Clear Image Decode Cache on Navigation

cc/trees/layer_tree_host.cc

 // Copyright 2011 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/trees/layer_tree_host.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 299 matching lines @@
 
   host_impl->SetHasGpuRasterizationTrigger(has_gpu_rasterization_trigger_);
   host_impl->SetContentIsSuitableForGpuRasterization(
       content_is_suitable_for_gpu_rasterization_);
   RecordGpuRasterizationHistogram(host_impl);
 
   host_impl->SetViewportSize(device_viewport_size_);
   sync_tree->SetDeviceScaleFactor(device_scale_factor_);
   host_impl->SetDebugState(debug_state_);
 
+  if (did_navigate_) {
+    did_navigate_ = false;
+    host_impl->ClearImageCacheOnNavigation();
+  }
+
   sync_tree->set_ui_resource_request_queue(
       ui_resource_manager_->TakeUIResourcesRequests());
 
   {
     TRACE_EVENT0("cc", "LayerTreeHostInProcess::PushProperties");
 
     TreeSynchronizer::PushLayerProperties(this, sync_tree);
 
     // This must happen after synchronizing property trees and after pushing
     // properties, which updates the clobber_active_value flag.
@@ skipping 538 matching lines @@
   }
 
   if (hud_layer_.get())
     hud_layer_->RemoveFromParent();
 
   // Reset gpu rasterization tracking.
   // This flag is sticky until a new tree comes along.
   ResetGpuRasterizationTracking();
 
   SetNeedsFullTreeSync();
+  did_navigate_ = true;
 }
 
 void LayerTreeHost::RegisterViewportLayers(
     scoped_refptr<Layer> overscroll_elasticity_layer,
     scoped_refptr<Layer> page_scale_layer,
     scoped_refptr<Layer> inner_viewport_scroll_layer,
     scoped_refptr<Layer> outer_viewport_scroll_layer) {
   DCHECK(!inner_viewport_scroll_layer ||
          inner_viewport_scroll_layer != outer_viewport_scroll_layer);
   overscroll_elasticity_layer_ = overscroll_elasticity_layer;
@@ skipping 550 matching lines @@
 LayerListReverseIterator<Layer> LayerTreeHost::rend() {
   return LayerListReverseIterator<Layer>(nullptr);
 }
 
 void LayerTreeHost::SetNeedsDisplayOnAllLayers() {
   for (auto* layer : *this)
     layer->SetNeedsDisplay();
 }
 
 }  // namespace cc