cc: one copy is default as well as final fallback.

content/renderer/render_thread_impl.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.
 
 #include "content/renderer/render_thread_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <vector>
@@ skipping 689 matching lines @@
 
   const base::CommandLine& command_line =
       *base::CommandLine::ForCurrentProcess();
 
   cc::LayerSettings layer_settings;
   if (command_line.HasSwitch(switches::kEnableCompositorAnimationTimelines))
     layer_settings.use_compositor_animation_timelines = true;
   cc_blink::WebLayerImpl::SetLayerSettings(layer_settings);
 
   is_zero_copy_enabled_ = command_line.HasSwitch(switches::kEnableZeroCopy);
-  is_one_copy_enabled_ = !command_line.HasSwitch(switches::kDisableOneCopy);
 
 #if defined(OS_MACOSX) && !defined(OS_IOS)
   is_elastic_overscroll_enabled_ = base::mac::IsOSLionOrLater();
   if (is_elastic_overscroll_enabled_) {
     base::ScopedCFTypeRef<CFStringRef> key(
         base::SysUTF8ToCFStringRef("NSScrollViewRubberbanding"));
     Boolean key_exists = false;
     Boolean value = CFPreferencesGetAppBooleanValue(
         key, kCFPreferencesCurrentApplication, &key_exists);
     if (key_exists && !value)
@@ skipping 794 matching lines @@
 }
 
 bool RenderThreadImpl::IsDistanceFieldTextEnabled() {
   return is_distance_field_text_enabled_;
 }
 
 bool RenderThreadImpl::IsZeroCopyEnabled() {
   return is_zero_copy_enabled_;
 }
 
-bool RenderThreadImpl::IsOneCopyEnabled() {
-  return is_one_copy_enabled_;
-}
-
 bool RenderThreadImpl::IsElasticOverscrollEnabled() {
   return is_elastic_overscroll_enabled_;
 }
 
 uint32 RenderThreadImpl::GetImageTextureTarget() {
   return use_image_texture_target_;
 }
 
 scoped_refptr<base::SingleThreadTaskRunner>
 RenderThreadImpl::GetCompositorMainThreadTaskRunner() {
@@ skipping 456 matching lines @@
 }
 
 void RenderThreadImpl::PendingRenderFrameConnect::OnConnectionError() {
   size_t erased =
       RenderThreadImpl::current()->pending_render_frame_connects_.erase(
           routing_id_);
   DCHECK_EQ(1u, erased);
 }
 
 }  // namespace content