Add latency info to input events sent to RenderWidget.

content/common/input_messages.h

 // Copyright (c) 2013 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.
 
 // IPC messages for input events and other messages that require processing in
 // order relative to input events.
 // Multiply-included message file, hence no include guard.
 
 #include "base/string16.h"
+#include "cc/debug/latency_info.h"
 #include "content/common/content_export.h"
 #include "content/common/content_param_traits.h"
 #include "content/common/edit_command.h"
 #include "content/port/common/input_event_ack_state.h"
 #include "content/public/common/common_param_traits.h"
 #include "ipc/ipc_message_macros.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebInputEvent.h"
 #include "ui/gfx/point.h"
 #include "ui/gfx/rect.h"
 
 #undef IPC_MESSAGE_EXPORT
 #define IPC_MESSAGE_EXPORT CONTENT_EXPORT
 
 #ifdef IPC_MESSAGE_START
 #error IPC_MESSAGE_START
 #endif
 
 #define IPC_MESSAGE_START InputMsgStart
 
 IPC_ENUM_TRAITS(content::InputEventAckState)
 
 IPC_STRUCT_TRAITS_BEGIN(content::EditCommand)
   IPC_STRUCT_TRAITS_MEMBER(name)
   IPC_STRUCT_TRAITS_MEMBER(value)
 IPC_STRUCT_TRAITS_END()
 
 // Sends an input event to the render widget.
-IPC_MESSAGE_ROUTED2(InputMsg_HandleInputEvent,
+IPC_MESSAGE_ROUTED3(InputMsg_HandleInputEvent,
                     IPC::WebInputEventPointer /* event */,
+                    cc::LatencyInfo /* latency_info */,
                     bool /* is_keyboard_shortcut */)
 
 // Sends the cursor visibility state to the render widget.
 IPC_MESSAGE_ROUTED1(InputMsg_CursorVisibilityChange,
                     bool /* is_visible */)
 
 // This message notifies the renderer that the next key event is bound to one
 // or more pre-defined edit commands. If the next key event is not handled
 // by webkit, the specified edit commands shall be executed against current
 // focused frame.
@@ skipping 77 matching lines @@
 // Acknowledges receipt of a InputMsg_HandleInputEvent message.
 IPC_MESSAGE_ROUTED2(InputHostMsg_HandleInputEvent_ACK,
                     WebKit::WebInputEvent::Type,
                     content::InputEventAckState /* ack_result */)
 
 
 // Adding a new message? Stick to the sort order above: first platform
 // independent InputMsg, then ifdefs for platform specific InputMsg, then
 // platform independent InputHostMsg, then ifdefs for platform specific
 // InputHostMsg.