Revert of cc: Remove use of PassAs() and constructor-casting with scoped_ptr.

cc/trees/thread_proxy.cc

 // Copyright 2011 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.
 
 #include "cc/trees/thread_proxy.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/auto_reset.h"
@@ skipping 31 matching lines @@
 
 struct ThreadProxy::SchedulerStateRequest {
   CompletionEvent completion;
   scoped_ptr<base::Value> state;
 };
 
 scoped_ptr<Proxy> ThreadProxy::Create(
     LayerTreeHost* layer_tree_host,
     scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
     scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner) {
-  return make_scoped_ptr(
-      new ThreadProxy(layer_tree_host, main_task_runner, impl_task_runner));
+  return make_scoped_ptr(new ThreadProxy(layer_tree_host,
+                                         main_task_runner,
+                                         impl_task_runner)).PassAs<Proxy>();
 }
 
 ThreadProxy::ThreadProxy(
     LayerTreeHost* layer_tree_host,
     scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
     scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner)
     : Proxy(main_task_runner, impl_task_runner),
       main_thread_only_vars_unsafe_(this, layer_tree_host->id()),
       main_thread_or_blocked_vars_unsafe_(layer_tree_host),
       compositor_thread_vars_unsafe_(
@@ skipping 891 matching lines @@
 
 void ThreadProxy::ScheduledActionCommit() {
   TRACE_EVENT0("cc", "ThreadProxy::ScheduledActionCommit");
   DCHECK(IsImplThread());
   DCHECK(IsMainThreadBlocked());
   DCHECK(impl().commit_completion_event);
   DCHECK(impl().current_resource_update_controller);
 
   // Complete all remaining texture updates.
   impl().current_resource_update_controller->Finalize();
-  impl().current_resource_update_controller = nullptr;
+  impl().current_resource_update_controller.reset();
 
   if (impl().animations_frozen_until_next_draw) {
     impl().animation_time = std::max(
         impl().animation_time, blocked_main().last_monotonic_frame_begin_time);
   }
   impl().did_commit_after_animating = true;
 
   blocked_main().main_thread_inside_commit = true;
   impl().layer_tree_host_impl->BeginCommit();
   layer_tree_host()->BeginCommitOnImplThread(impl().layer_tree_host_impl.get());
@@ skipping 265 matching lines @@
   }
   completion->Signal();
 }
 
 void ThreadProxy::LayerTreeHostClosedOnImplThread(CompletionEvent* completion) {
   TRACE_EVENT0("cc", "ThreadProxy::LayerTreeHostClosedOnImplThread");
   DCHECK(IsImplThread());
   DCHECK(IsMainThreadBlocked());
   layer_tree_host()->DeleteContentsTexturesOnImplThread(
       impl().layer_tree_host_impl->resource_provider());
-  impl().current_resource_update_controller = nullptr;
+  impl().current_resource_update_controller.reset();
   impl().layer_tree_host_impl->SetNeedsBeginFrame(false);
-  impl().scheduler = nullptr;
-  impl().layer_tree_host_impl = nullptr;
+  impl().scheduler.reset();
+  impl().layer_tree_host_impl.reset();
   impl().weak_factory.InvalidateWeakPtrs();
   // We need to explicitly cancel the notifier, since it isn't using weak ptrs.
   // TODO(vmpstr): We should see if we can make it use weak ptrs and still keep
   // the convention of having a weak ptr factory initialized last. Alternatively
   // we should moved the notifier (and RenewTreePriority) to LTHI. See
   // crbug.com/411972
   impl().smoothness_priority_expiration_notifier.Cancel();
   impl().contents_texture_manager = NULL;
   completion->Signal();
 }
@@ skipping 135 matching lines @@
 
   impl().timing_history.DidActivateSyncTree();
 }
 
 void ThreadProxy::DidManageTiles() {
   DCHECK(IsImplThread());
   impl().scheduler->DidManageTiles();
 }
 
 }  // namespace cc