Add support for touch-action: pinch-zoom.

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"
@@ skipping 38 matching lines @@
     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)
 IPC_ENUM_TRAITS_MAX_VALUE(content::InputEventDispatchType,
                           content::InputEventDispatchType::DISPATCH_TYPE_MAX)
-IPC_ENUM_TRAITS_VALIDATE(content::TouchAction, (
-    value >= 0 &&
-    value <= content::TOUCH_ACTION_MAX &&
-    (!(value & content::TOUCH_ACTION_NONE) ||
-        (value == content::TOUCH_ACTION_NONE)) &&
-    (!(value & content::TOUCH_ACTION_PINCH_ZOOM) ||
-        (value == content::TOUCH_ACTION_MANIPULATION))))
+IPC_ENUM_TRAITS_MAX_VALUE(content::TouchAction, content::TOUCH_ACTION_MAX)
 
 IPC_STRUCT_TRAITS_BEGIN(content::DidOverscrollParams)
   IPC_STRUCT_TRAITS_MEMBER(accumulated_overscroll)
   IPC_STRUCT_TRAITS_MEMBER(latest_overscroll_delta)
   IPC_STRUCT_TRAITS_MEMBER(current_fling_velocity)
   IPC_STRUCT_TRAITS_MEMBER(causal_event_viewport_point)
 IPC_STRUCT_TRAITS_END()
 
 IPC_STRUCT_TRAITS_BEGIN(content::EditCommand)
   IPC_STRUCT_TRAITS_MEMBER(name)
@@ skipping 225 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.