Remove image_decode_tasks_enabled flag.

cc/layers/picture_layer.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.h"
 
 #include "base/auto_reset.h"
 #include "base/trace_event/trace_event.h"
 #include "cc/layers/content_layer_client.h"
 #include "cc/layers/picture_layer_impl.h"
@@ skipping 65 matching lines @@
     return;
 
   if (!host->GetSettings().enable_mask_tiling &&
       mask_type_ == LayerMaskType::MULTI_TEXTURE_MASK)
     mask_type_ = LayerMaskType::SINGLE_TEXTURE_MASK;
 
   if (!recording_source_)
     recording_source_.reset(new RecordingSource);
   recording_source_->SetSlowdownRasterScaleFactor(
       host->GetDebugState().slow_down_raster_scale_factor);
-  // If we need to enable image decode tasks, then we have to generate the
-  // discardable images metadata.
-  const LayerTreeSettings& settings = layer_tree_host()->GetSettings();
-  recording_source_->SetGenerateDiscardableImagesMetadata(
-      settings.image_decode_tasks_enabled);
 }
 
 void PictureLayer::SetNeedsDisplayRect(const gfx::Rect& layer_rect) {
   DCHECK(!layer_tree_host() || !layer_tree_host()->in_paint_layer_contents());
   if (recording_source_)
     recording_source_->SetNeedsDisplayRect(layer_rect);
   Layer::SetNeedsDisplayRect(layer_rect);
 }
 
 bool PictureLayer::Update() {
@@ skipping 180 matching lines @@
     return false;
 
   return true;
 }
 
 const DisplayItemList* PictureLayer::GetDisplayItemList() {
   return picture_layer_inputs_.display_list.get();
 }
 
 }  // namespace cc