Reduce usage of MessageLoopProxy in base/

base/prefs/pref_member.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // A helper class that stays in sync with a preference (bool, int, real,
 // string or filepath).  For example:
 //
 // class MyClass {
 //  public:
 //   MyClass(PrefService* prefs) {
@@ skipping 15 matching lines @@
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/callback_forward.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
-#include "base/message_loop/message_loop_proxy.h"
 #include "base/prefs/base_prefs_export.h"
 #include "base/prefs/pref_observer.h"
+#include "base/sequenced_task_runner.h"
 #include "base/values.h"
 
 class PrefService;
 
 namespace subtle {
 
 class BASE_PREFS_EXPORT PrefMemberBase : public PrefObserver {
  public:
   // Type of callback you can register if you need to know the name of
   // the pref that is changing.
   typedef base::Callback<void(const std::string&)> NamedChangeCallback;
 
   PrefService* prefs() { return prefs_; }
   const PrefService* prefs() const { return prefs_; }
 
  protected:
   class BASE_PREFS_EXPORT Internal
       : public base::RefCountedThreadSafe<Internal> {
    public:
     Internal();
 
     // Update the value, either by calling |UpdateValueInternal| directly
     // or by dispatching to the right thread.
     // Takes ownership of |value|.
     void UpdateValue(base::Value* value,
                      bool is_managed,
                      bool is_user_modifiable,
                      const base::Closure& callback) const;
 
-    void MoveToThread(
-        const scoped_refptr<base::MessageLoopProxy>& message_loop);
+    void MoveToTaskRunner(
+        const scoped_refptr<base::SequencedTaskRunner>& task_runner);
 
     // See PrefMember<> for description.
     bool IsManaged() const {
       return is_managed_;
     }
 
     bool IsUserModifiable() const {
       return is_user_modifiable_;
     }
 
    protected:
     friend class base::RefCountedThreadSafe<Internal>;
     virtual ~Internal();
 
     void CheckOnCorrectThread() const {
       DCHECK(IsOnCorrectThread());
     }
 
    private:
     // This method actually updates the value. It should only be called from
     // the thread the PrefMember is on.
     virtual bool UpdateValueInternal(const base::Value& value) const = 0;
 
     bool IsOnCorrectThread() const;
 
-    scoped_refptr<base::MessageLoopProxy> thread_loop_;
+    scoped_refptr<base::SequencedTaskRunner> task_runner_;
     mutable bool is_managed_;
     mutable bool is_user_modifiable_;
 
     DISALLOW_COPY_AND_ASSIGN(Internal);
   };
 
   PrefMemberBase();
   virtual ~PrefMemberBase();
 
   // See PrefMember<> for description.
   void Init(const char* pref_name, PrefService* prefs,
             const NamedChangeCallback& observer);
   void Init(const char* pref_name, PrefService* prefs);
 
   virtual void CreateInternal() const = 0;
 
   // See PrefMember<> for description.
   void Destroy();
 
-  void MoveToThread(const scoped_refptr<base::MessageLoopProxy>& message_loop);
+  void MoveToTaskRunner(
+      const scoped_refptr<base::SequencedTaskRunner>& task_runner);
 
   // PrefObserver
   virtual void OnPreferenceChanged(PrefService* service,
                                    const std::string& pref_name) OVERRIDE;
 
   void VerifyValuePrefName() const {
     DCHECK(!pref_name_.empty());
   }
 
   // This method is used to do the actual sync with the preference.
@@ skipping 51 matching lines @@
     subtle::PrefMemberBase::Init(
         pref_name, prefs,
         base::Bind(&PrefMemberBase::InvokeUnnamedCallback, observer));
   }
   void Init(const char* pref_name, PrefService* prefs) {
     subtle::PrefMemberBase::Init(pref_name, prefs);
   }
 
   // Unsubscribes the PrefMember from the PrefService. After calling this
   // function, the PrefMember may not be used any more on the UI thread.
-  // Assuming |MoveToThread| was previously called, |GetValue|, |IsManaged|,
+  // Assuming |MoveToTaskRunner| was previously called, |GetValue|, |IsManaged|,
   // and |IsUserModifiable| can still be called from the other thread but
   // the results will no longer update from the PrefService.
   // This method should only be called on the UI thread.
   void Destroy() {
     subtle::PrefMemberBase::Destroy();
   }
 
   // Moves the PrefMember to another thread, allowing read accesses from there.
   // Changes from the PrefService will be propagated asynchronously
   // via PostTask.
   // This method should only be used from the thread the PrefMember is currently
   // on, which is the UI thread by default.
-  void MoveToThread(const scoped_refptr<base::MessageLoopProxy>& message_loop) {
-    subtle::PrefMemberBase::MoveToThread(message_loop);
+  void MoveToTaskRunner(
+      const scoped_refptr<base::SequencedTaskRunner>& task_runner) {
+    subtle::PrefMemberBase::MoveToTaskRunner(task_runner);
   }
 
   // Check whether the pref is managed, i.e. controlled externally through
   // enterprise configuration management (e.g. windows group policy). Returns
   // false for unknown prefs.
   // This method should only be used from the thread the PrefMember is currently
-  // on, which is the UI thread unless changed by |MoveToThread|.
+  // on, which is the UI thread unless changed by |MoveToTaskRunner|.
   bool IsManaged() const {
     VerifyPref();
     return internal_->IsManaged();
   }
 
   // Checks whether the pref can be modified by the user. This returns false
   // when the pref is managed by a policy or an extension, and when a command
   // line flag overrides the pref.
   // This method should only be used from the thread the PrefMember is currently
-  // on, which is the UI thread unless changed by |MoveToThread|.
+  // on, which is the UI thread unless changed by |MoveToTaskRunner|.
   bool IsUserModifiable() const {
     VerifyPref();
     return internal_->IsUserModifiable();
   }
 
   // Retrieve the value of the member variable.
   // This method should only be used from the thread the PrefMember is currently
-  // on, which is the UI thread unless changed by |MoveToThread|.
+  // on, which is the UI thread unless changed by |MoveToTaskRunner|.
   ValueType GetValue() const {
     VerifyPref();
     return internal_->value();
   }
 
   // Provided as a convenience.
   ValueType operator*() const {
     return GetValue();
   }
 
@@ skipping 106 matching lines @@
 
 typedef PrefMember<bool> BooleanPrefMember;
 typedef PrefMember<int> IntegerPrefMember;
 typedef PrefMember<double> DoublePrefMember;
 typedef PrefMember<std::string> StringPrefMember;
 typedef PrefMember<base::FilePath> FilePathPrefMember;
 // This preference member is expensive for large string arrays.
 typedef PrefMember<std::vector<std::string> > StringListPrefMember;
 
 #endif  // BASE_PREFS_PREF_MEMBER_H_