Don't restart the hang renderer timeout on messages ack'd from the compositor thread.

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/strings/string16.h"
 #include "build/build_config.h"
 #include "content/common/content_export.h"
 #include "content/common/content_param_traits.h"
 #include "content/common/edit_command.h"
 #include "content/common/input/input_event.h"
 #include "content/common/input/input_event_ack.h"
+#include "content/common/input/input_event_ack_source.h"
 #include "content/common/input/input_event_ack_state.h"
 #include "content/common/input/input_event_dispatch_type.h"
 #include "content/common/input/input_param_traits.h"
 #include "content/common/input/synthetic_gesture_packet.h"
 #include "content/common/input/synthetic_gesture_params.h"
 #include "content/common/input/synthetic_pinch_gesture_params.h"
 #include "content/common/input/synthetic_pointer_action_params.h"
 #include "content/common/input/synthetic_smooth_drag_gesture_params.h"
 #include "content/common/input/synthetic_smooth_scroll_gesture_params.h"
 #include "content/common/input/synthetic_tap_gesture_params.h"
@@ skipping 11 matching lines @@
 
 #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_MAX_VALUE(content::InputEventAckSource,
+                          content::InputEventAckSource::MAX)
 IPC_ENUM_TRAITS_MAX_VALUE(
     content::SyntheticGestureParams::GestureSourceType,
     content::SyntheticGestureParams::GESTURE_SOURCE_TYPE_MAX)
 IPC_ENUM_TRAITS_MAX_VALUE(
     content::SyntheticGestureParams::GestureType,
     content::SyntheticGestureParams::SYNTHETIC_GESTURE_TYPE_MAX)
 IPC_ENUM_TRAITS_MAX_VALUE(
     content::SyntheticPointerActionParams::PointerActionType,
     content::SyntheticPointerActionParams::PointerActionType::
         POINTER_ACTION_TYPE_MAX)
@@ skipping 51 matching lines @@
 IPC_STRUCT_TRAITS_END()
 
 IPC_STRUCT_TRAITS_BEGIN(content::SyntheticPointerActionParams)
   IPC_STRUCT_TRAITS_PARENT(content::SyntheticGestureParams)
   IPC_STRUCT_TRAITS_MEMBER(pointer_action_type_)
   IPC_STRUCT_TRAITS_MEMBER(index_)
   IPC_STRUCT_TRAITS_MEMBER(position_)
 IPC_STRUCT_TRAITS_END()
 
 IPC_STRUCT_TRAITS_BEGIN(content::InputEventAck)
+  IPC_STRUCT_TRAITS_MEMBER(source)
   IPC_STRUCT_TRAITS_MEMBER(type)
   IPC_STRUCT_TRAITS_MEMBER(state)
   IPC_STRUCT_TRAITS_MEMBER(latency)
   IPC_STRUCT_TRAITS_MEMBER(overscroll)
   IPC_STRUCT_TRAITS_MEMBER(unique_touch_event_id)
 IPC_STRUCT_TRAITS_END()
 
 // Sends an input event to the render widget.
 IPC_MESSAGE_ROUTED3(InputMsg_HandleInputEvent,
                     IPC::WebInputEventPointer /* event */,
@@ skipping 182 matching lines @@
 // This IPC message sends the character bounds after every composition change
 // to always have correct bound info.
 IPC_MESSAGE_ROUTED2(InputHostMsg_ImeCompositionRangeChanged,
                     gfx::Range /* composition range */,
                     std::vector<gfx::Rect> /* character bounds */)
 
 // 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.