Update from https://crrev.com/308331

cc/layers/picture_layer_impl.cc

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/layers/picture_layer_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <set>
 
@@ skipping 45 matching lines @@
 }
 
 PictureLayerImpl::Pair::Pair(PictureLayerImpl* active_layer,
                              PictureLayerImpl* pending_layer)
     : active(active_layer), pending(pending_layer) {
 }
 
 PictureLayerImpl::Pair::~Pair() {
 }
 
-PictureLayerImpl::PictureLayerImpl(LayerTreeImpl* tree_impl, int id)
+PictureLayerImpl::PictureLayerImpl(LayerTreeImpl* tree_impl,
+                                   int id,
+                                   bool is_mask)
     : LayerImpl(tree_impl, id),
       twin_layer_(nullptr),
+      tilings_(CreatePictureLayerTilingSet()),
+      // TODO(danakj): Can this be null to start?
       raster_source_(PicturePileImpl::Create()),
       ideal_page_scale_(0.f),
       ideal_device_scale_(0.f),
       ideal_source_scale_(0.f),
       ideal_contents_scale_(0.f),
       raster_page_scale_(0.f),
       raster_device_scale_(0.f),
       raster_source_scale_(0.f),
       raster_contents_scale_(0.f),
       low_res_raster_contents_scale_(0.f),
       raster_source_scale_is_fixed_(false),
       was_screen_space_transform_animating_(false),
       needs_post_commit_initialization_(true),
       should_update_tile_priorities_(false),
       only_used_low_res_last_append_quads_(false),
-      is_mask_(false) {
+      is_mask_(is_mask),
+      nearest_neighbor_(false) {
   layer_tree_impl()->RegisterPictureLayerImpl(this);
 }
 
 PictureLayerImpl::~PictureLayerImpl() {
   if (twin_layer_)
     twin_layer_->twin_layer_ = nullptr;
   layer_tree_impl()->UnregisterPictureLayerImpl(this);
 }
 
 scoped_ptr<TilingSetEvictionQueue> PictureLayerImpl::CreateEvictionQueue(
     TreePriority tree_priority) {
   if (!tilings_)
     return make_scoped_ptr(new TilingSetEvictionQueue());
-  return make_scoped_ptr(
-      new TilingSetEvictionQueue(tilings_.get(), tree_priority));
+  bool skip_shared_out_of_order_tiles =
+      GetPendingOrActiveTwinLayer() != nullptr;
+  return make_scoped_ptr(new TilingSetEvictionQueue(
+      tilings_.get(), tree_priority, skip_shared_out_of_order_tiles));
 }
 
 scoped_ptr<TilingSetRasterQueue> PictureLayerImpl::CreateRasterQueue(
     bool prioritize_low_res) {
   if (!tilings_)
     return make_scoped_ptr(new TilingSetRasterQueue());
   return make_scoped_ptr(
       new TilingSetRasterQueue(tilings_.get(), prioritize_low_res));
 }
 
 const char* PictureLayerImpl::LayerTypeAsString() const {
   return "cc::PictureLayerImpl";
 }
 
 scoped_ptr<LayerImpl> PictureLayerImpl::CreateLayerImpl(
     LayerTreeImpl* tree_impl) {
-  return PictureLayerImpl::Create(tree_impl, id());
+  return PictureLayerImpl::Create(tree_impl, id(), is_mask_);
 }
 
 void PictureLayerImpl::PushPropertiesTo(LayerImpl* base_layer) {
   // It's possible this layer was never drawn or updated (e.g. because it was
   // a descendant of an opacity 0 layer).
   DoPostCommitInitializationIfNeeded();
   PictureLayerImpl* layer_impl = static_cast<PictureLayerImpl*>(base_layer);
+  DCHECK_EQ(layer_impl->is_mask_, is_mask_);
 
   LayerImpl::PushPropertiesTo(base_layer);
 
   // Twin relationships should never change once established.
   DCHECK_IMPLIES(twin_layer_, twin_layer_ == layer_impl);
   DCHECK_IMPLIES(twin_layer_, layer_impl->twin_layer_ == this);
   // The twin relationship does not need to exist before the first
   // PushPropertiesTo from pending to active layer since before that the active
   // layer can not have a pile or tilings, it has only been created and inserted
   // into the tree at that point.
   twin_layer_ = layer_impl;
   layer_impl->twin_layer_ = this;
 
