Remaining code for basic tile compression functionality.

cc/base/switches.cc

Index: cc/base/switches.cc
diff --git a/cc/base/switches.cc b/cc/base/switches.cc
index b95ac111cc4d78e133e68d26a3aff72e42fdd0c4..96ae4b10d94be14eccbdc06d25596b41f4e1ee8a 100644
--- a/cc/base/switches.cc
+++ b/cc/base/switches.cc
@@ -53,6 +53,9 @@ const char kStrictLayerPropertyChangeChecking[] =
 const char kEnablePropertyTreeVerification[] =
     "enable-property-tree-verification";
 
+// Compress tile textures for GPUs supporting it.
+const char kEnableTileCompression[] = "enable-tile-compression";
+
 // Disable partial swap which is needed for some OpenGL drivers / emulators.
 const char kUIDisablePartialSwap[] = "ui-disable-partial-swap";