chromeos/aura: Handle power button on unofficial hardware.

build/common.gypi

 # Copyright (c) 2012 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 624 matching lines @@
     'build_webkit_exes_from_webkit_gyp%': 1,
 
     # This flag is only used when disable_nacl==0 and disables all those
     # subcomponents which would require the installation of a native_client
     # untrusted toolchain.
     'disable_nacl_untrusted%': 0,
 
     # Disable Dart by default.
     'enable_dart%': 0,
 
+    # (Most) Chrome OS hardware reports ACPI power button releases correctly.
+    # Standard hardware reports releases immediately after presses.
+    'chromeos_legacy_power_button%': 0,
+
     'conditions': [
       # Used to disable Native Client at compile time, for platforms where it
       # isn't supported (ARM)
       ['target_arch=="arm" and chromeos == 1', {
         'disable_nacl%': 1,
        }, {
         'disable_nacl%': 0,
       }],
       ['os_posix==1 and OS!="mac" and OS!="android"', {
         # This will set gcc_version to XY if you are running gcc X.Y.*.
@@ skipping 378 matching lines @@
         'defines': ['TOOLKIT_USES_GTK=1'],
       }],
       ['toolkit_uses_gtk==1 and toolkit_views==0', {
         # TODO(erg): We are progressively sealing up use of deprecated features
         # in gtk in preparation for an eventual porting to gtk3.
         'defines': ['GTK_DISABLE_SINGLE_INCLUDES=1'],
       }],
       ['chromeos==1', {
         'defines': ['OS_CHROMEOS=1'],
       }],
+      ['chromeos_legacy_power_button==1', {
+        'defines': ['CHROMEOS_LEGACY_POWER_BUTTON=1'],
+      }],
       ['use_virtual_keyboard==1', {
         'defines': ['USE_VIRTUAL_KEYBOARD=1'],
       }],
       ['use_xi2_mt!=0', {
         'defines': ['USE_XI2_MT=<(use_xi2_mt)'],
       }],
       ['use_wayland==1', {
         'defines': ['USE_WAYLAND=1', 'WL_EGL_PLATFORM=1'],
       }],
       ['file_manager_extension==1', {
@@ skipping 1727 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',
   },
 }