-  layer_impl->set_is_mask(is_mask_);
-  layer_impl->UpdateRasterSource(raster_source_);
+  layer_impl->SetNearestNeighbor(nearest_neighbor_);
 
+  // Solid color layers have no tilings.
   DCHECK_IMPLIES(raster_source_->IsSolidColor(), tilings_->num_tilings() == 0);
-  // Tilings would be expensive to push, so we swap.
-  layer_impl->tilings_.swap(tilings_);
-  layer_impl->tilings_->SetClient(layer_impl);
-  if (tilings_)
-    tilings_->SetClient(this);
+  // The pending tree should only have a high res (and possibly low res) tiling.
+  DCHECK_LE(tilings_->num_tilings(),
+            layer_tree_impl()->create_low_res_tiling() ? 2u : 1u);
 
-  // Ensure that the recycle tree doesn't have any unshared tiles.
-  if (tilings_ && raster_source_->IsSolidColor())
-    tilings_->RemoveAllTilings();
+  layer_impl->UpdateRasterSource(raster_source_, &invalidation_,
+                                 tilings_.get());
+  DCHECK(invalidation_.IsEmpty());
 
-  // Remove invalidated tiles from what will become a recycle tree.
-  if (tilings_)
-    tilings_->RemoveTilesInRegion(invalidation_);
+  // After syncing a solid color layer, the active layer has no tilings.
+  DCHECK_IMPLIES(raster_source_->IsSolidColor(),
+                 layer_impl->tilings_->num_tilings() == 0);
 
   layer_impl->raster_page_scale_ = raster_page_scale_;
   layer_impl->raster_device_scale_ = raster_device_scale_;
   layer_impl->raster_source_scale_ = raster_source_scale_;
   layer_impl->raster_contents_scale_ = raster_contents_scale_;
   layer_impl->low_res_raster_contents_scale_ = low_res_raster_contents_scale_;
+
+  layer_impl->SanityCheckTilingState();
+
   layer_impl->needs_post_commit_initialization_ = false;
-
-  // The invalidation on this soon-to-be-recycled layer must be cleared to
-  // mirror clearing the invalidation in PictureLayer's version of this function
-  // in case push properties is skipped.
-  layer_impl->invalidation_.Swap(&invalidation_);
-  invalidation_.Clear();
   needs_post_commit_initialization_ = true;
 
   // We always need to push properties.
   // See http://crbug.com/303943
+  // TODO(danakj): Stop always pushing properties since we don't swap tilings.
   needs_push_properties_ = true;
 }
 
-void PictureLayerImpl::UpdateRasterSource(
-    scoped_refptr<RasterSource> raster_source) {
-  bool could_have_tilings = CanHaveTilings();
-  raster_source_.swap(raster_source);
-
-  // Need to call UpdateTiles again if CanHaveTilings changed.
-  if (could_have_tilings != CanHaveTilings()) {
-    layer_tree_impl()->set_needs_update_draw_properties();
-  }
-}
-
 void PictureLayerImpl::AppendQuads(RenderPass* render_pass,
                                    const Occlusion& occlusion_in_content_space,
                                    AppendQuadsData* append_quads_data) {
   DCHECK(!needs_post_commit_initialization_);
   // The bounds and the pile size may differ if the pile wasn't updated (ie.
   // PictureLayer::Update didn't happen). In that case the pile will be empty.
   DCHECK_IMPLIES(!raster_source_->GetSize().IsEmpty(),
                  bounds() == raster_source_->GetSize())
       << " bounds " << bounds().ToString() << " pile "
       << raster_source_->GetSize().ToString();
@@ skipping 49 matching lines @@
     if (visible_geometry_rect.IsEmpty())
       return;
 
     gfx::Size texture_size = scaled_visible_content_rect.size();
     gfx::RectF texture_rect = gfx::RectF(texture_size);
     gfx::Rect quad_content_rect = scaled_visible_content_rect;
 
