Refactor BrowserViewRenderer to support page visibility

android_webview/browser/browser_view_renderer.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 ANDROID_WEBVIEW_BROWSER_BROWSER_VIEW_RENDERER_H_
 #define ANDROID_WEBVIEW_BROWSER_BROWSER_VIEW_RENDERER_H_
 
 #include "android_webview/browser/parent_compositor_draw_constraints.h"
 #include "android_webview/browser/shared_renderer_state.h"
 #include "base/callback.h"
@@ skipping 75 matching lines @@
   void ScrollTo(gfx::Vector2d new_value);
 
   // Android views hierarchy gluing.
   bool IsVisible() const;
   gfx::Rect GetScreenRect() const;
   bool attached_to_window() const { return attached_to_window_; }
   bool hardware_enabled() const { return hardware_enabled_; }
   gfx::Size size() const { return size_; }
   void ReleaseHardware();
 
+  bool IsClientVisible() const;
   void TrimMemory(const int level, const bool visible);
 
   // SynchronousCompositorClient overrides.
   void DidInitializeCompositor(
       content::SynchronousCompositor* compositor) override;
   void DidDestroyCompositor(
       content::SynchronousCompositor* compositor) override;
   void PostInvalidate() override;
   void DidUpdateContent() override;
   void UpdateRootLayerState(const gfx::Vector2dF& total_scroll_offset_dip,
@@ skipping 66 matching lines @@
   bool clear_view_;
 
   bool offscreen_pre_raster_;
 
   gfx::Vector2d last_on_draw_scroll_offset_;
   gfx::Rect last_on_draw_global_visible_rect_;
 
   base::CancelableClosure post_fallback_tick_;
   base::CancelableClosure fallback_tick_fired_;
   bool fallback_tick_pending_;
+  bool disable_page_visibility_;
 
   gfx::Size size_;
 
   gfx::SizeF scrollable_size_dip_;
 
   // Current scroll offset in CSS pixels.
   // TODO(miletus): Make scroll_offset_dip_ a gfx::ScrollOffset.
   gfx::Vector2dF scroll_offset_dip_;
 
   // Max scroll offset in CSS pixels.
   // TODO(miletus): Make max_scroll_offset_dip_ a gfx::ScrollOffset.
   gfx::Vector2dF max_scroll_offset_dip_;
 
   // Used to prevent rounding errors from accumulating enough to generate
   // visible skew (especially noticeable when scrolling up and down in the same
   // spot over a period of time).
   // TODO(miletus): Make overscroll_rounding_error_ a gfx::ScrollOffset.
   gfx::Vector2dF overscroll_rounding_error_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserViewRenderer);
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_BROWSER_BROWSER_VIEW_RENDERER_H_