cc: Delete the Renderer base class.

cc/output/software_renderer.cc

Index: cc/output/software_renderer.cc
diff --git a/cc/output/software_renderer.cc b/cc/output/software_renderer.cc
index ddc5e4c1a1a09fa5560ae438361c888737016c51..0662b8a4f618b7a1d9b11f1261492ddc831ab892 100644
--- a/cc/output/software_renderer.cc
+++ b/cc/output/software_renderer.cc
@@ -52,7 +52,7 @@ bool IsScaleAndIntegerTranslate(const SkMatrix& matrix) {
 }  // anonymous namespace
 
 std::unique_ptr<SoftwareRenderer> SoftwareRenderer::Create(
-    RendererClient* client,
+    DirectRendererClient* client,
     const RendererSettings* settings,
     OutputSurface* output_surface,
     ResourceProvider* resource_provider) {
@@ -60,13 +60,12 @@ std::unique_ptr<SoftwareRenderer> SoftwareRenderer::Create(
                                                resource_provider));
 }
 
-SoftwareRenderer::SoftwareRenderer(RendererClient* client,
+SoftwareRenderer::SoftwareRenderer(DirectRendererClient* client,
                                    const RendererSettings* settings,
                                    OutputSurface* output_surface,
                                    ResourceProvider* resource_provider)
     : DirectRenderer(client, settings, output_surface, resource_provider),
       is_scissor_enabled_(false),
-      is_backbuffer_discarded_(false),
       output_device_(output_surface->software_device()),
       current_canvas_(nullptr) {
   if (resource_provider_) {
@@ -132,8 +131,6 @@ void SoftwareRenderer::EnsureScissorTestDisabled() {
   SetClipRect(gfx::Rect(size.width(), size.height()));
 }
 
-void SoftwareRenderer::Finish() {}
-
 void SoftwareRenderer::BindFramebufferToOutputSurface(DrawingFrame* frame) {
   DCHECK(!output_surface_->HasExternalStencilTest());
   current_framebuffer_lock_ = nullptr;
@@ -608,33 +605,6 @@ void SoftwareRenderer::CopyCurrentRenderPassToBitmap(
   request->SendBitmapResult(std::move(bitmap));
 }
 
-void SoftwareRenderer::DiscardBackbuffer() {
-  if (is_backbuffer_discarded_)
-    return;
-
-  output_surface_->DiscardBackbuffer();
-
-  is_backbuffer_discarded_ = true;
-
-  // Damage tracker needs a full reset every time framebuffer is discarded.
-  client_->SetFullRootLayerDamage();
-}
-
-void SoftwareRenderer::EnsureBackbuffer() {
-  if (!is_backbuffer_discarded_)
-    return;
-
-  output_surface_->EnsureBackbuffer();
-  is_backbuffer_discarded_ = false;
-}
-
-void SoftwareRenderer::DidChangeVisibility() {
-  if (visible())
-    EnsureBackbuffer();
-  else
-    DiscardBackbuffer();
-}
-
 bool SoftwareRenderer::ShouldApplyBackgroundFilters(
     const RenderPassDrawQuad* quad) const {
   if (quad->background_filters.IsEmpty())