WIP - compositor worker mega patch.

cc/trees/layer_tree_host.cc

Index: cc/trees/layer_tree_host.cc
diff --git a/cc/trees/layer_tree_host.cc b/cc/trees/layer_tree_host.cc
index 70740935217a4482d62abd598cb54e879017a7d4..8ea7fbb4f8770a7b5cf4ba6e7a0dc8d86bd4dff9 100644
--- a/cc/trees/layer_tree_host.cc
+++ b/cc/trees/layer_tree_host.cc
@@ -542,7 +542,6 @@ bool LayerTreeHost::BeginMainFrameRequested() const {
   return proxy_->BeginMainFrameRequested();
 }
 
-
 void LayerTreeHost::SetNextCommitWaitsForActivation() {
   proxy_->SetNextCommitWaitsForActivation();
 }
@@ -604,10 +603,8 @@ void LayerTreeHost::SetHasGpuRasterizationTrigger(bool has_trigger) {
     return;
 
   has_gpu_rasterization_trigger_ = has_trigger;
-  TRACE_EVENT_INSTANT1("cc",
-                       "LayerTreeHost::SetHasGpuRasterizationTrigger",
-                       TRACE_EVENT_SCOPE_THREAD,
-                       "has_trigger",
+  TRACE_EVENT_INSTANT1("cc", "LayerTreeHost::SetHasGpuRasterizationTrigger",
+                       TRACE_EVENT_SCOPE_THREAD, "has_trigger",
                        has_gpu_rasterization_trigger_);
 }
 
@@ -677,12 +674,8 @@ void LayerTreeHost::StartPageScaleAnimation(const gfx::Vector2d& target_offset,
                                             bool use_anchor,
                                             float scale,
                                             base::TimeDelta duration) {
-  pending_page_scale_animation_.reset(
-      new PendingPageScaleAnimation(
-          target_offset,
-          use_anchor,
-          scale,
-          duration));
+  pending_page_scale_animation_.reset(new PendingPageScaleAnimation(
+      target_offset, use_anchor, scale, duration));
 
   SetNeedsCommit();
 }
@@ -851,9 +844,8 @@ void LayerTreeHost::ApplyScrollAndScale(ScrollAndScaleSet* info) {
       } else if (layer == inner_viewport_scroll_layer_.get()) {
         inner_viewport_scroll_delta += info->scrolls[i].scroll_delta;
       } else {
-        layer->SetScrollOffsetFromImplSide(
-            gfx::ScrollOffsetWithDelta(layer->scroll_offset(),
-                                       info->scrolls[i].scroll_delta));
+        layer->SetScrollOffsetFromImplSide(gfx::ScrollOffsetWithDelta(
+            layer->scroll_offset(), info->scrolls[i].scroll_delta));
       }
       SetNeedsUpdateLayers();
     }
@@ -891,6 +883,13 @@ void LayerTreeHost::ApplyScrollAndScale(ScrollAndScaleSet* info) {
   }
 }
 
+void LayerTreeHost::ApplyMutations(LayerTreeMutationMap* mutations) {
+  if (mutations) {
+    TRACE_EVENT0("compositor-worker", "LayerTreeHost::ApplyMutations");
+    client_->ApplyMutations(*mutations);
+  }
+}
+
 void LayerTreeHost::SetDeviceScaleFactor(float device_scale_factor) {
   if (device_scale_factor == device_scale_factor_)
     return;
@@ -967,8 +966,7 @@ void LayerTreeHost::DeleteUIResource(UIResourceId uid) {
 
 void LayerTreeHost::RecreateUIResources() {
   for (UIResourceClientMap::iterator iter = ui_resource_client_map_.begin();
-       iter != ui_resource_client_map_.end();
-       ++iter) {
+       iter != ui_resource_client_map_.end(); ++iter) {
     UIResourceId uid = iter->first;
     const UIResourceClientData& data = iter->second;
     bool resource_lost = true;
@@ -1082,6 +1080,11 @@ void LayerTreeHost::RecordFrameTimingEvents(
                                    std::move(main_frame_events));
 }
 
+void LayerTreeHost::SetLayerTreeMutator(LayerTreeMutator* mutator) {
+  TRACE_EVENT0("compositor-worker", "LayerTreeHost::SetLayerTreeMutator");
+  proxy_->SetMutator(mutator);
+}
+
 Layer* LayerTreeHost::LayerById(int id) const {
   LayerIdMap::const_iterator iter = layer_id_map_.find(id);
   return iter != layer_id_map_.end() ? iter->second : NULL;