cc: Delete the Renderer base class.

cc/trees/layer_tree_host_impl.h

Index: cc/trees/layer_tree_host_impl.h
diff --git a/cc/trees/layer_tree_host_impl.h b/cc/trees/layer_tree_host_impl.h
index 6ccd0fc0de427713ec35a5927ff3da194ba59013..6949a4f53a73a63112ccce023706805e90c03e5c 100644
--- a/cc/trees/layer_tree_host_impl.h
+++ b/cc/trees/layer_tree_host_impl.h
@@ -27,6 +27,7 @@
 #include "cc/layers/layer_collections.h"
 #include "cc/layers/render_pass_sink.h"
 #include "cc/output/begin_frame_args.h"
+#include "cc/output/delegating_renderer.h"
 #include "cc/output/managed_memory_policy.h"
 #include "cc/output/output_surface_client.h"
 #include "cc/output/renderer.h"
@@ -139,7 +140,6 @@ class LayerTreeHostImplClient {
 // state.
 class CC_EXPORT LayerTreeHostImpl
     : public InputHandler,
-      public RendererClient,
       public TileManagerClient,
       public OutputSurfaceClient,
       public TopControlsManagerClient,
@@ -247,6 +247,7 @@ class CC_EXPORT LayerTreeHostImpl
   void MainThreadHasStoppedFlinging();
   void DidAnimateScrollOffset();
   void SetViewportDamage(const gfx::Rect& damage_rect);
+  void SetFullViewportDamage();
 
   void SetTreeLayerFilterMutated(ElementId element_id,
                                  LayerTreeImpl* tree,
@@ -336,9 +337,6 @@ class CC_EXPORT LayerTreeHostImpl
   // Viewport rect in view space used for tiling prioritization.
   const gfx::Rect ViewportRectForTilePriority() const;
 
-  // RendererClient implementation.
-  void SetFullRootLayerDamage() override;
-
   // TileManagerClient implementation.
   void NotifyReadyToActivate() override;
   void NotifyReadyToDraw() override;
@@ -422,7 +420,7 @@ class CC_EXPORT LayerTreeHostImpl
     return settings_.create_low_res_tiling && !use_gpu_rasterization_;
   }
   ResourcePool* resource_pool() { return resource_pool_.get(); }
-  Renderer* renderer() { return renderer_.get(); }
+  DelegatingRenderer* renderer() { return renderer_.get(); }
   ImageDecodeController* image_decode_controller() {
     return image_decode_controller_.get();
   }
@@ -566,8 +564,8 @@ class CC_EXPORT LayerTreeHostImpl
 
   CompositorFrameMetadata MakeCompositorFrameMetadata() const;
   // Viewport rectangle and clip in nonflipped window space.  These rects
-  // should only be used by Renderer subclasses to populate glViewport/glClip
-  // and their software-mode equivalents.
+  // should only be used in the CompositorFrame to describe the physical
+  // viewport for drawing.
   gfx::Rect DeviceViewport() const;
 
   // When a SwapPromiseMonitor is created on the impl thread, it calls
@@ -742,7 +740,7 @@ class CC_EXPORT LayerTreeHostImpl
   std::unique_ptr<RasterBufferProvider> raster_buffer_provider_;
   std::unique_ptr<TileTaskManager> tile_task_manager_;
   std::unique_ptr<ResourcePool> resource_pool_;
-  std::unique_ptr<Renderer> renderer_;
+  std::unique_ptr<DelegatingRenderer> renderer_;
   std::unique_ptr<ImageDecodeController> image_decode_controller_;
 
   GlobalStateThatImpactsTilePriority global_tile_state_;