Introduce XGetImage() for GrabWindowSnapshot() in ChromeOS.

ui/aura/root_window_host_mac.mm

 // Copyright (c) 2012 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.
 
 #include "ui/aura/root_window_host_mac.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/compiler_specific.h"
 #include "base/mac/bundle_locations.h"
@@ skipping 27 matching lines @@
   virtual void SetSize(const gfx::Size& size) OVERRIDE;
   virtual gfx::Point GetLocationOnNativeScreen() const OVERRIDE;
   virtual void SetCapture() OVERRIDE;
   virtual void ReleaseCapture() OVERRIDE;
   virtual void SetCursor(gfx::NativeCursor cursor) OVERRIDE;
   virtual void ShowCursor(bool show) OVERRIDE;
   virtual gfx::Point QueryMouseLocation() OVERRIDE;
   virtual void MoveCursorTo(const gfx::Point& location) OVERRIDE;
   virtual bool ConfineCursorToRootWindow() OVERRIDE;
   virtual void UnConfineCursor() OVERRIDE;
+  virtual bool GrabSnapshot(
+      const gfx::Rect& snapshot_bounds,
+      std::vector<unsigned char>* png_representation) OVERRIDE;
 
   // RootWindowHostMacDelegate:
   virtual void SendEvent(const base::NativeEvent& native_event) OVERRIDE;
 
   // Set the initial location of the root window.  The origin of |bounds| is
   // top-left.  This gets converted to bottom-left to match Mac coordinates on
   // the main screen.
   void SetLocation(const gfx::Rect& bounds);
 
  private:
@@ skipping 104 matching lines @@
 void RootWindowHostMac::MoveCursorTo(const gfx::Point& location) {
 }
 
 bool RootWindowHostMac::ConfineCursorToRootWindow() {
   return false;
 }
 
 void RootWindowHostMac::UnConfineCursor() {
 }
 
+bool RootWindowHostMac::GrabSnapshot(
+    const gfx::Rect& snapshot_bounds,
+    std::vector<unsigned char>* png_representation) {
+  NOTIMPLEMENTED();
+  return false;
+}
+
 void RootWindowHostMac::SendEvent(const base::NativeEvent& native_event) {
   ui::EventType type = ui::EventTypeFromNative(native_event);
   switch (type) {
     case ui::ET_MOUSE_PRESSED:
     case ui::ET_MOUSE_DRAGGED:
     case ui::ET_MOUSE_RELEASED:
     case ui::ET_MOUSE_MOVED:
     case ui::ET_MOUSE_ENTERED:
     case ui::ET_MOUSE_EXITED: {
       MouseEvent mouse_event(native_event);
@@ skipping 23 matching lines @@
 
 void RootWindowHostMac::SetLocation(const gfx::Rect& bounds) {
   NSRect screen = [[NSScreen mainScreen] visibleFrame];
   NSPoint origin = NSMakePoint(screen.origin.x + bounds.x(),
                                screen.origin.y + screen.size.height -
                                    bounds.y() - bounds.height());
   [[controller_ window] setFrameOrigin:origin];
 }
 
 }  // namespace aura