Remove GPU_FEATURE_TYPE_3D_CSS and --disable-accelerated-layers

content/renderer/web_preferences.cc

 // Copyright 2013 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/public/renderer/web_preferences.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "third_party/WebKit/public/platform/WebString.h"
 #include "third_party/WebKit/public/platform/WebURL.h"
 #include "third_party/WebKit/public/web/WebKit.h"
@@ skipping 213 matching lines @@
   // Enable deferred filter rendering if requested on the command line.
   settings->setDeferredFiltersEnabled(prefs.deferred_filters_enabled);
 
   // Enable container culling if requested on the command line.
   settings->setContainerCullingEnabled(prefs.container_culling_enabled);
 
   // Enable gesture tap highlight if requested on the command line.
   settings->setGestureTapHighlightEnabled(prefs.gesture_tap_highlight_enabled);
 
   // Enabling accelerated layers from the command line enabled accelerated
-  // 3D CSS, Video, and Animations.
-  settings->setAcceleratedCompositingFor3DTransformsEnabled(
-      prefs.accelerated_compositing_for_3d_transforms_enabled);
+  // Video.
   settings->setAcceleratedCompositingForVideoEnabled(
       prefs.accelerated_compositing_for_video_enabled);
-  settings->setAcceleratedCompositingForAnimationEnabled(
-      prefs.accelerated_compositing_for_animation_enabled);
 
-  // Enabling accelerated plugins if specified from the command line.
-  settings->setAcceleratedCompositingForPluginsEnabled(
-      prefs.accelerated_compositing_for_plugins_enabled);
+  // Always enable composited 3D css, animations and plugins.
+  settings->setAcceleratedCompositingFor3DTransformsEnabled(true);
+  settings->setAcceleratedCompositingForAnimationEnabled(true);
+  settings->setAcceleratedCompositingForPluginsEnabled(true);
 
   // WebGL and accelerated 2D canvas are always gpu composited.
   settings->setAcceleratedCompositingForCanvasEnabled(
       prefs.experimental_webgl_enabled || prefs.accelerated_2d_canvas_enabled);
 
   settings->setAsynchronousSpellCheckingEnabled(
       prefs.asynchronous_spell_checking_enabled);
   settings->setUnifiedTextCheckerEnabled(prefs.unified_textchecker_enabled);
 
   for (webkit_glue::WebInspectorPreferences::const_iterator it =
@@ skipping 94 matching lines @@
   settings->setPinchVirtualViewportEnabled(
       prefs.pinch_virtual_viewport_enabled);
 
   settings->setPinchOverlayScrollbarThickness(
       prefs.pinch_overlay_scrollbar_thickness);
   settings->setUseSolidColorScrollbars(prefs.use_solid_color_scrollbars);
   settings->setCompositorTouchHitTesting(prefs.compositor_touch_hit_testing);
 }
 
 }  // namespace content