Revert of Remove DCHECK_IMPLIES/CHECK_IMPLIES.

cc/layers/video_layer_impl.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/layers/video_layer_impl.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "cc/layers/video_frame_provider_client_impl.h"
 #include "cc/quads/io_surface_draw_quad.h"
@@ skipping 230 matching lines @@
         DCHECK(visible_rect.origin().IsOrigin());
         DCHECK(visible_rect.size() == coded_size);
         uv_tex_size.SetSize((ya_tex_size.width() + 1) / 2,
                             (ya_tex_size.height() + 1) / 2);
       } else {
         uv_tex_size = media::VideoFrame::PlaneSize(
             frame_->format(), media::VideoFrame::kUPlane, coded_size);
         DCHECK(uv_tex_size ==
                media::VideoFrame::PlaneSize(
                    frame_->format(), media::VideoFrame::kVPlane, coded_size));
-        DCHECK(frame_resources_.size() <= 3 ||
-               ya_tex_size == media::VideoFrame::PlaneSize(
-                                  frame_->format(), media::VideoFrame::kAPlane,
-                                  coded_size));
+        DCHECK_IMPLIES(
+            frame_resources_.size() > 3,
+            ya_tex_size ==
+                media::VideoFrame::PlaneSize(
+                    frame_->format(), media::VideoFrame::kAPlane, coded_size));
       }
 
       // Compute the UV sub-sampling factor based on the ratio between
       // |ya_tex_size| and |uv_tex_size|.
       float uv_subsampling_factor_x =
           static_cast<float>(ya_tex_size.width()) / uv_tex_size.width();
       float uv_subsampling_factor_y =
           static_cast<float>(ya_tex_size.height()) / uv_tex_size.height();
       gfx::RectF ya_tex_coord_rect(visible_rect);
       gfx::RectF uv_tex_coord_rect(
@@ skipping 137 matching lines @@
 void VideoLayerImpl::SetNeedsRedraw() {
   SetUpdateRect(gfx::UnionRects(update_rect(), gfx::Rect(bounds())));
   layer_tree_impl()->SetNeedsRedraw();
 }
 
 const char* VideoLayerImpl::LayerTypeAsString() const {
   return "cc::VideoLayerImpl";
 }
 
 }  // namespace cc