     PictureDrawQuad* quad =
         render_pass->CreateAndAppendDrawQuad<PictureDrawQuad>();
     quad->SetNew(shared_quad_state, geometry_rect, opaque_rect,
-                 visible_geometry_rect, texture_rect, texture_size, RGBA_8888,
-                 quad_content_rect, max_contents_scale, raster_source_);
+                 visible_geometry_rect, texture_rect, texture_size,
+                 nearest_neighbor_, RGBA_8888, quad_content_rect,
+                 max_contents_scale, raster_source_);
     return;
   }
 
   AppendDebugBorderQuad(
       render_pass, scaled_content_bounds, shared_quad_state, append_quads_data);
 
   if (ShowDebugBorders()) {
     for (PictureLayerTilingSet::CoverageIterator iter(
              tilings_.get(),
              max_contents_scale,
@@ skipping 91 matching lines @@
 
           TileDrawQuad* quad =
               render_pass->CreateAndAppendDrawQuad<TileDrawQuad>();
           quad->SetNew(shared_quad_state,
                        geometry_rect,
                        opaque_rect,
                        visible_geometry_rect,
                        draw_info.get_resource_id(),
                        texture_rect,
                        iter.texture_size(),
-                       draw_info.contents_swizzled());
+                       draw_info.contents_swizzled(),
+                       nearest_neighbor_);
           has_draw_quad = true;
           break;
         }
         case ManagedTileState::DrawInfo::PICTURE_PILE_MODE: {
           if (!layer_tree_impl()
                    ->GetRendererCapabilities()
                    .allow_rasterize_on_demand) {
             ++on_demand_missing_tile_count;
             break;
           }
 
           gfx::RectF texture_rect = iter.texture_rect();
 
           ResourceProvider* resource_provider =
               layer_tree_impl()->resource_provider();
           ResourceFormat format =
               resource_provider->memory_efficient_texture_format();
           PictureDrawQuad* quad =
               render_pass->CreateAndAppendDrawQuad<PictureDrawQuad>();
           quad->SetNew(shared_quad_state, geometry_rect, opaque_rect,
                        visible_geometry_rect, texture_rect, iter.texture_size(),
-                       format, iter->content_rect(), iter->contents_scale(),
-                       raster_source_);
+                       nearest_neighbor_, format, iter->content_rect(),
+                       iter->contents_scale(), raster_source_);
           has_draw_quad = true;
           break;
         }
         case ManagedTileState::DrawInfo::SOLID_COLOR_MODE: {
           SolidColorDrawQuad* quad =
               render_pass->CreateAndAppendDrawQuad<SolidColorDrawQuad>();
           quad->SetNew(shared_quad_state,
                        geometry_rect,
                        visible_geometry_rect,
                        draw_info.get_solid_color(),
@@ skipping 77 matching lines @@
     ideal_page_scale_ = 0.f;
     ideal_device_scale_ = 0.f;
     ideal_contents_scale_ = 0.f;
     ideal_source_scale_ = 0.f;
     SanityCheckTilingState();
     return;
   }
 
   UpdateIdealScales();
 
-  DCHECK_IMPLIES(tilings_->num_tilings() == 0, raster_contents_scale_ == 0.f)
-      << "A layer with no tilings shouldn't have valid raster scales";
   if (!raster_contents_scale_ || ShouldAdjustRasterScale()) {
     RecalculateRasterScales();
     AddTilingsForRasterScale();
   }
 
   DCHECK(raster_page_scale_);
   DCHECK(raster_device_scale_);
   DCHECK(raster_source_scale_);
   DCHECK(raster_contents_scale_);
   DCHECK(low_res_raster_contents_scale_);
@@ skipping 74 matching lines @@
     return nullptr;
   return twin_layer_;
 }
 
 PictureLayerImpl* PictureLayerImpl::GetRecycledTwinLayer() const {
   if (!twin_layer_ || twin_layer_->IsOnActiveOrPendingTree())
     return nullptr;
   return twin_layer_;
 }
 
