
index 0000000000000000000000000000000000000000..41c7668ebb1c62fda45cffd0acfcf848de3fe334
--- /dev/null
+++ b/ppapi/shared_impl/ppb_gamepad_shared.cc
@@ -0,0 +1,37 @@
+// 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/shared_impl/ppb_gamepad_shared.h"
+
+#include "base/basictypes.h"
+
+namespace ppapi {
+
+void ConvertWebKitGamepadData(const WebKitGamepads& webkit_data,
+                              PP_GamepadsSampleData* output_data) {
+  output_data->length = webkit_data.length;
+  for (unsigned i = 0; i < webkit_data.length; ++i) {
+    PP_GamepadSampleData& output_pad = output_data->items[i];
+    const WebKitGamepad& webkit_pad = webkit_data.items[i];
+    output_pad.connected = webkit_pad.connected ? PP_TRUE : PP_FALSE;
+    if (webkit_pad.connected) {
+      COMPILE_ASSERT(sizeof(output_pad.id) == sizeof(webkit_pad.id),
+                     id_size_does_not_match);
+      COMPILE_ASSERT(sizeof(output_pad.axes) == sizeof(webkit_pad.axes),
+                     axes_size_does_not_match);
+      COMPILE_ASSERT(sizeof(output_pad.buttons) == sizeof(webkit_pad.buttons),
+                     buttons_size_does_not_match);
+      memcpy(output_pad.id, webkit_pad.id, sizeof(output_pad.id));
+      output_pad.timestamp = webkit_pad.timestamp;
+      output_pad.axes_length = webkit_pad.axes_length;
+      memcpy(output_pad.axes, webkit_pad.axes, sizeof(output_pad.axes));
+      output_pad.buttons_length = webkit_pad.buttons_length;
+      memcpy(output_pad.buttons,
+             webkit_pad.buttons,
+             sizeof(output_pad.buttons));
+    }
+  }
+}
+
+}  // namespace ppapi