Remove swap content bounds from SkiaRenderer

These data members were carried over from GLRenderer but are never
actually used. This is a no-op change.

Bug: 1161653
Change-Id: I2167b728b754a36200a21a7d18b461cec35e1cdb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2643437Reviewed-by: Peng Huang <penghuang@chromium.org>
Commit-Queue: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845793}

components/viz/service/display/skia_renderer.cc

@@ -752,9 +752,6 @@ void SkiaRenderer::FinishDrawingFrame() {
 
   swap_buffer_rect_ = current_frame()->root_damage_rect;
 
-  if (use_swap_with_bounds_)
-    swap_content_bounds_ = current_frame()->root_content_bounds;
-
   // TODO(weiliangc): Remove this once OverlayProcessor schedules overlays.
   if (current_frame()->output_surface_plane) {
     skia_output_surface_->ScheduleOutputSurfaceAsOverlay(
@@ -771,13 +768,11 @@ void SkiaRenderer::SwapBuffers(SwapFrameData swap_frame_data) {
   output_frame.top_controls_visible_height_changed =
       swap_frame_data.top_controls_visible_height_changed;
   output_frame.size = surface_size_for_swap_buffers();
-  if (use_swap_with_bounds_) {
-    output_frame.content_bounds = std::move(swap_content_bounds_);
-  } else if (use_partial_swap_) {
+  if (use_partial_swap_) {
     swap_buffer_rect_.Intersect(gfx::Rect(surface_size_for_swap_buffers()));
     output_frame.sub_buffer_rect = swap_buffer_rect_;
   } else if (swap_buffer_rect_.IsEmpty() && allow_empty_swap_) {
-    output_frame.sub_buffer_rect = swap_buffer_rect_;
+    output_frame.sub_buffer_rect = gfx::Rect();
   }
 
   skia_output_surface_->SwapBuffers(std::move(output_frame));

components/viz/service/display/skia_renderer.h

@@ -272,10 +272,7 @@ class VIZ_SERVICE_EXPORT SkiaRenderer : public DirectRenderer {
   bool is_scissor_enabled_ = false;
   gfx::Rect scissor_rect_;
 
-  // TODO(crbug.com/920344): Use partial swap for SkDDL.
-  bool use_swap_with_bounds_ = false;
   gfx::Rect swap_buffer_rect_;
-  std::vector<gfx::Rect> swap_content_bounds_;
 
   // State common to all quads in a batch. Draws that require an SkPaint not
   // captured by this state cannot be batched.