Move navigation and frame tree classes to a new frame_host/ directory.

content/browser/web_contents/web_contents_screenshot_manager.h

-// Copyright (c) 2013 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_WEB_CONTENTS_SCREENSHOT_MANAGER_H_
-#define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_SCREENSHOT_MANAGER_H_
-
-#include "base/compiler_specific.h"
-#include "base/memory/weak_ptr.h"
-#include "base/time/time.h"
-#include "content/common/content_export.h"
-
-class SkBitmap;
-
-namespace content {
-
-class NavigationControllerImpl;
-class NavigationEntryImpl;
-class RenderViewHost;
-class ScreenshotData;
-
-// WebContentsScreenshotManager takes care of taking image-captures for the
-// current navigation entry of a NavigationControllerImpl, and managing these
-// captured images. These image-captures are used for history navigation using
-// overscroll gestures.
-class CONTENT_EXPORT WebContentsScreenshotManager {
- public:
-  explicit WebContentsScreenshotManager(NavigationControllerImpl* controller);
-  virtual ~WebContentsScreenshotManager();
-
-  // Takes a screenshot of the last-committed entry of the controller.
-  void TakeScreenshot();
-
-  // Clears screenshots of all navigation entries.
-  void ClearAllScreenshots();
-
- protected:
-  virtual void TakeScreenshotImpl(RenderViewHost* host,
-                                  NavigationEntryImpl* entry);
-
-  // Called after a screenshot has been set on an NavigationEntryImpl.
-  // Overridden in tests to get notified of when a screenshot is set.
-  virtual void OnScreenshotSet(NavigationEntryImpl* entry);
-
-  NavigationControllerImpl* owner() { return owner_; }
-
-  void SetMinScreenshotIntervalMS(int interval_ms);
-
-  // 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,
-                         bool success,
-                         const SkBitmap& bitmap);
-
-  // Returns the number of entries with screenshots.
-  int GetScreenshotCount() const;
-
- private:
-  // This is called when the screenshot data has beene encoded to PNG in a
-  // worker thread.
-  void OnScreenshotEncodeComplete(int unique_id,
-                                  scoped_refptr<ScreenshotData> data);
-
-  // Removes the screenshot for the entry, returning true if the entry had a
-  // screenshot.
-  bool ClearScreenshot(NavigationEntryImpl* entry);
-
-  // The screenshots in the NavigationEntryImpls can accumulate and consume a
-  // large amount of memory. This function makes sure that the memory
-  // consumption is within a certain limit.
-  void PurgeScreenshotsIfNecessary();
-
-  // The navigation controller that owns this screenshot-manager.
-  NavigationControllerImpl* owner_;
-
-  // Taking a screenshot and encoding them can be async. So use a weakptr for
-  // the callback to make sure that the screenshot/encoding completion callback
-  // does not trigger on a destroyed WebContentsScreenshotManager.
-  base::WeakPtrFactory<WebContentsScreenshotManager> screenshot_factory_;
-
-  base::Time last_screenshot_time_;
-  int min_screenshot_interval_ms_;
-
-  DISALLOW_COPY_AND_ASSIGN(WebContentsScreenshotManager);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_SCREENSHOT_MANAGER_H_