compositor-worker: cc->blink mutation plumbing

blimp/client/compositor/blimp_compositor.cc

Index: blimp/client/compositor/blimp_compositor.cc
diff --git a/blimp/client/compositor/blimp_compositor.cc b/blimp/client/compositor/blimp_compositor.cc
index 6fdbe346f2a9d4dea28d9c5086b670c152df5dbd..6e754760b2d6b0f072b2de3f317ab95c170164cd 100644
--- a/blimp/client/compositor/blimp_compositor.cc
+++ b/blimp/client/compositor/blimp_compositor.cc
@@ -19,6 +19,7 @@
 #include "blimp/client/compositor/test/dummy_layer_driver.h"
 #include "blimp/client/session/render_widget_feature.h"
 #include "blimp/common/compositor/blimp_task_graph_runner.h"
+#include "cc/animation/layer_tree_mutations.h"
 #include "cc/layers/layer.h"
 #include "cc/layers/layer_settings.h"
 #include "cc/output/output_surface.h"
@@ -149,6 +150,8 @@ void BlimpCompositor::ApplyViewportDeltas(
     float page_scale,
     float top_controls_delta) {}
 
+void BlimpCompositor::ApplyMutations(const cc::LayerTreeMutations& mutations) {}
+
 void BlimpCompositor::RequestNewOutputSurface() {
   output_surface_request_pending_ = true;
   HandlePendingOutputSurfaceRequest();