Move timing files into base/time, install forwarding headers.

base/timer/timer.h

Index: base/timer/timer.h
diff --git a/base/timer.h b/base/timer/timer.h
similarity index 98%
copy from base/timer.h
copy to base/timer/timer.h
index bbcbae27d9583453b5040782d087b8c56901726a..23b1d3c507c7270f770f79018de80d17296b3517 100644
--- a/base/timer.h
+++ b/base/timer/timer.h
@@ -41,8 +41,8 @@
 //
 // NOTE: These APIs are not thread safe. Always call from the same thread.
 
-#ifndef BASE_TIMER_H_
-#define BASE_TIMER_H_
+#ifndef BASE_TIMER_TIMER_H_
+#define BASE_TIMER_TIMER_H_
 
 // IMPORTANT: If you change timer code, make sure that all tests (including
 // disabled ones) from timer_unittests.cc pass locally. Some are disabled
@@ -54,7 +54,7 @@
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/location.h"
-#include "base/time.h"
+#include "base/time/time.h"
 
 namespace base {
 
@@ -243,4 +243,4 @@ class DelayTimer : protected Timer {
 
 }  // namespace base
 
-#endif  // BASE_TIMER_H_
+#endif  // BASE_TIMER_TIMER_H_