Clipboard Android - Store and Read Last Modified Time from Prefs

ui/base/clipboard/clipboard_android.h

 // Copyright 2014 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.
 
 #ifndef UI_BASE_CLIPBOARD_CLIPBOARD_ANDROID_H_
 #define UI_BASE_CLIPBOARD_CLIPBOARD_ANDROID_H_
 
 #include "ui/base/clipboard/clipboard.h"
 
 #include <jni.h>
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/android/scoped_java_ref.h"
 #include "base/macros.h"
 #include "base/time/time.h"
 
+class PrefService;
+class PrefRegistrySimple;
+
 namespace ui {
 
-class ClipboardAndroid : public Clipboard {
+// Exported only so chrome/browser/android/preferences/browser_prefs_android.cc
+// can call RegisterPrefs().
+class UI_BASE_EXPORT ClipboardAndroid : public Clipboard {
  public:
+  static void RegisterPrefs(PrefRegistrySimple* registry);

[dcheng, 2017/04/22 01:43:01]

Could just export this one helper too.

[Mark P, 2017/04/24 17:33:26]

Ah, I didn't know I could export individual functions, not whole classes.

Exported this function and the one below it and ceased exporting the whole
class.

+
+  // Called during startup when local state is available to store a pointer to
+  // local_state in order to read and update prefs.
+  void SetLocalState(PrefService* local_state);
+
   // Called by Java when the Java Clipboard is notified that the clipboard has
   // changed.
   void OnPrimaryClipChanged(JNIEnv* env,
                             const base::android::JavaParamRef<jobject>& obj);
 
  private:
   friend class Clipboard;
 
   ClipboardAndroid();
   ~ClipboardAndroid() override;
@@ skipping 42 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(ClipboardAndroid);
 };
 
 // Registers the ClipboardAndroid native method.
 bool RegisterClipboardAndroid(JNIEnv* env);
 
 }  // namespace ui
 
 #endif  // UI_BASE_CLIPBOARD_CLIPBOARD_ANDROID_H_