+void PictureLayerImpl::UpdateRasterSource(
+    scoped_refptr<RasterSource> raster_source,
+    Region* new_invalidation,
+    const PictureLayerTilingSet* pending_set) {
+  // The bounds and the pile size may differ if the pile wasn't updated (ie.
+  // PictureLayer::Update didn't happen). In that case the pile will be empty.
+  DCHECK_IMPLIES(!raster_source->GetSize().IsEmpty(),
+                 bounds() == raster_source->GetSize())
+      << " bounds " << bounds().ToString() << " pile "
+      << raster_source->GetSize().ToString();
+
+  bool could_have_tilings = CanHaveTilings();
+  raster_source_.swap(raster_source);
+
+  // The |new_invalidation| must be cleared before updating tilings since they
+  // access the invalidation through the PictureLayerTilingClient interface.
+  invalidation_.Clear();
+  invalidation_.Swap(new_invalidation);
+
+  bool can_have_tilings = CanHaveTilings();
+
+  // Need to call UpdateTiles again if CanHaveTilings changed.
+  if (could_have_tilings != can_have_tilings)
+    layer_tree_impl()->set_needs_update_draw_properties();
+
+  if (!can_have_tilings) {
+    RemoveAllTilings();
+    return;
+  }
+
+  // We could do this after doing UpdateTiles, which would avoid doing this for
+  // tilings that are going to disappear on the pending tree (if scale changed).
+  // But that would also be more complicated, so we just do it here for now.
+  tilings_->UpdateTilingsToCurrentRasterSource(
+      raster_source_.get(), pending_set, raster_source_->GetSize(),
+      invalidation_, MinimumContentsScale());
+}
+
 void PictureLayerImpl::NotifyTileStateChanged(const Tile* tile) {
   if (layer_tree_impl()->IsActiveTree()) {
     gfx::RectF layer_damage_rect =
         gfx::ScaleRect(tile->content_rect(), 1.f / tile->contents_scale());
     AddDamageRect(layer_damage_rect);
   }
 }
 
 void PictureLayerImpl::DidBecomeActive() {
   LayerImpl::DidBecomeActive();
   // TODO(vmpstr): See if this can be removed in favour of calling it from LTHI
   layer_tree_impl()->DidModifyTilePriorities();
 }
 
 void PictureLayerImpl::DidBeginTracing() {
   raster_source_->DidBeginTracing();
 }
 
 void PictureLayerImpl::ReleaseResources() {
+  // Recreate tilings with new settings, since some of those might change when
+  // we release resources. If tilings_ is null, then leave it as null.
   if (tilings_)
-    RemoveAllTilings();
-
+    tilings_ = CreatePictureLayerTilingSet();
   ResetRasterScale();
 
   // To avoid an edge case after lost context where the tree is up to date but
   // the tilings have not been managed, request an update draw properties
   // to force tilings to get managed.
   layer_tree_impl()->set_needs_update_draw_properties();
 }
 
 skia::RefPtr<SkPicture> PictureLayerImpl::GetPicture() {
   return raster_source_->GetFlattenedPicture();
@@ skipping 14 matching lines @@
 
   return layer_tree_impl()->tile_manager()->CreateTile(
       raster_source_.get(), content_rect.size(), content_rect,
       tiling->contents_scale(), id(), layer_tree_impl()->source_frame_number(),
       flags);
 }
 
 const Region* PictureLayerImpl::GetPendingInvalidation() {
   if (layer_tree_impl()->IsPendingTree())
     return &invalidation_;
+  if (layer_tree_impl()->IsRecycleTree())
+    return nullptr;
   DCHECK(layer_tree_impl()->IsActiveTree());
   if (PictureLayerImpl* twin_layer = GetPendingOrActiveTwinLayer())
     return &twin_layer->invalidation_;
   return nullptr;
 }
 
 const PictureLayerTiling* PictureLayerImpl::GetPendingOrActiveTwinTiling(
     const PictureLayerTiling* tiling) const {
   PictureLayerImpl* twin_layer = GetPendingOrActiveTwinLayer();
   if (!twin_layer)
     return nullptr;
-  // TODO(danakj): Remove this when no longer swapping tilings.
-  if (!twin_layer->tilings_)
-    return nullptr;
   return twin_layer->tilings_->FindTilingWithScale(tiling->contents_scale());
 }
 
