NOT FOR REVIEW

cc/trees/layer_tree_host_impl.cc

Index: cc/trees/layer_tree_host_impl.cc
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index c90087641c359b49dec6150e13fb4196a0eeed4c..159ee63100ad60c005efe5717278c147afd14023 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -17,6 +17,7 @@
 #include "base/stl_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/trace_event/trace_event_argument.h"
+#include "cc/animation/animation_host.h"
 #include "cc/animation/animation_id_provider.h"
 #include "cc/animation/scroll_offset_animation_curve.h"
 #include "cc/animation/scrollbar_animation_controller.h"
@@ -229,6 +230,11 @@ LayerTreeHostImpl::LayerTreeHostImpl(
       requires_high_res_to_draw_(false),
       is_likely_to_require_a_draw_(false),
       frame_timing_tracker_(FrameTimingTracker::Create()) {
+  if (settings.use_compositor_animation_timelines) {
+    animation_host_ = AnimationHost::Create(true);
+    animation_host_->SetLayerTreeMutatorsClient(this);
+  }
+
   DCHECK(proxy_->IsImplThread());
   DidVisibilityChange(this, visible_);
   animation_registrar_->set_supports_scroll_animations(
@@ -3380,4 +3386,115 @@ bool LayerTreeHostImpl::ScrollAnimationUpdateTarget(
 
   return true;
 }
+
+bool LayerTreeHostImpl::IsLayerInActiveTree(int layer_id) const {
+  return active_tree() ? active_tree()->LayerById(layer_id) != nullptr : false;
+}
+
+bool LayerTreeHostImpl::IsLayerInPendingTree(int layer_id) const {
+  if (pending_tree() && pending_tree()->LayerById(layer_id))
+    return true;
+  if (recycle_tree() && recycle_tree()->LayerById(layer_id))
+    return true;
+
+  return false;
+}
+
+void LayerTreeHostImpl::SetMutatorsNeedCommit() {
+  SetNeedsCommit();
+}
+
+void LayerTreeHostImpl::SetTreeLayerFilterMutated(
+    int layer_id,
+    LayerTreeImpl* tree,
+    const FilterOperations& filters) {
+  if (!tree)
+    return;
+
+  LayerAnimationValueObserver* layer = tree->LayerById(layer_id);
+  if (layer)
+    layer->OnFilterAnimated(filters);
+}
+
+void LayerTreeHostImpl::SetTreeLayerOpacityMutated(int layer_id,
+                                                   LayerTreeImpl* tree,
+                                                   float opacity) {
+  if (!tree)
+    return;
+
+  LayerAnimationValueObserver* layer = tree->LayerById(layer_id);
+  if (layer)
+    layer->OnOpacityAnimated(opacity);
+}
+
+void LayerTreeHostImpl::SetTreeLayerTransformMutated(
+    int layer_id,
+    LayerTreeImpl* tree,
+    const gfx::Transform& transform) {
+  if (!tree)
+    return;
+
+  LayerAnimationValueObserver* layer = tree->LayerById(layer_id);
+  if (layer)
+    layer->OnTransformAnimated(transform);
+}
+
+void LayerTreeHostImpl::SetTreeLayerScrollOffsetMutated(
+    int layer_id,
+    LayerTreeImpl* tree,
+    const gfx::ScrollOffset& scroll_offset) {
+  if (!tree)
+    return;
+
+  LayerAnimationValueObserver* layer = tree->LayerById(layer_id);
+  if (layer)
+    layer->OnScrollOffsetAnimated(scroll_offset);
+}
+
+void LayerTreeHostImpl::SetLayerFilterMutated(int layer_id,
+                                              bool affects_active_tree,
+                                              const FilterOperations& filters) {
+  if (affects_active_tree) {
+    SetTreeLayerFilterMutated(layer_id, active_tree(), filters);
+  } else {
+    SetTreeLayerFilterMutated(layer_id, pending_tree(), filters);
+    SetTreeLayerFilterMutated(layer_id, recycle_tree(), filters);
+  }
+}
+
+void LayerTreeHostImpl::SetLayerOpacityMutated(int layer_id,
+                                               bool affects_active_tree,
+                                               float opacity) {
+  if (affects_active_tree) {
+    SetTreeLayerOpacityMutated(layer_id, active_tree(), opacity);
+  } else {
+    SetTreeLayerOpacityMutated(layer_id, pending_tree(), opacity);
+    SetTreeLayerOpacityMutated(layer_id, recycle_tree(), opacity);
+  }
+}
+
+void LayerTreeHostImpl::SetLayerTransformMutated(
+    int layer_id,
+    bool affects_active_tree,
+    const gfx::Transform& transform) {
+  if (affects_active_tree) {
+    SetTreeLayerTransformMutated(layer_id, active_tree(), transform);
+  } else {
+    SetTreeLayerTransformMutated(layer_id, pending_tree(), transform);
+    SetTreeLayerTransformMutated(layer_id, recycle_tree(), transform);
+  }
+}
+
+void LayerTreeHostImpl::SetLayerScrollOffsetMutated(
+    int layer_id,
+    bool affects_active_tree,
+    const gfx::ScrollOffset& scroll_offset) {
+  if (affects_active_tree) {
+    SetTreeLayerScrollOffsetMutated(layer_id, active_tree(), scroll_offset);
+  } else {
+    SetTreeLayerScrollOffsetMutated(layer_id, pending_tree(), scroll_offset);
+    SetTreeLayerScrollOffsetMutated(layer_id, recycle_tree(), scroll_offset);
+  }
+}
+
 }  // namespace cc