Gamepad API: add support for connection events

content/common/gamepad_messages.h

Index: content/common/gamepad_messages.h
diff --git a/content/common/gamepad_messages.h b/content/common/gamepad_messages.h
index 0532b9c562d0ef21d72b2a1b7162baab48cde730..a92fbb77415c69f5c22f42fb65cd82cdd12a63bc 100644
--- a/content/common/gamepad_messages.h
+++ b/content/common/gamepad_messages.h
@@ -5,12 +5,35 @@
 // Multiply-included message file, no include guard.
 
 #include "base/memory/shared_memory.h"
+#include "content/common/gamepad_connection_event_message_params.h"
 #include "ipc/ipc_message_macros.h"
 #include "ipc/ipc_param_traits.h"
 #include "ipc/ipc_platform_file.h"
+#include "third_party/WebKit/public/platform/WebGamepad.h"
 
 #define IPC_MESSAGE_START GamepadMsgStart
 
+IPC_STRUCT_TRAITS_BEGIN(blink::WebGamepadButton)
+  IPC_STRUCT_TRAITS_MEMBER(pressed)
+  IPC_STRUCT_TRAITS_MEMBER(value)
+IPC_STRUCT_TRAITS_END()
+
+IPC_STRUCT_TRAITS_BEGIN(content::GamepadConnectionEventMessageParams)
+  IPC_STRUCT_TRAITS_MEMBER(id_characters)
+  IPC_STRUCT_TRAITS_MEMBER(mapping_characters)
+  IPC_STRUCT_TRAITS_MEMBER(index)
+  IPC_STRUCT_TRAITS_MEMBER(timestamp)
+  IPC_STRUCT_TRAITS_MEMBER(axes_length)
+  IPC_STRUCT_TRAITS_MEMBER(buttons_length)
+  IPC_STRUCT_TRAITS_MEMBER(connected)
+IPC_STRUCT_TRAITS_END()
+
+IPC_MESSAGE_CONTROL1(GamepadMsg_GamepadConnected,
+                     content::GamepadConnectionEventMessageParams)
+
+IPC_MESSAGE_CONTROL1(GamepadMsg_GamepadDisconnected,
+                     content::GamepadConnectionEventMessageParams)
+
 // Messages sent from the renderer to the browser.
 
 // Asks the browser process to start polling, and return a shared memory