Chromium side plumbing for enabling fixed root background compositing.

content/public/common/content_switches.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/public/common/content_switches.h"
 
 namespace switches {
 
 // By default, file:// URIs cannot read other file:// URIs. This is an
 // override for developers who need the old behavior for testing.
@@ skipping 623 matching lines @@
 
 // Causes the renderer process to display a dialog on launch.
 const char kRendererStartupDialog[]         = "renderer-startup-dialog";
 
 // Enables accelerated compositing for overflow scroll. Promotes eligible
 // overflow:scroll elements to layers to enable accelerated scrolling for them.
 const char kEnableAcceleratedOverflowScroll[] =
     "enable-accelerated-overflow-scroll";
 
 // Disables accelerated compositing for overflow scroll.
-extern const char kDisableAcceleratedOverflowScroll[] =
+const char kDisableAcceleratedOverflowScroll[] =
     "disable-accelerated-overflow-scroll";
 
 // Enables accelerated compositing for scrollable frames for accelerated
 // scrolling for them. Requires kForceCompositingMode.
 const char kEnableAcceleratedScrollableFrames[] =
      "enable-accelerated-scrollable-frames";
 
 // Enables accelerated scrolling by the compositor for frames. Requires
 // kForceCompositingMode and kEnableAcceleratedScrollableFrames.
 const char kEnableCompositedScrollingForFrames[] =
@@ skipping 194 matching lines @@
 
 // Forward overscroll event data from the renderer to the browser.
 const char kEnableOverscrollNotifications[] = "enable-overscroll-notifications";
 
 // Enables 'image/webp' accept header for image requests.
 const char kEnableWebPInAcceptHeader[] = "enable-webp-in-accept-header";
 
 // Enables WebGL extensions not yet approved by the community.
 const char kEnableWebGLDraftExtensions[] = "enable-webgl-draft-extensions";
 
+// Enables/disables accelerated compositing for backgrounds of root layers with
+// background-attachment: fixed. Requires kForceCompositingMode.
+const char kDisableAcceleratedFixedRootBackground[] =
+    "disable-accelerated-fixed-root-background";
+const char kEnableAcceleratedFixedRootBackground[] =
+    "enable-accelerated-fixed-root-background";
+
 }  // namespace switches