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// 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/extensions/extension_webkit_preferences.h"
#include "base/command_line.h"
#include "chrome/common/chrome_switches.h"
#include "chrome/common/extensions/extension.h"
#include "webkit/glue/webpreferences.h"
namespace extension_webkit_preferences {
void SetPreferences(const Extension* extension,
content::ViewType render_view_type,
WebPreferences* webkit_prefs) {
if (!extension)
return;
if (!extension->is_hosted_app()) {
// Extensions are trusted so we override any user preferences for disabling
// javascript or images.
webkit_prefs->loads_images_automatically = true;
webkit_prefs->javascript_enabled = true;
// Tabs aren't typically allowed to close windows. But extensions shouldn't
// be subject to that.
webkit_prefs->allow_scripts_to_close_windows = true;
}
if (extension->is_platform_app()) {
webkit_prefs->databases_enabled = false;
webkit_prefs->local_storage_enabled = false;
}
// Enable WebGL features that regular pages can't access, since they add
// more risk of fingerprinting.
webkit_prefs->privileged_webgl_extensions_enabled = true;
// If this is a component extension, then apply the same poliy for
// accelerated compositing as for chrome: URLs (from
// TabContents::GetWebkitPrefs). This is important for component extensions
// like the file manager which are sometimes loaded using chrome: URLs and
// sometimes loaded with chrome-extension: URLs - we should expect the
// performance characteristics to be similar in both cases.
const CommandLine& command_line = *CommandLine::ForCurrentProcess();
if (extension->location() == Extension::COMPONENT &&
!command_line.HasSwitch(switches::kAllowWebUICompositing)) {
webkit_prefs->accelerated_compositing_enabled = false;
webkit_prefs->accelerated_2d_canvas_enabled = false;
}
}
} // extension_webkit_preferences
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