patch from chinmaygarde@ to make progress on mac, ios.

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")
 import("//testing/test.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
 
 config("base_implementation") {
   defines = [ "BASE_IMPLEMENTATION" ]
+
+  if (is_ios) {
+    # base uses routines deprecated in iOS 8
+    cflags = [ "-Wno-deprecated-declarations" ]
+  }
 }
 
 if (is_win) {
   # This is in a separate config so the flags can be applied to dependents.
   # ldflags in GN aren't automatically inherited.
   config("base_win_linker_flags") {
     ldflags = [
       "/DELAYLOAD:cfgmgr32.dll",
       "/DELAYLOAD:powrprof.dll",
       "/DELAYLOAD:setupapi.dll",
@@ skipping 612 matching lines @@
     "win/startup_information.h",
     "win/win_util.cc",
     "win/win_util.h",
     "win/windows_version.cc",
     "win/windows_version.h",
     "win/wrapped_window_proc.cc",
     "win/wrapped_window_proc.h",
   ]
 
   if (is_ios) {
-    sources += [ "process/memory_stubs.cc" ]
     sources -= [
       "message_loop/message_pump_libevent.cc",
       "message_loop/message_pump_libevent.h",
     ]
 
     set_sources_assignment_filter([])
     sources += [ "files/file_path_watcher_mac.cc" ]
     set_sources_assignment_filter(sources_assignment_filter)
   }
 
@@ skipping 802 matching lines @@
       ":base_java_unittest_support",
     ]
 
     # TODO(brettw) I think this should not be here, we should not be using
     # isolate files.
     isolate_file = "base_unittests.isolate"
   }
 
   if (is_ios) {
     sources -= [
+      "memory/discardable_shared_memory_unittest.cc",
+      "memory/shared_memory_unittest.cc",
       "process/memory_unittest.cc",
       "process/process_unittest.cc",
       "process/process_util_unittest.cc",
     ]
 
     # Pull in specific Mac files for iOS (which have been filtered out by file
     # name rules).
     set_sources_assignment_filter([])
     sources += [
       "mac/bind_objc_block_unittest.mm",
       "mac/foundation_util_unittest.mm",
       "mac/objc_property_releaser_unittest.mm",
       "mac/scoped_nsobject_unittest.mm",
-      "sys_string_conversions_mac_unittest.mm",
+      "strings/sys_string_conversions_mac_unittest.mm",
     ]
     set_sources_assignment_filter(sources_assignment_filter)
 
     # TODO(GYP): dep on copy_test_data_ios action.
   }
 
   if (is_linux) {
     sources -= [ "file_version_info_unittest.cc" ]
     sources += [ "nix/xdg_util_unittest.cc" ]
     deps += [ "//base/test:malloc_wrapper" ]
 
     if (use_glib) {
       configs += [ "//build/config/linux:glib" ]
     }
   }
 
   if (!is_linux || use_ozone) {
     sources -= [ "message_loop/message_pump_glib_unittest.cc" ]
   }
 
-  if (is_posix || is_ios) {
+  if (is_posix && !is_ios) {
     sources += [ "message_loop/message_pump_libevent_unittest.cc" ]
     deps += [ "//third_party/libevent" ]
   }
 
   if (is_android) {
     deps += [ "//testing/android/native_test:native_test_native_code" ]
     set_sources_assignment_filter([])
     sources += [ "debug/proc_maps_linux_unittest.cc" ]
     set_sources_assignment_filter(sources_assignment_filter)
   }
@@ skipping 131 matching lines @@
 
   # GYP: //base.gyp:base_java_unittest_support
   android_library("base_java_unittest_support") {
     deps = [
       ":base_java",
     ]
     java_files =
         [ "test/android/java/src/org/chromium/base/ContentUriTestUtils.java" ]
   }
 }