touchui: support XInput2 MT

build/common.gypi

 # Copyright (c) 2011 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 196 matching lines @@
 
       # Enable Web Intents and supporting UI.
       'enable_web_intents%': 0,
 
       # Smooth scrolling is disabled by default.
       'enable_smooth_scrolling%': 0,
 
       # Webrtc compilation is enabled by default. Set to 0 to disable.
       'enable_webrtc%': 1,
 
+      # XInput2 multitouch support is disabled by default.
+      'use_xi2_mt%': 0,
+
       'conditions': [
         # Use Skia as WebKit renderer on Mac
         ['OS=="mac"', {
           'use_skia%': 0,
         }, {
           'use_skia%': 1,
         }],
 
         # A flag for POSIX platforms
         ['OS=="win"', {
@@ skipping 71 matching lines @@
     'use_aura%': '<(use_aura)',
     'os_posix%': '<(os_posix)',
     'toolkit_uses_gtk%': '<(toolkit_uses_gtk)',
     'use_skia%': '<(use_skia)',
     'use_x11%': '<(use_x11)',
     'use_gnome_keyring%': '<(use_gnome_keyring)',
     'linux_fpic%': '<(linux_fpic)',
     'enable_flapper_hacks%': '<(enable_flapper_hacks)',
     'chromeos%': '<(chromeos)',
     'touchui%': '<(touchui)',
+    'use_xi2_mt%':'<(use_xi2_mt)',
     'webui_dialogs%': '<(webui_dialogs)',
     'file_manager_extension%': '<(file_manager_extension)',
     'webui_task_manager%': '<(webui_task_manager)',
     'inside_chromium_build%': '<(inside_chromium_build)',
     'fastbuild%': '<(fastbuild)',
     'python_ver%': '<(python_ver)',
     'armv7%': '<(armv7)',
     'arm_neon%': '<(arm_neon)',
     'sysroot%': '<(sysroot)',
     'disable_sse2%': '<(disable_sse2)',
@@ skipping 475 matching lines @@
       }],
       ['use_aura==1', {
         'defines': ['USE_AURA=1'],
       }],
       ['chromeos==1', {
         'defines': ['OS_CHROMEOS=1'],
       }],
       ['touchui==1', {
         'defines': ['TOUCH_UI=1'],
       }],
+      ['use_xi2_mt==1', {
+        'defines': ['USE_XI2_MT=1'],

[Daniel Kurtz, 2011/09/20 05:12:27]

Here, could you set USE_XI2_MT equal to the required XI2 minor minimum version? 
Is there any precedence for non-boolean define values?

[ningxin.hu, 2011/09/20 14:28:59]

Good idea! Will implement it.

+      }],
       ['use_wayland==1', {
         'defines': ['USE_WAYLAND=1', 'WL_EGL_PLATFORM=1'],
       }],
       ['file_manager_extension==1', {
         'defines': ['FILE_MANAGER_EXTENSION=1'],
       }],
       ['webui_task_manager==1', {
         'defines': ['WEBUI_TASK_MANAGER=1'],
       }],
       ['profiling==1', {
@@ skipping 1229 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }