cc: Stop converting update rect from int to float to int.

cc/layers/layer_impl.cc

Index: cc/layers/layer_impl.cc
diff --git a/cc/layers/layer_impl.cc b/cc/layers/layer_impl.cc
index 23c7a0df6f75c91dd4b3de6c2bb6311f038ab297..dd7b35935fef376abb18b3c242b82c6a4cbccab1 100644
--- a/cc/layers/layer_impl.cc
+++ b/cc/layers/layer_impl.cc
@@ -599,7 +599,7 @@ void LayerImpl::PushPropertiesTo(LayerImpl* layer) {
 
   // Reset any state that should be cleared for the next update.
   stacking_order_changed_ = false;
-  update_rect_ = gfx::RectF();
+  update_rect_ = gfx::Rect();
   needs_push_properties_ = false;
   num_dependents_need_push_properties_ = 0;
 }
@@ -716,7 +716,7 @@ const char* LayerImpl::LayerTypeAsString() const {
 void LayerImpl::ResetAllChangeTrackingForSubtree() {
   layer_property_changed_ = false;
 
-  update_rect_ = gfx::RectF();
+  update_rect_ = gfx::Rect();
   damage_rect_ = gfx::RectF();
 
   if (draw_properties_.render_surface)
@@ -1032,7 +1032,7 @@ bool LayerImpl::TransformIsAnimatingOnImplOnly() const {
   return transform_animation && transform_animation->is_impl_only();
 }
 
-void LayerImpl::SetUpdateRect(const gfx::RectF& update_rect) {
+void LayerImpl::SetUpdateRect(const gfx::Rect& update_rect) {
   update_rect_ = update_rect;
   SetNeedsPushProperties();
 }