Reland of cc: Remove frame queuing from the scheduler.

cc/trees/proxy_impl.cc

 // Copyright 2015 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/proxy_impl.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/auto_reset.h"
@@ skipping 82 matching lines @@
 
 ProxyImpl::BlockedMainCommitOnly::~BlockedMainCommitOnly() {}
 
 ProxyImpl::~ProxyImpl() {
   TRACE_EVENT0("cc", "ProxyImpl::~ProxyImpl");
   DCHECK(IsImplThread());
   DCHECK(IsMainThreadBlocked());
 
   // Take away the CompositorFrameSink before destroying things so it doesn't
   // try to call into its client mid-shutdown.
-  scheduler_->DidLoseCompositorFrameSink();
   layer_tree_host_impl_->ReleaseCompositorFrameSink();

[enne (OOO), 2016/09/21 17:38:55]

It's a little odd that single thread proxy now calls did lose compositor frame
sink but proxy impl doesn't.  Does this cause any issues?  Should the single
thread proxy one not do that as well?

[sunnyps, 2016/09/24 01:15:01]

This is LTHI::ReleaseCFS not Scheduler::DidLoseCFS which was removed. Both STP
and ProxyImpl only call ReleaseCFS. There's no need to call DidLoseCFS because
the scheduler isn't expected to do anything at this point.

-
   scheduler_ = nullptr;
   external_begin_frame_source_ = nullptr;
   layer_tree_host_impl_ = nullptr;
   // We need to explicitly shutdown the notifier to destroy any weakptrs it is
   // holding while still on the compositor thread. This also ensures any
   // callbacks holding a ProxyImpl pointer are cancelled.
   smoothness_priority_expiration_notifier_.Shutdown();
 }
 
 void ProxyImpl::InitializeMutatorOnImpl(
@@ skipping 496 matching lines @@
 bool ProxyImpl::IsMainThreadBlocked() const {
   return task_runner_provider_->IsMainThreadBlocked();
 }
 
 ProxyImpl::BlockedMainCommitOnly& ProxyImpl::blocked_main_commit() {
   DCHECK(IsMainThreadBlocked() && commit_completion_event_);
   return main_thread_blocked_commit_vars_unsafe_;
 }
 
 }  // namespace cc