Revert of Remove DCHECK_IMPLIES/CHECK_IMPLIES.

cc/playback/display_item_list.cc

Index: cc/playback/display_item_list.cc
diff --git a/cc/playback/display_item_list.cc b/cc/playback/display_item_list.cc
index 40194f748e883a3d3b30c26ac66bd20de012cfb8..7614bfd8a2fc81a5fcaf2e783e98b5572f05e13e 100644
--- a/cc/playback/display_item_list.cc
+++ b/cc/playback/display_item_list.cc
@@ -203,7 +203,7 @@
   if (use_cached_picture_ && retain_individual_display_items_)
     return 0;
 
-  DCHECK(!use_cached_picture_ || picture_);
+  DCHECK_IMPLIES(use_cached_picture_, picture_);
 
   size_t memory_usage = sizeof(*this);
 
@@ -273,7 +273,7 @@
   DCHECK(ProcessAppendedItemsCalled());
   // This should be only called once, and only after CreateAndCacheSkPicture.
   DCHECK(image_map_.empty());
-  DCHECK(!use_cached_picture_ || picture_);
+  DCHECK_IMPLIES(use_cached_picture_, picture_);
   if (use_cached_picture_ && !picture_->willPlayBackBitmaps())
     return;