Introduce XGetImage() for GrabWindowSnapshot() in ChromeOS.

ui/aura/root_window.h

Index: ui/aura/root_window.h
diff --git a/ui/aura/root_window.h b/ui/aura/root_window.h
index 708fa6cefbfee9b5889dec3e30397806b0f97e5f..50bec16ae828fdba130e516359ba0aca99248c6c 100644
--- a/ui/aura/root_window.h
+++ b/ui/aura/root_window.h
@@ -6,6 +6,8 @@
 #define UI_AURA_ROOT_WINDOW_H_
 #pragma once
 
+#include <vector>
+
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
@@ -248,6 +250,9 @@ class AURA_EXPORT RootWindow : public ui::CompositorDelegate,
   // Sets if the window should be focused when shown.
   void SetFocusWhenShown(bool focus_when_shown);
 
+  bool GrabWindowSnapshot(std::vector<unsigned char>* png_representation,

[Daniel Erat, 2012/05/14 23:17:40]

nit: Add a comment describing what this does.

Should you drop "Window" from the method name?  Is there anything specific to a
particular window here, or can the snapshot span multiple windows?

[Jun Mukai, 2012/05/15 22:39:24]

Done.

+                          const gfx::Rect& snapshot_bounds);
+
   // Overridden from Window:
   virtual RootWindow* GetRootWindow() OVERRIDE;
   virtual const RootWindow* GetRootWindow() const OVERRIDE;