Add support for WeakPtr<T>

webrtc/base/BUILD.gn

 # Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import("//build/config/crypto.gni")
 import("//build/config/ui.gni")
@@ skipping 192 matching lines @@
 
 rtc_static_library("rtc_task_queue") {
   public_deps = [
     ":rtc_base_approved",
   ]
 
   sources = [
     "sequenced_task_checker.h",
     "sequenced_task_checker_impl.cc",
     "sequenced_task_checker_impl.h",
+    "weak_ptr.cc",
+    "weak_ptr.h",
   ]
 
   if (build_with_chromium) {
     sources += [
       "../../webrtc_overrides/webrtc/base/task_queue.cc",
       "../../webrtc_overrides/webrtc/base/task_queue.h",
     ]
     include_dirs = [ "../../webrtc_overrides" ]
   } else {
     sources += [
@@ skipping 517 matching lines @@
       "java/src/org/webrtc/Logging.java",
       "java/src/org/webrtc/Size.java",
       "java/src/org/webrtc/ThreadUtils.java",
     ]
 
     deps = [
       "//base:base_java",
     ]
   }
 }