overscroll: Take a screenshot at more appropriate times.

content/browser/web_contents/navigation_controller_impl.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.
 
 #ifndef CONTENT_BROWSER_WEB_CONTENTS_NAVIGATION_CONTROLLER_IMPL_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_NAVIGATION_CONTROLLER_IMPL_H_
 
 #include "build/build_config.h"
 #include "base/callback.h"
 #include "base/compiler_specific.h"
@@ skipping 181 matching lines @@
 
   // Maximum number of entries before we start removing entries from the front.
   static void set_max_entry_count_for_testing(size_t max_entry_count) {
     max_entry_count_for_testing_ = max_entry_count;
   }
   static size_t max_entry_count();
 
   void SetGetTimestampCallbackForTest(
       const base::Callback<base::Time()>& get_timestamp_callback);
 
+  // Takes a screenshot of the page at the current state.
+  void TakeScreenshot();
+
  private:
   friend class RestoreHelper;
   friend class WebContentsImpl;  // For invoking OnReservedPageIDRange.
 
   FRIEND_TEST_ALL_PREFIXES(TimeSmoother, Basic);
   FRIEND_TEST_ALL_PREFIXES(TimeSmoother, SingleDuplicate);
   FRIEND_TEST_ALL_PREFIXES(TimeSmoother, ManyDuplicates);
   FRIEND_TEST_ALL_PREFIXES(TimeSmoother, ClockBackwardsJump);
 
   // Helper class to smooth out runs of duplicate timestamps while still
@@ skipping 93 matching lines @@
   // Inserts up to |max_index| entries from |source| into this. This does NOT
   // adjust any of the members that reference entries_
   // (last_committed_entry_index_, pending_entry_index_ or
   // transient_entry_index_).
   void InsertEntriesFrom(const NavigationControllerImpl& source, int max_index);
 
   // Returns the navigation index that differs from the current entry by the
   // specified |offset|.  The index returned is not guaranteed to be valid.
   int GetIndexForOffset(int offset) const;
 
-  // Takes a screenshot of the page at the current state.
-  void TakeScreenshot();
-
   // The callback invoked when taking the screenshot of the page is complete.
   // This sets the screenshot on the navigation entry.
   void OnScreenshotTaken(int unique_id,
                          skia::PlatformBitmap* bitmap,
                          bool success);
 
   // ---------------------------------------------------------------------------
 
   // The user browser context associated with this controller.
   BrowserContext* browser_context_;
@@ skipping 69 matching lines @@
   // the timer resolution, leading to things sometimes showing up in
   // the wrong order in the history view.
   TimeSmoother time_smoother_;
 
   DISALLOW_COPY_AND_ASSIGN(NavigationControllerImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_NAVIGATION_CONTROLLER_IMPL_H_