blob: 3413442671effa4f3081f0aefaa705dcadc7d7b4 [file] [log] [blame]
// 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 "chrome/common/extensions/manifest.h"
#include "webkit/glue/webpreferences.h"
namespace extension_webkit_preferences {
void SetPreferences(const extensions::Extension* extension,
chrome::ViewType render_view_type,
webkit_glue::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;
// Disable all gpu features for extension background pages, to reduce
// memory impact of extensions. See crbug.com/123935. This also "works
// around" crbug.com/123935
if (render_view_type == chrome::VIEW_TYPE_EXTENSION_BACKGROUND_PAGE) {
webkit_prefs->accelerated_compositing_enabled = false;
}
}
if (extension->is_platform_app()) {
webkit_prefs->databases_enabled = false;
webkit_prefs->local_storage_enabled = false;
webkit_prefs->sync_xhr_in_documents_enabled = false;
webkit_prefs->cookie_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
// WebContents::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() == extensions::Manifest::COMPONENT &&
!command_line.HasSwitch(switches::kAllowWebUICompositing)) {
webkit_prefs->accelerated_compositing_enabled = false;
webkit_prefs->accelerated_2d_canvas_enabled = false;
}
}
} // extension_webkit_preferences