screenshot disabling policy

chrome/browser/ui/window_snapshot/window_snapshot_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 "chrome/browser/ui/window_snapshot/window_snapshot.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/logging.h"
 #include "base/mac/scoped_cftyperef.h"
 #include "base/memory/scoped_nsobject.h"
 #include "ui/gfx/rect.h"
 
 namespace chrome {
 
-bool GrabWindowSnapshot(gfx::NativeWindow window,
-                        std::vector<unsigned char>* png_representation,
-                        const gfx::Rect& snapshot_bounds) {
+bool GrabWindowSnapshotImpl(gfx::NativeWindow window,
+                            std::vector<unsigned char>* png_representation,
+                            const gfx::Rect& snapshot_bounds) {
   NSScreen* screen = [[NSScreen screens] objectAtIndex:0];
   gfx::Rect screen_bounds = gfx::Rect(NSRectToCGRect([screen frame]));
   gfx::Rect window_bounds = gfx::Rect(NSRectToCGRect([window frame]));
 
   // Flip window coordinates based on the primary screen.
   window_bounds.set_y(
       screen_bounds.height() - window_bounds.y() - window_bounds.height());
 
   // Convert snapshot bounds relative to window into bounds relative to
   // screen.
@@ skipping 23 matching lines @@
   if (buf == NULL || length == 0)
     return false;
 
   png_representation->assign(buf, buf + length);
   DCHECK(!png_representation->empty());
 
   return true;
 }
 
 }  // namespace chrome