Add use_allocator instead of linux_use_tcmalloc to switch the allocator.

ash/ash.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
     'grit_out_dir': '<(SHARED_INTERMEDIATE_DIR)/chrome',
   },
   'includes': [
@@ skipping 1008 matching lines @@
             '../chromeos/chromeos.gyp:power_manager_proto',
           ],
           'sources': [
             'first_run/first_run_helper_unittest.cc',
           ],
         }, { # else: chromeos!=1
           'sources/': [
             ['exclude', 'display/resolution_notification_controller_unittest.cc'],
           ],
         }],
-        ['OS=="linux" and component=="shared_library" and linux_use_tcmalloc==1', {
+        # TODO(dmikurube): Kill linux_use_tcmalloc. http://crbug.com/345554

[darin (slow to review), 2014/03/01 00:38:56]

maybe this GYP block would be better as a .gypi that other can include? there is
a lot of duplication of this snippet across the codebase.

[Dai Mikurube (NOT FULLTIME), 2014/03/01 01:01:19]

Sure. Maybe. But actually, it's not trivial since they have some differences per
platform and/or other conditions. I and primiano@ plan a gyp refactoring later
(discussed in the bug), but we need use_allocator earlier.

+        ['OS=="linux" and component=="shared_library" and ((use_allocator!="none" and use_allocator!="see_use_tcmalloc") or (use_allocator=="see_use_tcmalloc" and linux_use_tcmalloc==1))', {
           'dependencies': [
             '<(DEPTH)/base/allocator/allocator.gyp:allocator',
           ],
           'link_settings': {
             'ldflags': ['-rdynamic'],
           },
         }],
       ],
     },
     {
@@ skipping 73 matching lines @@
             },
           },
           'dependencies': [
             '../sandbox/sandbox.gyp:sandbox',
           ],
         }],
       ],
     },
   ],
 }