cc: Fix size_t to int truncations in tiles/ and trees/

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/json/json_reader.h"
 #include "base/strings/stringprintf.h"
 #include "base/trace_event/trace_event.h"
 #include "base/trace_event/trace_event_argument.h"
@@ skipping 60 matching lines @@
       is_container_for_fixed_position_layers_(false),
       background_color_(0),
       opacity_(1.0),
       blend_mode_(SkXfermode::kSrcOver_Mode),
       num_descendants_that_draw_content_(0),
       transform_tree_index_(-1),
       opacity_tree_index_(-1),
       clip_tree_index_(-1),
       draw_depth_(0.f),
       needs_push_properties_(false),
-      num_dependents_need_push_properties_(0),
+      num_dependents_need_push_properties_(0u),
       sorting_context_id_(0),
       current_draw_mode_(DRAW_MODE_NONE),
       frame_timing_requests_dirty_(false),
       visited_(false),
       layer_or_descendant_is_drawn_(false),
       sorted_for_recursion_(false) {
   DCHECK_GT(layer_id_, 0);
   DCHECK(layer_tree_impl_);
   layer_tree_impl_->RegisterLayer(this);
   AnimationRegistrar* registrar = layer_tree_impl_->GetAnimationRegistrar();
@@ skipping 1381 matching lines @@
 
 void LayerImpl::SetNeedsPushProperties() {
   if (needs_push_properties_)
     return;
   if (!parent_should_know_need_push_properties() && parent_)
     parent_->AddDependentNeedsPushProperties();
   needs_push_properties_ = true;
 }
 
 void LayerImpl::AddDependentNeedsPushProperties() {
-  DCHECK_GE(num_dependents_need_push_properties_, 0);
-
   if (!parent_should_know_need_push_properties() && parent_)
     parent_->AddDependentNeedsPushProperties();
 
   num_dependents_need_push_properties_++;
 }
 
 void LayerImpl::RemoveDependentNeedsPushProperties() {
+  DCHECK_GT(num_dependents_need_push_properties_, 0u);
   num_dependents_need_push_properties_--;
-  DCHECK_GE(num_dependents_need_push_properties_, 0);
 
   if (!parent_should_know_need_push_properties() && parent_)
       parent_->RemoveDependentNeedsPushProperties();
 }
 
 void LayerImpl::GetAllPrioritizedTilesForTracing(
     std::vector<PrioritizedTile>* prioritized_tiles) const {
 }
 
 void LayerImpl::AsValueInto(base::trace_event::TracedValue* state) const {
@@ skipping 171 matching lines @@
   gfx::Transform scaled_draw_transform =
       draw_properties_.target_space_transform;
   scaled_draw_transform.Scale(SK_MScalar1 / scale, SK_MScalar1 / scale);
   gfx::Size scaled_content_bounds =
       gfx::ToCeiledSize(gfx::ScaleSize(content_bounds(), scale));
   return MathUtil::MapEnclosingClippedRect(scaled_draw_transform,
                                            gfx::Rect(scaled_content_bounds));
 }
 
 }  // namespace cc