Adds MemoryPressureListener.

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 36 matching lines @@
           'android/jni_android.cc',
           'android/jni_android.h',
           'android/jni_array.cc',
           'android/jni_array.h',
           'android/jni_helper.cc',
           'android/jni_helper.h',
           'android/jni_registrar.cc',
           'android/jni_registrar.h',
           'android/jni_string.cc',
           'android/jni_string.h',
+          'android/memory_pressure_android.cc',
+          'android/memory_pressure_android.h',
           'android/path_service_android.cc',
           'android/path_service_android.h',
           'android/path_utils.cc',
           'android/path_utils.h',
           'android/thread_utils.h',
           'at_exit.cc',
           'at_exit.h',
           'atomic_ref_count.h',
           'atomic_sequence_num.h',
           'atomicops.h',
@@ skipping 192 matching lines @@
           '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_android.cc',
           'memory/discardable_memory_mac.cc',
           'memory/linked_ptr.h',
           'memory/manual_constructor.h',
+          'memory/memory_pressure.cc',
+          'memory/memory_pressure.h',
           'memory/raw_scoped_refptr_mismatch_checker.h',
           'memory/ref_counted.cc',
           'memory/ref_counted.h',
           'memory/ref_counted_memory.cc',
           'memory/ref_counted_memory.h',
           'memory/scoped_handle.h',
           'memory/scoped_nsobject.h',
           'memory/scoped_open_process.h',
           'memory/scoped_policy.h',
           'memory/scoped_ptr.h',
@@ skipping 552 matching lines @@
           ['<(use_system_nspr)==1 and >(nacl_untrusted_build)==0', {
             'sources/': [
               ['exclude', '^third_party/nspr/'],
             ],
           }],
         ],
       }],
     ],
   },
 }