Move tracing namespace from base::debug to base::trace_event.

cc/quads/shared_quad_state.h

Index: cc/quads/shared_quad_state.h
diff --git a/cc/quads/shared_quad_state.h b/cc/quads/shared_quad_state.h
index ebf7d11986e01a30661fd73ac7a15bddbb312058..6c2cd70b112daf2c3bea6cde98065520d7d93078 100644
--- a/cc/quads/shared_quad_state.h
+++ b/cc/quads/shared_quad_state.h
@@ -12,11 +12,18 @@
 #include "ui/gfx/transform.h"
 
 namespace base {
-namespace debug {
+namespace trace_event {
 class TracedValue;
 }
+

[Primiano Tucci (use gerrit), 2015/02/03 10:42:36]

ditto

 class Value;
+// This is added temporarily. Once the renaming of namespace usages
+// accross all folders are done, this will be removed.
+// TODO(ssid): crrev.com/837303004
+namespace debug {
+using ::base::trace_event::TracedValue;
 }
+}  // namespace base
 
 namespace cc {