Temporarily disable context idle cleanup.

cc/output/context_cache_controller.cc

 // Copyright (c) 2016 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/output/context_cache_controller.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "base/synchronization/lock.h"
@@ skipping 121 matching lines @@
                             current_idle_generation),
       base::TimeDelta::FromSeconds(kIdleCleanupDelaySeconds));
 }
 
 void ContextCacheController::InvalidatePendingIdleCallbacks() {
   base::AutoLock hold(current_idle_generation_lock_);
   ++current_idle_generation_;
 }
 
 void ContextCacheController::OnIdle(uint32_t idle_generation) {
+// TODO(ericrk): Temporarily disabling this to investigate whether this
+// code regressed scroll latency on Android. crbug.com/664181
+#if defined(OS_ANDROID)
+  return;
+#endif
+
   // First check if we should run our idle callback at all. If we have become
   // busy since scheduling, just schedule another idle callback and return.
   {
     base::AutoLock hold(current_idle_generation_lock_);
     if (current_idle_generation_ != idle_generation) {
       PostIdleCallback(current_idle_generation_);
       return;
     }
   }
 
@@ skipping 13 matching lines @@
   context_support_->SetAggressivelyFreeResources(true);
   context_support_->SetAggressivelyFreeResources(false);
 
   callback_pending_ = false;
 
   if (context_lock_)
     context_lock_->Release();
 }
 
 }  // namespace cc