Reland: Remove DCHECK_IMPLIES/CHECK_IMPLIES.

cc/test/fake_display_list_raster_source.cc

 // Copyright 2015 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/test/fake_display_list_raster_source.h"
 
 #include <limits>
 
 #include "base/synchronization/waitable_event.h"
 #include "cc/test/fake_display_list_recording_source.h"
@@ skipping 64 matching lines @@
       new FakeDisplayListRasterSource(recording_source.get(), false));
   if (!raster_source->IsSolidColor())
     ADD_FAILURE() << "Not solid color!";
   return raster_source;
 }
 
 scoped_refptr<FakeDisplayListRasterSource>
 FakeDisplayListRasterSource::CreatePartiallyFilled(
     const gfx::Size& size,
     const gfx::Rect& recorded_viewport) {
-  DCHECK_IMPLIES(!recorded_viewport.IsEmpty(),
-                 gfx::Rect(size).Contains(recorded_viewport));
+  DCHECK(recorded_viewport.IsEmpty() ||
+         gfx::Rect(size).Contains(recorded_viewport));
   auto recording_source = FakeDisplayListRecordingSource::CreateRecordingSource(
       recorded_viewport, size);
 
   SkPaint red_paint;
   red_paint.setColor(SK_ColorRED);
   recording_source->add_draw_rect_with_paint(gfx::Rect(size), red_paint);
 
   gfx::Size smaller_size(size.width() - 10, size.height() - 10);
   SkPaint green_paint;
   green_paint.setColor(SK_ColorGREEN);
@@ skipping 52 matching lines @@
     const gfx::Rect& canvas_bitmap_rect,
     const gfx::Rect& canvas_playback_rect,
     float contents_scale) const {
   if (playback_allowed_event_)
     playback_allowed_event_->Wait();
   DisplayListRasterSource::PlaybackToCanvas(
       canvas, canvas_bitmap_rect, canvas_playback_rect, contents_scale);
 }
 
 }  // namespace cc