content/blimp: Set up hooks for enabling LTHRemote in the renderer.

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index 41c636f03c7c2fa845fd949ae15eae2f8e68b1fa..3c11429c8fce8216dacbde22c13b60ebedb92c7a 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -860,6 +860,10 @@ const char kContentImageTextureTarget[] = "content-image-texture-target";
 // Texture target for CHROMIUM_image backed video frame textures.
 const char kVideoImageTextureTarget[] = "video-image-texture-target";
 
+// Used in conjunction with kUseRemoteCompositing to enable the updated remote
+// compositing path using cc::LayerTreeHostRemote.
+const char kUseLayerTreeHostRemote[] = "use-layer-tree-host-remote";
+
 // Set when Chromium should use a mobile user agent.
 const char kUseMobileUserAgent[] = "use-mobile-user-agent";