Reland: Remove DCHECK_IMPLIES/CHECK_IMPLIES.

cc/trees/layer_tree_host_common.cc

 // Copyright 2011 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/trees/layer_tree_host_common.h"
 
 #include <algorithm>
 
 #include "base/trace_event/trace_event.h"
 #include "cc/base/math_util.h"
@@ skipping 397 matching lines @@
       break;
     }
 
     // Transform rect from the current target's space to the next.
     LayerImpl* current_target = current_state->render_target;
     DCHECK(current_target->render_surface());
     const gfx::Transform& current_draw_transform =
          current_target->render_surface()->draw_transform();
 
     // If we have unclipped descendants, the draw transform is a translation.
-    DCHECK_IMPLIES(current_target->num_unclipped_descendants(),
-                   current_draw_transform.IsIdentityOrTranslation());
+    DCHECK(!current_target->num_unclipped_descendants() ||
+           current_draw_transform.IsIdentityOrTranslation());
 
     target_rect =
         MathUtil::MapEnclosingClippedRect(current_draw_transform, target_rect);
   }
 
   // It is an error to not reach |render_target|. If this happens, it means that
   // either the clip parent is not an ancestor of the clip child or the surface
   // state vector is empty, both of which should be impossible.
   DCHECK(found_render_target);
 }
@@ skipping 2345 matching lines @@
 
 PropertyTrees* GetPropertyTrees(Layer* layer) {
   return layer->layer_tree_host()->property_trees();
 }
 
 PropertyTrees* GetPropertyTrees(LayerImpl* layer) {
   return layer->layer_tree_impl()->property_trees();
 }
 
 }  // namespace cc