blimp: Set up the CompositorDependencies for blimp in Chrome.

blimp/client/core/compositor/blimp_compositor_dependencies.h

Index: blimp/client/core/compositor/blimp_compositor_dependencies.h
diff --git a/blimp/client/core/compositor/blimp_compositor_dependencies.h b/blimp/client/core/compositor/blimp_compositor_dependencies.h
index 2a68562187109557abe1e3102d73d0a26554d715..a05a5f6dd8bbfb8cffac6f532e5b3df8e0be22d4 100644
--- a/blimp/client/core/compositor/blimp_compositor_dependencies.h
+++ b/blimp/client/core/compositor/blimp_compositor_dependencies.h
@@ -16,6 +16,7 @@ class Thread;
 
 namespace cc {
 class ImageSerializationProcessor;
+class LayerTreeSettings;
 class TaskGraphRunner;
 }
 
@@ -42,6 +43,9 @@ class BlimpCompositorDependencies {
 
   cc::ImageSerializationProcessor* GetImageSerializationProcessor();
 
+  // TODO(xingliu): Get from the embedder when crbug.com/577985.
+  cc::LayerTreeSettings* GetLayerTreeSettings();
+
  private:
   std::unique_ptr<CompositorDependencies> embedder_dependencies_;
 
@@ -49,6 +53,8 @@ class BlimpCompositorDependencies {
   std::unique_ptr<base::Thread> compositor_impl_thread_;
   std::unique_ptr<cc::TaskGraphRunner> task_graph_runner_;
 
+  std::unique_ptr<cc::LayerTreeSettings> settings_;
+
   DISALLOW_COPY_AND_ASSIGN(BlimpCompositorDependencies);
 };