GYP changes and scripts for compiling Skia for ChromeOS

gyp/common.gypi

 # Copyright 2011 The Android Open Source Project
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 #
 # This file is automatically included by gyp_skia when building any target.
 
 {
   'includes': [
     'common_variables.gypi',
@@ skipping 19 matching lines @@
         }],
         [ 'skia_angle and not skia_os == "win"', {
           'error': '<!(skia_angle=1 only supported with skia_os="win".)',
         }],
         [ 'skia_arch_width != 32 and skia_arch_width != 64', {
           'error': '<!(skia_arch_width can only be 32 or 64 bits not <(skia_arch_width) bits)',
         }],
         [ 'skia_os == "nacl" and OS != "linux"', {
           'error': '<!(Skia NaCl build only currently supported on Linux.)',
         }],
+        [ 'skia_os == "chromeos" and OS != "linux"', {
+          'error': '<!(Skia ChromeOS build is only supported on Linux.)',
+        }],
       ],
     },
     # Validate the 'skia_os' setting against 'skia_shared_lib', because shared
     # library build is only supported on Android.
     'variables': {
       'conditions': [
         [ 'skia_os != "android" and skia_shared_lib', {
           'error': '<!(Skia shared lib build only currently supported on Android.)',
         }],
       ],
@@ skipping 64 matching lines @@
         ],
       },
     },
   }, # end 'target_defaults'
 }
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