Aura Icon Capture

ui/aura/window.h

Index: ui/aura/window.h
diff --git a/ui/aura/window.h b/ui/aura/window.h
index 89b24bbf02ac9df8768b67404175cc2578338ff9..41e52cc8877c0398a35011e5ebc244849d633617 100644
--- a/ui/aura/window.h
+++ b/ui/aura/window.h
@@ -110,6 +110,9 @@ class AURA_EXPORT Window : public ui::LayerDelegate,
   const base::string16 title() const { return title_; }
   void SetTitle(const base::string16& title);
 
+  const gfx::ImageSkia icon() const { return icon_; }

[sky, 2016/08/08 19:19:47]

We generally do not add state like this to Window directly, rather to the
properties (see SetProperty). For an example of what I'm suggesting, look at
kShowStateKey.

[qiangchen, 2016/08/09 16:48:40]

I encounted some difficulty doing that way.
Simply creating a const of type WindowProperty<gfx::ImageSkia> does not compile
because there is no cast from gfx::ImageSkia to Int64. 

Using WindowProperty<gfx::ImageSkia*> does not work either, because
gfx::ImageSkia's lifetime has expired at the time of getting.

[sky, 2016/08/09 19:12:11]

You probably want DEFINE_OWNED_WINDOW_PROPERTY_KEY. The setter than looks
something like:

window->SetProperty(kIconProperty, new ImageSkia(image));

[qiangchen, 2016/08/09 21:10:28]

Done.

+  void SetIcon(const gfx::ImageSkia& icon);
+
   bool transparent() const { return transparent_; }
   void SetTransparent(bool transparent);
 
@@ -497,6 +500,8 @@ class AURA_EXPORT Window : public ui::LayerDelegate,
 
   base::string16 title_;
 
+  gfx::ImageSkia icon_;
+
   // Whether layer is initialized as non-opaque.
   bool transparent_;