cc: Explicitly invalidate all dropped recordings on the main thread.

cc/layers/picture_layer.cc

Index: cc/layers/picture_layer.cc
diff --git a/cc/layers/picture_layer.cc b/cc/layers/picture_layer.cc
index 5d5457456f06642c8d173658ef15e58c9a05b841..271f7226fceba2fee472b66dd852927165abec81 100644
--- a/cc/layers/picture_layer.cc
+++ b/cc/layers/picture_layer.cc
@@ -44,7 +44,7 @@ void PictureLayer::PushPropertiesTo(LayerImpl* base_layer) {
     // Update may not get called for an empty layer, so resize here instead.
     // Using layer_impl because either bounds() or paint_properties().bounds
     // may disagree and either one could have been pushed to layer_impl.
-    pile_->SetTilingRect(gfx::Rect());
+    pile_->SetEmptyBounds();
   } else if (update_source_frame_number_ ==
              layer_tree_host()->source_frame_number()) {
     // TODO(ernstm): This DCHECK is only valid as long as the pile's tiling_rect
@@ -109,8 +109,6 @@ bool PictureLayer::Update(ResourceUpdateQueue* queue,
   devtools_instrumentation::ScopedLayerTreeTask update_layer(
       devtools_instrumentation::kUpdateLayer, id(), layer_tree_host()->id());
 
-  pile_->SetTilingRect(layer_rect);
-
   // Calling paint in WebKit can sometimes cause invalidations, so save
   // off the invalidation prior to calling update.
   pending_invalidation_.Swap(&pile_invalidation_);
@@ -133,6 +131,7 @@ bool PictureLayer::Update(ResourceUpdateQueue* queue,
                                          SafeOpaqueBackgroundColor(),
                                          contents_opaque(),
                                          client_->FillsBoundsCompletely(),
+                                         layer_rect,
                                          visible_layer_rect,
                                          update_source_frame_number_,
                                          RecordingMode(),