Do not block in OwnershipService::IsAlreadyOwned on UI thread.

Moved all stuff related to GetOwnershipStatus from user_cros_settings.cc where it was irrelevant to OwnershipService.
Prefetch and cache ownership status in order not to block on UI thread.

BUG=chromium:70097
TEST=Manual

Review URL: http://codereview.chromium.org/6538057

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@75617 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 14 insertions, 1 deletions

diff --git a/base/lazy_instance.h b/base/lazy_instance.h
index f4cfda0..e50902d 100644
--- a/base/lazy_instance.h
+++ b/base/lazy_instance.h
@@ -127,7 +127,7 @@ class LazyInstance : public LazyInstanceHelper {
         NeedsInstance()) {
       // Create the instance in the space provided by |buf_|.
       instance_ = Traits::New(buf_);
-      // Traits::Delete will be null for LeakyLazyInstannceTraits
+      // Traits::Delete will be null for LeakyLazyInstanceTraits
       void (*dtor)(void*) = Traits::Delete;
       CompleteInstance(this, (dtor == NULL) ? NULL : OnExit);
     }
@@ -141,6 +141,19 @@ class LazyInstance : public LazyInstanceHelper {
     return instance_;
   }
 
+  bool operator==(Type* p) {
+    switch (base::subtle::NoBarrier_Load(&state_)) {
+      case STATE_EMPTY:
+        return p == NULL;
+      case STATE_CREATING:
+        return static_cast<int8*>(static_cast<void*>(p)) == buf_;
+      case STATE_CREATED:
+        return p == instance_;
+      default:
+        return false;
+    }
+  }
+
  private:
   // Adapter function for use with AtExit.  This should be called single
   // threaded, so don't use atomic operations.