Add DiscardableMemoryAllocator to work around FD limit issue.

base/base.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.
 
 {
   'target_defaults': {
     'variables': {
       'base_target': 0,
     },
     'target_conditions': [
@@ skipping 269 matching lines @@
           'mac/scoped_nsexception_enabler.h',
           'mac/scoped_nsexception_enabler.mm',
           'mac/scoped_nsobject.h',
           'mac/scoped_sending_event.h',
           'mac/scoped_sending_event.mm',
           'mac/sdk_forward_declarations.h',
           'memory/aligned_memory.cc',
           'memory/aligned_memory.h',
           'memory/discardable_memory.cc',
           'memory/discardable_memory.h',
+          'memory/discardable_memory_allocator.cc',
+          'memory/discardable_memory_allocator.h',
+          'memory/discardable_memory_allocator_android.cc',
           'memory/discardable_memory_android.cc',
           'memory/discardable_memory_android.h',
           'memory/discardable_memory_mac.cc',
           'memory/linked_ptr.h',
           'memory/manual_constructor.h',
           'memory/memory_pressure_listener.cc',
           'memory/memory_pressure_listener.h',
           'memory/raw_scoped_refptr_mismatch_checker.h',
           'memory/ref_counted.cc',
           'memory/ref_counted.h',
@@ skipping 616 matching lines @@
           ['<(toolkit_uses_gtk) == 1', {
             'sources!': [
               'x11/x11_error_tracker.cc',
             ],
           }],
         ],
       }],
     ],
   },
 }