 PictureLayerTiling* PictureLayerImpl::GetRecycledTwinTiling(
     const PictureLayerTiling* tiling) {
   PictureLayerImpl* recycled_twin = GetRecycledTwinLayer();
   if (!recycled_twin || !recycled_twin->tilings_)
     return nullptr;
   return recycled_twin->tilings_->FindTilingWithScale(tiling->contents_scale());
 }
 
 TilePriority::PriorityBin PictureLayerImpl::GetMaxTilePriorityBin() const {
   if (!HasValidTilePriorities())
     return TilePriority::EVENTUALLY;
   return TilePriority::NOW;
 }
 
-size_t PictureLayerImpl::GetMaxTilesForInterestArea() const {
-  return layer_tree_impl()->settings().max_tiles_for_interest_area;
-}
-
-float PictureLayerImpl::GetSkewportTargetTimeInSeconds() const {
-  return layer_tree_impl()->use_gpu_rasterization()
-             ? 0.f
-             : layer_tree_impl()->settings().skewport_target_time_in_seconds;
-}
-
-int PictureLayerImpl::GetSkewportExtrapolationLimitInContentPixels() const {
-  return layer_tree_impl()
-      ->settings()
-      .skewport_extrapolation_limit_in_content_pixels;
-}
-
 bool PictureLayerImpl::RequiresHighResToDraw() const {
   return layer_tree_impl()->RequiresHighResToDraw();
 }
 
 gfx::Size PictureLayerImpl::CalculateTileSize(
     const gfx::Size& content_bounds) const {
   int max_texture_size =
       layer_tree_impl()->resource_provider()->max_texture_size();
 
   if (is_mask_) {
@@ skipping 61 matching lines @@
     tile_height = RoundUp(tile_height, kTileRoundUp);
     tile_height = std::min(tile_height, default_tile_height);
   }
 
   // Under no circumstance should we be larger than the max texture size.
   tile_width = std::min(tile_width, max_texture_size);
   tile_height = std::min(tile_height, max_texture_size);
   return gfx::Size(tile_width, tile_height);
 }
 
-void PictureLayerImpl::SyncFromActiveLayer(const PictureLayerImpl* other) {
-  DCHECK(!other->needs_post_commit_initialization_);
-  DCHECK(other->tilings_);
-
-  if (!DrawsContent()) {
-    RemoveAllTilings();
-    return;
-  }
-
-  raster_page_scale_ = other->raster_page_scale_;
-  raster_device_scale_ = other->raster_device_scale_;
-  raster_source_scale_ = other->raster_source_scale_;
-  raster_contents_scale_ = other->raster_contents_scale_;
-  low_res_raster_contents_scale_ = other->low_res_raster_contents_scale_;
-
-  bool synced_high_res_tiling = false;
-  if (CanHaveTilings()) {
-    synced_high_res_tiling = tilings_->SyncTilings(
-        *other->tilings_, raster_source_->GetSize(), invalidation_,
-        MinimumContentsScale(), raster_source_.get());
-  } else {
-    RemoveAllTilings();
-  }
-
-  // If our MinimumContentsScale has changed to prevent the twin's high res
-  // tiling from being synced, we should reset the raster scale and let it be
-  // recalculated (1) again. This can happen if our bounds shrink to the point
-  // where min contents scale grows.
-  // (1) - TODO(vmpstr) Instead of hoping that this will be recalculated, we
-  // should refactor this code a little bit and actually recalculate this.
-  // However, this is a larger undertaking, so this will work for now.
-  if (!synced_high_res_tiling)
-    ResetRasterScale();
-  else
-    SanityCheckTilingState();
-}
-
-void PictureLayerImpl::SyncTiling(
-    const PictureLayerTiling* tiling) {
-  if (!tilings_)
-    return;
-  if (!CanHaveTilingWithScale(tiling->contents_scale()))
-    return;
-  tilings_->AddTiling(tiling->contents_scale(), raster_source_->GetSize());
-
-  // If this tree needs update draw properties, then the tiling will
-  // get updated prior to drawing or activation.  If this tree does not
-  // need update draw properties, then its transforms are up to date and
-  // we can create tiles for this tiling immediately.
-  if (!layer_tree_impl()->needs_update_draw_properties() &&
-      should_update_tile_priorities_) {
-    // TODO(danakj): Add a DCHECK() that we are not using occlusion tracking
-    // when we stop using the pending tree in the browser compositor. If we want
-    // to support occlusion tracking here, we need to dirty the draw properties
-    // or save occlusion as a draw property.
-    UpdateTilePriorities(Occlusion());
-  }
-}
-
 void PictureLayerImpl::GetContentsResourceId(
     ResourceProvider::ResourceId* resource_id,
     gfx::Size* resource_size) const {
-  DCHECK_EQ(bounds().ToString(), raster_source_->GetSize().ToString());
+  // The bounds and the pile size may differ if the pile wasn't updated (ie.
+  // PictureLayer::Update didn't happen). In that case the pile will be empty.
+  DCHECK_IMPLIES(!raster_source_->GetSize().IsEmpty(),
+                 bounds() == raster_source_->GetSize())
+      << " bounds " << bounds().ToString() << " pile "
+      << raster_source_->GetSize().ToString();
   gfx::Rect content_rect(bounds());
   PictureLayerTilingSet::CoverageIterator iter(
       tilings_.get(), 1.f, content_rect, ideal_contents_scale_);
 
