cc: Add support for partial swaps when using impl-side painting.

cc/layers/layer_impl.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/layer_impl.h"
 
 #include "base/debug/trace_event.h"
 #include "base/json/json_reader.h"
 #include "base/strings/stringprintf.h"
 #include "cc/animation/animation_registrar.h"
@@ skipping 683 matching lines @@
 }
 
 const char* LayerImpl::LayerTypeAsString() const {
   return "cc::LayerImpl";
 }
 
 void LayerImpl::ResetAllChangeTrackingForSubtree() {
   layer_property_changed_ = false;
 
   update_rect_ = gfx::RectF();
+  damage_rect_ = gfx::RectF();
 
   if (draw_properties_.render_surface)
     draw_properties_.render_surface->ResetPropertyChangedFlag();
 
   if (mask_layer_)
     mask_layer_->ResetAllChangeTrackingForSubtree();
 
   if (replica_layer_) {
     // This also resets the replica mask, if it exists.
     replica_layer_->ResetAllChangeTrackingForSubtree();
@@ skipping 296 matching lines @@
   Animation* transform_animation =
       layer_animation_controller_->GetAnimation(Animation::Transform);
   return transform_animation && transform_animation->is_impl_only();
 }
 
 void LayerImpl::SetUpdateRect(const gfx::RectF& update_rect) {
   update_rect_ = update_rect;
   SetNeedsPushProperties();
 }
 
+void LayerImpl::AddLayerDamageRect(const gfx::RectF& damage_rect) {

[reveman, 2014/04/17 05:18:34]

should this be AddDamageRect or should SetUpdateRect be renamed to
SetLayerUpdateRect? They both take a rect in layer space.

[danakj, 2014/04/17 14:14:34]

SetUpdateRect should be renamed, so should update_rect_ really. But I think
that's outside the scope of this CL?

[reveman, 2014/04/18 14:30:56]

Ok, I would then name this AddDamageRect right now for consistency and rename
everything in a follow up.

+  damage_rect_ = gfx::UnionRects(damage_rect_, damage_rect);
+}
+
 void LayerImpl::SetContentBounds(const gfx::Size& content_bounds) {
   if (this->content_bounds() == content_bounds)
     return;
 
   draw_properties_.content_bounds = content_bounds;
   NoteLayerPropertyChanged();
 }
 
 void LayerImpl::SetContentsScale(float contents_scale_x,
                                  float contents_scale_y) {
@@ skipping 470 matching lines @@
 scoped_ptr<base::Value> LayerImpl::AsValue() const {
   scoped_ptr<base::DictionaryValue> state(new base::DictionaryValue());
   AsValueInto(state.get());
   return state.PassAs<base::Value>();
 }
 
 void LayerImpl::RunMicroBenchmark(MicroBenchmarkImpl* benchmark) {
   benchmark->RunOnLayer(this);
 }
 }  // namespace cc