Revert "Implement scroll handler latency tracking"

cc/base/latency_info_swap_promise_monitor.cc

 // Copyright 2013 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/base/latency_info_swap_promise_monitor.h"
 
 #include "cc/base/latency_info_swap_promise.h"
 #include "cc/trees/layer_tree_host.h"
 #include "cc/trees/layer_tree_host_impl.h"
 #include "cc/trees/layer_tree_impl.h"
 
-namespace {
-
-bool AddRenderingScheduledComponent(ui::LatencyInfo* latency_info) {
-  if (latency_info->FindLatency(
-          ui::INPUT_EVENT_LATENCY_RENDERING_SCHEDULED_COMPONENT, 0, 0))
-    return false;
-  latency_info->AddLatencyNumber(
-      ui::INPUT_EVENT_LATENCY_RENDERING_SCHEDULED_COMPONENT, 0, 0);
-  return true;
-}
-
-}  // namespace
-
 namespace cc {
 
 LatencyInfoSwapPromiseMonitor::LatencyInfoSwapPromiseMonitor(
     ui::LatencyInfo* latency,
     LayerTreeHost* layer_tree_host,
     LayerTreeHostImpl* layer_tree_host_impl)
     : SwapPromiseMonitor(layer_tree_host, layer_tree_host_impl),
       latency_(latency) {}
 
 LatencyInfoSwapPromiseMonitor::~LatencyInfoSwapPromiseMonitor() {}
 
 void LatencyInfoSwapPromiseMonitor::OnSetNeedsCommitOnMain() {
-  if (AddRenderingScheduledComponent(latency_)) {
+  if (!latency_->FindLatency(
+          ui::INPUT_EVENT_LATENCY_RENDERING_SCHEDULED_COMPONENT, 0, 0)) {
+    latency_->AddLatencyNumber(
+        ui::INPUT_EVENT_LATENCY_RENDERING_SCHEDULED_COMPONENT, 0, 0);
     scoped_ptr<SwapPromise> swap_promise(new LatencyInfoSwapPromise(*latency_));
     layer_tree_host_->QueueSwapPromise(swap_promise.Pass());
   }
 }
 
 void LatencyInfoSwapPromiseMonitor::OnSetNeedsRedrawOnImpl() {
-  if (AddRenderingScheduledComponent(latency_)) {
+  if (!latency_->FindLatency(
+          ui::INPUT_EVENT_LATENCY_RENDERING_SCHEDULED_COMPONENT, 0, 0)) {
+    latency_->AddLatencyNumber(
+        ui::INPUT_EVENT_LATENCY_RENDERING_SCHEDULED_COMPONENT, 0, 0);
     scoped_ptr<SwapPromise> swap_promise(new LatencyInfoSwapPromise(*latency_));
     layer_tree_host_impl_->active_tree()->QueueSwapPromise(swap_promise.Pass());
   }
 }
 
-void LatencyInfoSwapPromiseMonitor::OnForwardScrollUpdateToMainThreadOnImpl() {
-  if (AddRenderingScheduledComponent(latency_)) {
-    scoped_ptr<SwapPromise> swap_promise(new LatencyInfoSwapPromise(*latency_));
-    layer_tree_host_impl_->QueueSwapPromiseForMainThreadScrollUpdate(
-        swap_promise.Pass());
-  }
-}
-
 }  // namespace cc