cc: Implement deadline scheduling disabled by default

cc/trees/layer_tree_host_impl.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_impl.h"
 
 #include <algorithm>
 #include <limits>
 
 #include "base/basictypes.h"
@@ skipping 1036 matching lines @@
   }
 }
 
 bool LayerTreeHostImpl::PrepareToDraw(FrameData* frame,
                                       gfx::Rect device_viewport_damage_rect) {
   TRACE_EVENT1("cc",
                "LayerTreeHostImpl::PrepareToDraw",
                "SourceFrameNumber",
                active_tree_->source_frame_number());
 
-  if (need_to_update_visible_tiles_before_draw_) {
-    DCHECK(tile_manager_);
-    if (tile_manager_->UpdateVisibleTiles())
-      DidInitializeVisibleTile();
+  if (need_to_update_visible_tiles_before_draw_ &&
+      tile_manager_ && tile_manager_->UpdateVisibleTiles()) {
+    DidInitializeVisibleTile();
   }
+  need_to_update_visible_tiles_before_draw_ = true;
 
   active_tree_->UpdateDrawProperties();
 
   frame->render_surface_layer_list = &active_tree_->RenderSurfaceLayerList();
   frame->render_passes.clear();
   frame->render_passes_by_id.clear();
   frame->will_draw_layers.clear();
   frame->contains_incomplete_tile = false;
   frame->has_no_damage = false;
 
@@ skipping 17 matching lines @@
 }
 
 void LayerTreeHostImpl::EvictTexturesForTesting() {
   EnforceManagedMemoryPolicy(ManagedMemoryPolicy(0));
 }
 
 void LayerTreeHostImpl::BlockNotifyReadyToActivateForTesting(bool block) {
   NOTREACHED();
 }
 
+void LayerTreeHostImpl::DidInitializeVisibleTileForTesting() {
+  DidInitializeVisibleTile();
+}
+
 void LayerTreeHostImpl::EnforceManagedMemoryPolicy(
     const ManagedMemoryPolicy& policy) {
 
   bool evicted_resources = client_->ReduceContentsTextureMemoryOnImplThread(
       visible_ ? policy.bytes_limit_when_visible
                : policy.bytes_limit_when_not_visible,
       ManagedMemoryPolicy::PriorityCutoffToValue(
           visible_ ? policy.priority_cutoff_when_visible
                    : policy.priority_cutoff_when_not_visible));
   if (evicted_resources) {
@@ skipping 38 matching lines @@
   DCHECK(settings_.impl_side_painting);
   // Mark priorities as dirty and schedule a ManageTiles().
   tile_priorities_dirty_ = true;
   client_->SetNeedsManageTilesOnImplThread();
 }
 
 void LayerTreeHostImpl::DidInitializeVisibleTile() {
   // TODO(reveman): Determine tiles that changed and only damage
   // what's necessary.
   SetFullRootLayerDamage();
-  if (client_)
+  if (client_ && !client_->IsInsideDraw())
     client_->DidInitializeVisibleTileOnImplThread();
 }
 
 void LayerTreeHostImpl::NotifyReadyToActivate() {
   client_->NotifyReadyToActivate();
 }
 
 void LayerTreeHostImpl::SetMemoryPolicy(const ManagedMemoryPolicy& policy) {
   SetManagedMemoryPolicy(policy, zero_budget_);
 }
@@ skipping 327 matching lines @@
     recycle_tree_.swap(pending_tree_);
   else
     pending_tree_ = LayerTreeImpl::create(this);
   client_->OnCanDrawStateChanged(CanDraw());
   TRACE_EVENT_ASYNC_BEGIN0("cc", "PendingTree", pending_tree_.get());
   TRACE_EVENT_ASYNC_STEP0("cc",
                           "PendingTree", pending_tree_.get(), "waiting");
 }
 
 void LayerTreeHostImpl::UpdateVisibleTiles() {
-  DCHECK(!client_->IsInsideDraw()) <<
-      "Updating visible tiles within a draw may trigger "
-      "spurious redraws.";
   if (tile_manager_ && tile_manager_->UpdateVisibleTiles())
     DidInitializeVisibleTile();
-
   need_to_update_visible_tiles_before_draw_ = false;
 }
 
 void LayerTreeHostImpl::ActivatePendingTree() {
   CHECK(pending_tree_);
   TRACE_EVENT_ASYNC_END0("cc", "PendingTree", pending_tree_.get());
 
   need_to_update_visible_tiles_before_draw_ = true;
 
   active_tree_->SetRootLayerScrollOffsetDelegate(NULL);
@@ skipping 1186 matching lines @@
   std::set<UIResourceId>::iterator found_in_evicted =
       evicted_ui_resources_.find(uid);
   if (found_in_evicted == evicted_ui_resources_.end())
     return;
   evicted_ui_resources_.erase(found_in_evicted);
   if (evicted_ui_resources_.empty())
     client_->OnCanDrawStateChanged(CanDraw());
 }
 
 }  // namespace cc