cc: Delete the Renderer base class.

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 22cbb9aa5e025987d605c0c9355cad26245d7282..277b542e37b4c5202909cdf9b82b384b299106bf 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -984,7 +984,6 @@ DrawResult LayerTreeHostImpl::CalculateRenderPasses(
   }
 
   RemoveRenderPasses(frame);
-  renderer_->DecideRenderPassAllocationsForFrame(frame->render_passes);
 
   if (have_copy_request) {
     // Any copy requests left in the tree are not going to get serviced, and
@@ -1412,9 +1411,7 @@ void LayerTreeHostImpl::SetManagedMemoryPolicy(
     return;
 
   if (!task_runner_provider_->HasImplThread()) {
-    // In single-thread mode, this can be called on the main thread by
-    // GLRenderer::OnMemoryAllocationChanged.
-    DebugScopedSetImplThread impl_thread(task_runner_provider_);
+    // REMOVE ME ? DebugScopedSetImplThread impl_thread(task_runner_provider_);
     UpdateTileManagerMemoryPolicy(actual_policy);
   } else {
     DCHECK(task_runner_provider_->IsImplThread());
@@ -1463,7 +1460,7 @@ void LayerTreeHostImpl::SetExternalTilePriorityConstraints(
 
     // Compositor, not OutputSurface, is responsible for setting damage and
     // triggering redraw for constraint changes.
-    SetFullRootLayerDamage();
+    SetFullViewportDamage();
     SetNeedsRedraw();
   }
 }
@@ -1535,7 +1532,7 @@ void LayerTreeHostImpl::OnDraw(const gfx::Transform& transform,
     // always swap. Otherwise, need to set redraw for any changes to draw
     // parameters.
     if (transform_changed || viewport_changed || resourceless_software_draw_) {
-      SetFullRootLayerDamage();
+      SetFullViewportDamage();
       SetNeedsRedraw();
       active_tree_->set_needs_update_draw_properties();
     }
@@ -1553,7 +1550,7 @@ void LayerTreeHostImpl::OnDraw(const gfx::Transform& transform,
     // This draw may have reset all damage, which would lead to subsequent
     // incorrect hardware draw, so explicitly set damage for next hardware
     // draw as well.
-    SetFullRootLayerDamage();
+    SetFullViewportDamage();
   }
 }
 
@@ -2112,13 +2109,12 @@ void LayerTreeHostImpl::CreateAndSetRenderer() {
   DCHECK(resource_provider_);
 
   DCHECK(output_surface_->capabilities().delegated_rendering);
-  renderer_ =
-      DelegatingRenderer::Create(this, &settings_.renderer_settings,
-                                 output_surface_, resource_provider_.get());
+  renderer_ = base::MakeUnique<DelegatingRenderer>(output_surface_,
+                                                   resource_provider_.get());
   renderer_->SetVisible(visible_);
-  SetFullRootLayerDamage();
+  SetFullViewportDamage();
 
-  // See note in LayerTreeImpl::UpdateDrawProperties.  Renderer needs to be
+  // See note in LayerTreeImpl::UpdateDrawProperties. Renderer needs to be
   // initialized to get max texture size.  Also, after releasing resources,
   // trees need another update to generate new ones.
   active_tree_->set_needs_update_draw_properties();
@@ -2364,7 +2360,7 @@ void LayerTreeHostImpl::SetViewportSize(const gfx::Size& device_viewport_size) {
 
   UpdateViewportContainerSizes();
   client_->OnCanDrawStateChanged(CanDraw());
-  SetFullRootLayerDamage();
+  SetFullViewportDamage();
   active_tree_->set_needs_update_draw_properties();
 }
 
@@ -2395,7 +2391,7 @@ void LayerTreeHostImpl::DidChangeTopControlsPosition() {
   SetNeedsRedraw();
   SetNeedsOneBeginImplFrame();
   active_tree_->set_needs_update_draw_properties();
-  SetFullRootLayerDamage();
+  SetFullViewportDamage();
 }
 
 float LayerTreeHostImpl::TopControlsHeight() const {
@@ -3174,7 +3170,7 @@ void LayerTreeHostImpl::SetSynchronousInputHandlerRootScrollOffset(
   // After applying the synchronous input handler's scroll offset, tell it what
   // we ended up with.
   UpdateRootLayerStateForSynchronousInputHandler();
-  SetFullRootLayerDamage();
+  SetFullViewportDamage();
   SetNeedsRedraw();
 }
 
@@ -3360,7 +3356,7 @@ std::unique_ptr<ScrollAndScaleSet> LayerTreeHostImpl::ProcessScrollDeltas() {
   return scroll_info;
 }
 
-void LayerTreeHostImpl::SetFullRootLayerDamage() {
+void LayerTreeHostImpl::SetFullViewportDamage() {
   SetViewportDamage(gfx::Rect(DrawViewportSize()));
 }
 
@@ -3649,7 +3645,7 @@ void LayerTreeHostImpl::SetDebugState(
 
   debug_state_ = new_debug_state;
   UpdateTileManagerMemoryPolicy(ActualManagedMemoryPolicy());
-  SetFullRootLayerDamage();
+  SetFullViewportDamage();
 }
 
 void LayerTreeHostImpl::CreateUIResource(UIResourceId uid,