old_contents: # Copyright 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.
  
  """A module for the basic architectures supported by cr."""
  
  import cr
  
  DEFAULT = cr.Config.From(
      CR_ENVSETUP_ARCH='{CR_ARCH}',
  )
  
  
  class Arch(cr.Plugin, cr.Plugin.Type):
    """Base class for implementing cr architecture targets."""
  
    SELECTOR = 'CR_ARCH'
  
    @classmethod
    def AddArguments(cls, parser):
      parser.add_argument(
          '--architecture', dest=cls.SELECTOR,
          choices=cls.Choices(),
          default=None,
          help='Sets the target architecture to use. Overrides ' + cls.SELECTOR
      )
  
  
  class IA32Arch(Arch):
  
    ACTIVE = cr.Config.From(
        CR_ENVSETUP_ARCH='ia32',
    )
  
  
  class Mips32Arch(Arch):
  
    ACTIVE = cr.Config.From(
        CR_ENVSETUP_ARCH='mipsel',
    )
  
    @property
    def enabled(self):
      return cr.AndroidPlatform.GetInstance().is_active
  
  
  class X64Arch(Arch):
  
    ACTIVE = cr.Config.From(
        CR_ENVSETUP_ARCH='x64',
    )
  
    @property
    def priority(self):
      return super(X64Arch, self).priority + 1
  
  
  class Arm32Arch(Arch):
  
    ACTIVE = cr.Config.From(
        CR_ENVSETUP_ARCH='arm',
    )
  
    @property
    def priority(self):
      return super(Arm32Arch, self).priority + 2
  
    @property
    def enabled(self):
      return cr.AndroidPlatform.GetInstance().is_active
  
new_contents: # Copyright 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.
  
  """A module for the basic architectures supported by cr."""
  
  import cr
  
  DEFAULT = cr.Config.From(
      CR_ENVSETUP_ARCH='{CR_ARCH}',
  )
  
  
  class Arch(cr.Plugin, cr.Plugin.Type):
    """Base class for implementing cr architecture targets."""
  
    SELECTOR = 'CR_ARCH'
  
    @classmethod
    def AddArguments(cls, parser):
      parser.add_argument(
          '--architecture', dest=cls.SELECTOR,
          choices=cls.Choices(),
          default=None,
          help='Sets the target architecture to use. Overrides ' + cls.SELECTOR
      )
  
  
  class IA32Arch(Arch):
  
    ACTIVE = cr.Config.From(
        CR_ENVSETUP_ARCH='ia32',
    )
  
  
  class Mips32Arch(Arch):
  
    ACTIVE = cr.Config.From(
        CR_ENVSETUP_ARCH='mipsel',
    )
  
    @property
    def enabled(self):
      return cr.AndroidPlatform.GetInstance().is_active
  
  
  class X64Arch(Arch):
  
    ACTIVE = cr.Config.From(
        CR_ENVSETUP_ARCH='x64',
    )
  
    @property
    def priority(self):
      return super(X64Arch, self).priority + 1
  
  
  class Arm32Arch(Arch):
  
    ACTIVE = cr.Config.From(
        CR_ENVSETUP_ARCH='arm',
    )
  
    @property
    def priority(self):
      return super(Arm32Arch, self).priority + 2
  
    @property
    def enabled(self):
      return cr.AndroidPlatform.GetInstance().is_active
  
  
  class Arm64Arch(Arch):
  
    ACTIVE = cr.Config.From(
        CR_ENVSETUP_ARCH='arm64',
    )
  
    @property
    def enabled(self):
      return cr.AndroidPlatform.GetInstance().is_active
  
subject: Add support for arm64 as a CR architecture.