Revert of Read compositor VSync information from platform, when possible (https://chromiumcodereview.appspot.com/138903025/)

Reason for revert:
Reverting due to Windows crashes.  See:

http://crbug.com/343199

Original issue's description:
> Read compositor VSync information from platform, when possible
> 
> The current query of VSync information through the GL context can be unreliable
> on platforms that can dynamically disable vblanks, or multi-monitor setups.
> Preferentially query the VSync information through the platform windowing
> system (presently: XRandR on CrOS) when possible.
> 
> BUG=328953
> TEST=local build, run on CrOS snow
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=250250

TBR=oshima@chromium.org,piman@chromium.org,brianderson@chromium.org,sky@chromium.org,mukai@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=328953

Review URL: https://codereview.chromium.org/161413002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@250798 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 0 insertions, 63 deletions

diff --git a/ui/compositor/compositor_vsync_manager.cc b/ui/compositor/compositor_vsync_manager.cc
deleted file mode 100644
index 1a10d4a..0000000
--- a/ui/compositor/compositor_vsync_manager.cc
+++ /dev/null
@@ -1,63 +0,0 @@
-// Copyright 2014 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 "ui/compositor/compositor_vsync_manager.h"
-
-namespace ui {
-
-CompositorVSyncManager::CompositorVSyncManager()
-    : observer_list_(new ObserverListThreadSafe<Observer>()),
-      authoritative_vsync_interval_(base::TimeDelta::FromSeconds(0)) {}
-
-CompositorVSyncManager::~CompositorVSyncManager() {}
-
-void CompositorVSyncManager::SetAuthoritativeVSyncInterval(
-    base::TimeDelta interval) {
-  base::TimeTicks timebase;
-  {
-    base::AutoLock lock(vsync_parameters_lock_);
-    timebase = last_timebase_;
-    authoritative_vsync_interval_ = interval;
-    last_interval_ = interval;
-  }
-  NotifyObservers(timebase, interval);
-}
-
-void CompositorVSyncManager::UpdateVSyncParameters(base::TimeTicks timebase,
-                                                   base::TimeDelta interval) {
-  {
-    base::AutoLock lock(vsync_parameters_lock_);
-    if (authoritative_vsync_interval_ != base::TimeDelta::FromSeconds(0))
-      interval = authoritative_vsync_interval_;
-    last_timebase_ = timebase;
-    last_interval_ = interval;
-  }
-  NotifyObservers(timebase, interval);
-}
-
-void CompositorVSyncManager::AddObserver(Observer* observer) {
-  base::TimeTicks timebase;
-  base::TimeDelta interval;
-  {
-    base::AutoLock lock(vsync_parameters_lock_);
-    timebase = last_timebase_;
-    interval = last_interval_;
-  }
-  observer_list_->AddObserver(observer);
-  observer->OnUpdateVSyncParameters(timebase, interval);
-}
-
-void CompositorVSyncManager::RemoveObserver(Observer* observer) {
-  observer_list_->RemoveObserver(observer);
-}
-
-void CompositorVSyncManager::NotifyObservers(base::TimeTicks timebase,
-                                             base::TimeDelta interval) {
-  observer_list_->Notify(
-      &CompositorVSyncManager::Observer::OnUpdateVSyncParameters,
-      timebase,
-      interval);
-}
-
-}  // namespace ui