Remove recorded_viewport member variable from picture layer inputs

recorded_viewport is only used as a temporary in PictureLayer::Update.

Change-Id: I60697e3d5e83d9634f09081fddd7fa6093cd328a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1988589
Auto-Submit: Philip Rogers <pdr@chromium.org>
Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Commit-Queue: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#728595}

cc/layers/picture_layer.cc

@@ -128,12 +128,10 @@ bool PictureLayer::Update() {
   // for them.
   DCHECK(picture_layer_inputs_.client);
 
-  picture_layer_inputs_.recorded_viewport =
-      picture_layer_inputs_.client->PaintableRegion();
+  auto recorded_viewport = picture_layer_inputs_.client->PaintableRegion();
 
   updated |= recording_source_->UpdateAndExpandInvalidation(
-      &last_updated_invalidation_, layer_size,
-      picture_layer_inputs_.recorded_viewport);
+      &last_updated_invalidation_, layer_size, recorded_viewport);
 
   if (updated) {
     picture_layer_inputs_.display_list =
@@ -269,7 +267,6 @@ void PictureLayer::DropRecordingSourceContentIfInvalid() {
     // for example), even though it has resized making the recording source no
     // longer valid. In this case just destroy the recording source.
     recording_source_->SetEmptyBounds();
-    picture_layer_inputs_.recorded_viewport = gfx::Rect();
     picture_layer_inputs_.display_list = nullptr;
     picture_layer_inputs_.painter_reported_memory_usage = 0;
   }

cc/layers/picture_layer.h

@@ -71,7 +71,6 @@ class CC_EXPORT PictureLayer : public Layer {
     bool nearest_neighbor = false;
     bool transformed_rasterization_allowed = false;
     bool is_backdrop_filter_mask = false;
-    gfx::Rect recorded_viewport;
     scoped_refptr<DisplayItemList> display_list;
     size_t painter_reported_memory_usage = 0;
   };