   // Mask resource not ready yet.
   if (!iter || !*iter) {
     *resource_id = 0;
     return;
   }
 
   // Masks only supported if they fit on exactly one tile.
   DCHECK(iter.geometry_rect() == content_rect)
       << "iter rect " << iter.geometry_rect().ToString() << " content rect "
       << content_rect.ToString();
 
   const ManagedTileState::DrawInfo& draw_info = iter->draw_info();
   if (!draw_info.IsReadyToDraw() ||
       draw_info.mode() != ManagedTileState::DrawInfo::RESOURCE_MODE) {
     *resource_id = 0;
     return;
   }
 
   *resource_id = draw_info.get_resource_id();
   *resource_size = iter.texture_size();
 }
 
+void PictureLayerImpl::SetNearestNeighbor(bool nearest_neighbor) {
+  if (nearest_neighbor_ == nearest_neighbor)
+    return;
+
+  nearest_neighbor_ = nearest_neighbor;
+  NoteLayerPropertyChanged();
+}
+
 void PictureLayerImpl::DoPostCommitInitialization() {
+  // TODO(danakj): Remove this.
   DCHECK(needs_post_commit_initialization_);
   DCHECK(layer_tree_impl()->IsPendingTree());
-
-  if (!tilings_)
-    tilings_ = PictureLayerTilingSet::Create(this);
-
-  PictureLayerImpl* twin_layer = GetPendingOrActiveTwinLayer();
-  if (twin_layer) {
-    // If the twin has never been pushed to, do not sync from it.
-    // This can happen if this function is called during activation.
-    if (!twin_layer->needs_post_commit_initialization_)
-      SyncFromActiveLayer(twin_layer);
-  }
-
   needs_post_commit_initialization_ = false;
 }
 
 PictureLayerTiling* PictureLayerImpl::AddTiling(float contents_scale) {
   DCHECK(CanHaveTilingWithScale(contents_scale)) <<
       "contents_scale: " << contents_scale;
 
   PictureLayerTiling* tiling =
       tilings_->AddTiling(contents_scale, raster_source_->GetSize());
 
   DCHECK(raster_source_->HasRecordings());
 
-  if (PictureLayerImpl* twin_layer = GetPendingOrActiveTwinLayer())
-    twin_layer->SyncTiling(tiling);
-
   return tiling;
 }
 
 void PictureLayerImpl::RemoveAllTilings() {
   if (tilings_)
     tilings_->RemoveAllTilings();
   // If there are no tilings, then raster scales are no longer meaningful.
   ResetRasterScale();
 }
 
@@ skipping 25 matching lines @@
   if (can_have_low_res && needs_low_res && !is_pinching && !is_animating)
     low_res = AddTiling(low_res_raster_contents_scale_);
 
   // Set low-res if we have one.
   if (low_res && low_res != high_res)
     low_res->set_resolution(LOW_RESOLUTION);
 
   // Make sure we always have one high-res (even if high == low).
   high_res->set_resolution(HIGH_RESOLUTION);
 
