Ash devtools: Add support for changing visibility.

ash/common/devtools/ash_devtools_css_agent.h

 // Copyright 2016 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 ASH_COMMON_DEVTOOLS_ASH_DEVTOOLS_CSS_AGENT_H_
 #define ASH_COMMON_DEVTOOLS_ASH_DEVTOOLS_CSS_AGENT_H_
 
 #include "ash/common/devtools/ash_devtools_dom_agent.h"
 #include "components/ui_devtools/CSS.h"
 #include "ui/views/widget/widget_observer.h"
@@ skipping 25 matching lines @@
 
   // AshDevToolsDOMAgentObserver
   void OnWindowBoundsChanged(WmWindow* window) override;
   void OnWidgetBoundsChanged(views::Widget* widget) override;
   void OnViewBoundsChanged(views::View* view) override;
 
  private:
   std::unique_ptr<ui::devtools::protocol::CSS::CSSStyle> GetStylesForNode(
       int node_id);
   void InvalidateStyleSheet(int node_id);
-  bool GetBoundsForNodeId(int node_id, gfx::Rect* bounds);
-  bool UpdateBounds(int node_id, const gfx::Rect& bounds);
-
+  bool GetPropertiesForNodeId(int node_id, gfx::Rect* bounds, bool* visible);
+  bool SetPropertiesForNodeId(int node_id,
+                              const gfx::Rect& bounds,
+                              const bool visible);

[varkha, 2017/03/10 20:17:58]

Not sure if const is necessary for simple types passed as input.

   AshDevToolsDOMAgent* dom_agent_;
 
   DISALLOW_COPY_AND_ASSIGN(AshDevToolsCSSAgent);
 };
 
 }  // namespace devtools
 }  // namespace ash
 
 #endif  // ASH_COMMON_DEVTOOLS_ASH_DEVTOOLS_CSS_AGENT_H_