Revert of Remove DCHECK_IMPLIES/CHECK_IMPLIES.

cc/scheduler/scheduler_state_machine.cc

Index: cc/scheduler/scheduler_state_machine.cc
diff --git a/cc/scheduler/scheduler_state_machine.cc b/cc/scheduler/scheduler_state_machine.cc
index 2e4ad85d53b2903885ec46029146cb17c0b403cf..8e4fed85c73b2667f92ce354a14ee77b7b8a72f2 100644
--- a/cc/scheduler/scheduler_state_machine.cc
+++ b/cc/scheduler/scheduler_state_machine.cc
@@ -493,7 +493,8 @@
 
   // If we only have an active tree, it is incorrect to replace it
   // before we've drawn it.
-  DCHECK(!settings_.commit_to_active_tree || !active_tree_needs_first_draw_);
+  DCHECK_IMPLIES(settings_.commit_to_active_tree,
+                 !active_tree_needs_first_draw_);
 
   return true;
 }