Make RenderPass::Id an isolated class

cc/layers/layer_impl.cc

 // Copyright 2012 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/layers/layer_impl.h"
 
 #include "base/debug/trace_event.h"
 #include "base/debug/trace_event_argument.h"
 #include "base/json/json_reader.h"
 #include "base/strings/stringprintf.h"
@@ skipping 321 matching lines @@
 }
 
 bool LayerImpl::HasDelegatedContent() const {
   return false;
 }
 
 bool LayerImpl::HasContributingDelegatedRenderPasses() const {
   return false;
 }
 
-RenderPass::Id LayerImpl::FirstContributingRenderPassId() const {
-  return RenderPass::Id(0, 0);
+RenderPassId LayerImpl::FirstContributingRenderPassId() const {
+  return RenderPassId(0, 0);
 }
 
-RenderPass::Id LayerImpl::NextContributingRenderPassId(RenderPass::Id id)
-    const {
-  return RenderPass::Id(0, 0);
+RenderPassId LayerImpl::NextContributingRenderPassId(RenderPassId id) const {
+  return RenderPassId(0, 0);
 }
 
 ResourceProvider::ResourceId LayerImpl::ContentsResourceId() const {
   NOTREACHED();
   return 0;
 }
 
 void LayerImpl::SetSentScrollDelta(const gfx::Vector2d& sent_scroll_delta) {
   // Pending tree never has sent scroll deltas
   DCHECK(layer_tree_impl()->IsActiveTree());
@@ skipping 1176 matching lines @@
 }
 
 void LayerImpl::NotifyAnimationFinished(
     base::TimeTicks monotonic_time,
     Animation::TargetProperty target_property) {
   if (target_property == Animation::ScrollOffset)
     layer_tree_impl_->InputScrollAnimationFinished();
 }
 
 }  // namespace cc