Revert of Remove DCHECK_IMPLIES/CHECK_IMPLIES.

ui/views/view.cc

 // Copyright (c) 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.
 
 #define _USE_MATH_DEFINES // For VC++ to get M_PI. This has to be first.
 
 #include "ui/views/view.h"
 
 #include <algorithm>
 #include <cmath>
@@ skipping 724 matching lines @@
 void View::Paint(const ui::PaintContext& parent_context) {
   if (!visible_)
     return;
   if (size().IsEmpty())
     return;
 
   gfx::Vector2d offset_to_parent;
   if (!layer()) {
     // If the View has a layer() then it is a paint root. Otherwise, we need to
     // add the offset from the parent into the total offset from the paint root.
-    DCHECK(parent() || bounds().origin() == gfx::Point());
+    DCHECK_IMPLIES(!parent(), bounds().origin() == gfx::Point());
     offset_to_parent = GetMirroredPosition().OffsetFromOrigin();
   }
   ui::PaintContext context(parent_context, offset_to_parent);
 
   bool is_invalidated = true;
   if (context.CanCheckInvalid()) {
 #if DCHECK_IS_ON()
     gfx::Vector2d offset;
     context.Visited(this);
     View* view = this;
@@ skipping 1598 matching lines @@
   // Message the RootView to do the drag and drop. That way if we're removed
   // the RootView can detect it and avoid calling us back.
   gfx::Point widget_location(event.location());
   ConvertPointToWidget(this, &widget_location);
   widget->RunShellDrag(this, data, widget_location, drag_operations, source);
   // WARNING: we may have been deleted.
   return true;
 }
 
 }  // namespace views