Update from chromium https://crrev.com/301315

base/BUILD.gn

 # Copyright (c) 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.
 
 import("//build/config/ui.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
 
@@ skipping 311 matching lines @@
     "memory/aligned_memory.h",
     "memory/discardable_memory.cc",
     "memory/discardable_memory.h",
     "memory/discardable_memory_android.cc",
     "memory/discardable_memory_emulated.cc",
     "memory/discardable_memory_emulated.h",
     "memory/discardable_memory_linux.cc",
     "memory/discardable_memory_mac.cc",
     "memory/discardable_memory_manager.cc",
     "memory/discardable_memory_manager.h",
+    "memory/discardable_memory_shmem.cc",
+    "memory/discardable_memory_shmem.h",
+    "memory/discardable_memory_shmem_allocator.cc",
+    "memory/discardable_memory_shmem_allocator.h",
     "memory/discardable_memory_win.cc",
+    "memory/discardable_shared_memory.cc",
+    "memory/discardable_shared_memory.h",
     "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",
     "memory/ref_counted_delete_on_message_loop.h",
     "memory/ref_counted_memory.cc",
     "memory/ref_counted_memory.h",
@@ skipping 835 matching lines @@
     "mac/libdispatch_task_runner_unittest.cc",
     "mac/mac_util_unittest.mm",
     "mac/objc_property_releaser_unittest.mm",
     "mac/scoped_nsobject_unittest.mm",
     "mac/scoped_objc_class_swizzler_unittest.mm",
     "mac/scoped_sending_event_unittest.mm",
     "md5_unittest.cc",
     "memory/aligned_memory_unittest.cc",
     "memory/discardable_memory_manager_unittest.cc",
     "memory/discardable_memory_unittest.cc",
+    "memory/discardable_shared_memory_unittest.cc",
     "memory/linked_ptr_unittest.cc",
     "memory/ref_counted_memory_unittest.cc",
     "memory/ref_counted_unittest.cc",
     "memory/scoped_ptr_unittest.cc",
     "memory/scoped_ptr_unittest.nc",
     "memory/scoped_vector_unittest.cc",
     "memory/shared_memory_unittest.cc",
     "memory/singleton_unittest.cc",
     "memory/weak_ptr_unittest.cc",
     "memory/weak_ptr_unittest.nc",
@@ skipping 290 matching lines @@
   # GYP: //base.gyp:base_unittests_apk
   unittest_apk("base_unittests_apk") {
     deps = [
       ":base_java",
       ":base_java_unittest_support",
       ":base_unittests",
     ]
     unittests_dep = ":base_unittests"
   }
 }