Refactor GrabWindowSnapshot and GrabWindowSnapshotImpl names to GrabWindowSnapshotForUser and GrabW…

chrome/browser/ui/window_snapshot/window_snapshot.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_WINDOW_SNAPSHOT_WINDOW_SNAPSHOT_H_
 #define CHROME_BROWSER_UI_WINDOW_SNAPSHOT_WINDOW_SNAPSHOT_H_
 
 #include <vector>
 
 #include "ui/gfx/native_widget_types.h"
 
 class PrefService;
 
 namespace gfx {
 class Rect;
 }
 
 namespace chrome {
 
+void RegisterScreenshotPrefs(PrefService* service);
+
 // Grabs a snapshot of the rectangle area |snapshot_bounds| with respect to the
 // top left corner of the designated window and stores a PNG representation
 // into a byte vector. On Windows, |window| may be NULL to grab a snapshot of
-// the primary monitor. Returns true if the operation is successful.
+// the primary monitor. This takes into account calling user context (ie. checks
+// policy settings if taking screenshots is allowed), and is intended to be used
+// by browser code. If you need to take a screenshot for debugging purposes,
+// consider using GrabWindowSnapshot.
+// Returns true if the operation is successful (ie. permitted).
+bool GrabWindowSnapshotForUser(
+    gfx::NativeWindow window,
+    std::vector<unsigned char>* png_representation,
+    const gfx::Rect& snapshot_bounds);
+
+namespace internal {
+
+// Like GrabWindowSnapshotForUser, but does not perform additional security
+// checks - just grabs a snapshot. This is intended to be used for debugging
+// purposes where no BrowserProcess instance is available (ie. tests).
+// DO NOT use in a result of user action.
 bool GrabWindowSnapshot(
     gfx::NativeWindow window,
     std::vector<unsigned char>* png_representation,
     const gfx::Rect& snapshot_bounds);
 
-void RegisterScreenshotPrefs(PrefService* service);
-
+}  // namespace internal
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_UI_WINDOW_SNAPSHOT_WINDOW_SNAPSHOT_H_