[android_webview] Do not declare WebView visible on detaching from window.

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 <stddef.h>
 
 #include <map>
@@ skipping 127 matching lines @@
   void RemoveCompositorFrameConsumer(
       CompositorFrameConsumer* compositor_frame_consumer) override;
 
   void SetActiveCompositorID(const CompositorID& compositor_id);
 
   // Visible for testing.
   content::SynchronousCompositor* GetActiveCompositorForTesting() const {
     return compositor_;
   }
 
+  bool window_visible_for_tests() const { return window_visible_; }
+
  private:
   void SetTotalRootLayerScrollOffset(const gfx::Vector2dF& new_value_dip);
   bool CanOnDraw();
   bool CompositeSW(SkCanvas* canvas);
   std::unique_ptr<base::trace_event::ConvertableToTraceFormat>
   RootLayerStateAsValue(const gfx::Vector2dF& total_scroll_offset_dip,
                         const gfx::SizeF& scrollable_size_dip);
 
   void ReturnUncommittedFrames(ChildFrameQueue frame);
   void ReturnUnusedResource(std::unique_ptr<ChildFrame> frame);
@@ skipping 28 matching lines @@
   // a compositor is destroyed.
   std::map<CompositorID,
            content::SynchronousCompositor*,
            CompositorIDComparator>
       compositor_map_;
 
   bool is_paused_;
   bool view_visible_;
   bool window_visible_;  // Only applicable if |attached_to_window_| is true.
   bool attached_to_window_;
+  bool was_attached_;  // Whether the view was attached to window at least once.
   bool hardware_enabled_;
   float dip_scale_;
   float page_scale_factor_;
   float min_page_scale_factor_;
   float max_page_scale_factor_;
   bool on_new_picture_enable_;
   bool clear_view_;
 
   bool offscreen_pre_raster_;
 
@@ skipping 27 matching lines @@
   gfx::Vector2dF overscroll_rounding_error_;
 
   ParentCompositorDrawConstraints external_draw_constraints_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserViewRenderer);
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_BROWSER_BROWSER_VIEW_RENDERER_H_