[Sync] Split DirectoryChangeListener for thread-safety

Split DirectoryChangeListener into DirectoryChangeDelegate and
TransactionObserver classes.  This removes a remove/notify race
condition with the DirectoryChange events.

Make syncable::{Read,Write}Transaction take Locations instead of
file/line pairs.

Move construction of sync_manager_ into sync thread.

Add logging utils in sync/logging.{h,cc}.

Add overloads to ObserverListThreadSafe::Notify for 2, 3, and 4
arguments.

Fixed 'Inital' misspelling in SyncBackendHost (finally).

BUG=85656
TEST=

Review URL: http://codereview.chromium.org/7190001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@89413 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 22 insertions, 1 deletions

diff --git a/base/observer_list_threadsafe.h b/base/observer_list_threadsafe.h
index 883e285..f4ff68d 100644
--- a/base/observer_list_threadsafe.h
+++ b/base/observer_list_threadsafe.h
@@ -148,11 +148,32 @@ class ObserverListThreadSafe
   }
 
   template <class Method, class A>
-  void Notify(Method m, const A &a) {
+  void Notify(Method m, const A& a) {
     UnboundMethod<ObserverType, Method, Tuple1<A> > method(m, MakeTuple(a));
     Notify<Method, Tuple1<A> >(method);
   }
 
+  template <class Method, class A, class B>
+  void Notify(Method m, const A& a, const B& b) {
+    UnboundMethod<ObserverType, Method, Tuple2<A, B> > method(
+        m, MakeTuple(a, b));
+    Notify<Method, Tuple2<A, B> >(method);
+  }
+
+  template <class Method, class A, class B, class C>
+  void Notify(Method m, const A& a, const B& b, const C& c) {
+    UnboundMethod<ObserverType, Method, Tuple3<A, B, C> > method(
+        m, MakeTuple(a, b, c));
+    Notify<Method, Tuple3<A, B, C> >(method);
+  }
+
+  template <class Method, class A, class B, class C, class D>
+  void Notify(Method m, const A& a, const B& b, const C& c, const D& d) {
+    UnboundMethod<ObserverType, Method, Tuple4<A, B, C, D> > method(
+        m, MakeTuple(a, b, c, d));
+    Notify<Method, Tuple4<A, B, C, D> >(method);
+  }
+
   // TODO(mbelshe):  Add more wrappers for Notify() with more arguments.
 
  private: