Force use of and cache render surface.

cc/layers/layer.cc

 // Copyright 2010 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/layer.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 70 matching lines @@
       inputs_(g_next_layer_id.GetNext() + 1),
       num_descendants_that_draw_content_(0),
       transform_tree_index_(TransformTree::kInvalidNodeId),
       effect_tree_index_(EffectTree::kInvalidNodeId),
       clip_tree_index_(ClipTree::kInvalidNodeId),
       scroll_tree_index_(ScrollTree::kInvalidNodeId),
       property_tree_sequence_number_(-1),
       should_flatten_transform_from_property_tree_(false),
       draws_content_(false),
       should_check_backface_visibility_(false),
+      cache_render_surface_(false),
       force_render_surface_for_testing_(false),
       subtree_property_changed_(false),
       may_contain_video_(false),
       needs_show_scrollbars_(false),
       has_transform_node_(false),
       subtree_has_copy_request_(false),
       safe_opaque_background_color_(0),
       num_unclipped_descendants_(0) {}
 
 Layer::~Layer() {
@@ skipping 795 matching lines @@
 void Layer::SetTouchActionRegion(TouchActionRegion touch_action_region) {
   DCHECK(IsPropertyChangeAllowed());
   if (inputs_.touch_action_region == touch_action_region)
     return;
 
   inputs_.touch_action_region = std::move(touch_action_region);
   SetPropertyTreesNeedRebuild();
   SetNeedsCommit();
 }
 
+void Layer::SetCacheRenderSurface(bool cache) {
+  DCHECK(IsPropertyChangeAllowed());
+  if (cache_render_surface_ == cache)
+    return;
+  cache_render_surface_ = cache;
+  SetPropertyTreesNeedRebuild();
+  SetNeedsCommit();
+}
+
 void Layer::SetForceRenderSurfaceForTesting(bool force) {
   DCHECK(IsPropertyChangeAllowed());
   if (force_render_surface_for_testing_ == force)
     return;
   force_render_surface_for_testing_ = force;
   SetPropertyTreesNeedRebuild();
   SetNeedsCommit();
 }
 
 void Layer::SetDoubleSided(bool double_sided) {
@@ skipping 510 matching lines @@
       ->subtree_has_copy_request;
 }
 
 gfx::Transform Layer::ScreenSpaceTransform() const {
   DCHECK_NE(transform_tree_index_, TransformTree::kInvalidNodeId);
   return draw_property_utils::ScreenSpaceTransform(
       this, layer_tree_host_->property_trees()->transform_tree);
 }
 
 }  // namespace cc