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

cc/resources/zero_copy_tile_task_worker_pool.h

Index: cc/resources/zero_copy_tile_task_worker_pool.h
diff --git a/cc/resources/zero_copy_tile_task_worker_pool.h b/cc/resources/zero_copy_tile_task_worker_pool.h
index 8d3c0cfbd10120d69faca2523ac9142fc9c02908..19d596d8b8f14e98649c6d582192ee8d0ac22f68 100644
--- a/cc/resources/zero_copy_tile_task_worker_pool.h
+++ b/cc/resources/zero_copy_tile_task_worker_pool.h
@@ -11,9 +11,12 @@
 #include "cc/resources/tile_task_worker_pool.h"
 
 namespace base {
-namespace debug {
+namespace trace_event {
 class ConvertableToTraceFormat;
 }
+namespace debug {
+using ::base::trace_event::ConvertableToTraceFormat;

[Primiano Tucci (use gerrit), 2015/01/27 14:34:11]

nit: blankline

+}
 }
 
 namespace cc {