+  if (layer_tree_impl()->IsPendingTree()) {
+    // On the pending tree, drop any tilings that are non-ideal since we don't
+    // need them to activate anyway.
+    tilings_->RemoveNonIdealTilings();
+  }
+
   SanityCheckTilingState();
 }
 
 bool PictureLayerImpl::ShouldAdjustRasterScale() const {
   if (was_screen_space_transform_animating_ !=
       draw_properties().screen_space_transform_is_animating)
     return true;
 
   if (draw_properties().screen_space_transform_is_animating &&
       raster_contents_scale_ != ideal_contents_scale_ &&
@@ skipping 164 matching lines @@
   PictureLayerTilingSet* twin_set = twin ? twin->tilings_.get() : nullptr;
   PictureLayerImpl* recycled_twin = GetRecycledTwinLayer();
   PictureLayerTilingSet* recycled_twin_set =
       recycled_twin ? recycled_twin->tilings_.get() : nullptr;
 
   tilings_->CleanUpTilings(min_acceptable_high_res_scale,
                            max_acceptable_high_res_scale, used_tilings,
                            layer_tree_impl()->create_low_res_tiling(), twin_set,
                            recycled_twin_set);
 
-  if (twin_set && twin_set->num_tilings() == 0)
-    twin->ResetRasterScale();
-
   if (recycled_twin_set && recycled_twin_set->num_tilings() == 0)
     recycled_twin->ResetRasterScale();
 
   DCHECK_GT(tilings_->num_tilings(), 0u);
   SanityCheckTilingState();
 }
 
 float PictureLayerImpl::MinimumContentsScale() const {
   float setting_min = layer_tree_impl()->settings().minimum_contents_scale;
 
@@ skipping 22 matching lines @@
   should_update_tile_priorities_ = false;
 }
 
 bool PictureLayerImpl::CanHaveTilings() const {
   if (raster_source_->IsSolidColor())
     return false;
   if (!DrawsContent())
     return false;
   if (!raster_source_->HasRecordings())
     return false;
+  // If the |raster_source_| has a recording it should have non-empty bounds.
+  DCHECK(!raster_source_->GetSize().IsEmpty());
   return true;
 }
 
 bool PictureLayerImpl::CanHaveTilingWithScale(float contents_scale) const {
   if (!CanHaveTilings())
     return false;
   if (contents_scale < MinimumContentsScale())
     return false;
   return true;
 }
@@ skipping 18 matching lines @@
 
 bool PictureLayerImpl::ShouldAdjustRasterScaleDuringScaleAnimations() const {
   return layer_tree_impl()->use_gpu_rasterization();
 }
 
 float PictureLayerImpl::MaximumTilingContentsScale() const {
   float max_contents_scale = tilings_->GetMaximumContentsScale();
   return std::max(max_contents_scale, MinimumContentsScale());
 }
 
+scoped_ptr<PictureLayerTilingSet>
+PictureLayerImpl::CreatePictureLayerTilingSet() {
+  const LayerTreeSettings& settings = layer_tree_impl()->settings();
+  return PictureLayerTilingSet::Create(
+      this, settings.max_tiles_for_interest_area,
+      layer_tree_impl()->use_gpu_rasterization()
+          ? 0.f
+          : settings.skewport_target_time_in_seconds,
+      settings.skewport_extrapolation_limit_in_content_pixels);
+}
+
 void PictureLayerImpl::UpdateIdealScales() {
   DCHECK(CanHaveTilings());
 
   float min_contents_scale = MinimumContentsScale();
   DCHECK_GT(min_contents_scale, 0.f);
   float min_page_scale = layer_tree_impl()->min_page_scale_factor();
   DCHECK_GT(min_page_scale, 0.f);
   float min_device_scale = 1.f;
   float min_source_scale =
       min_contents_scale / min_page_scale / min_device_scale;
@@ skipping 146 matching lines @@
 
 bool PictureLayerImpl::AllTilesRequiredForDrawAreReadyToDraw() const {
   if (!layer_tree_impl()->IsActiveTree())
     return true;
 
   return AllTilesRequiredAreReadyToDraw(
       &PictureLayerTiling::IsTileRequiredForDrawIfVisible);
 }
 
 }  // namespace cc