1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "chrome/browser/extensions/extension_webkit_preferences.h" 6 7 #include "base/command_line.h" 8 #include "chrome/common/chrome_switches.h" 9 #include "chrome/common/extensions/extension.h" 10 #include "chrome/common/extensions/manifest.h" 11 #include "webkit/common/webpreferences.h" 12 13 namespace extension_webkit_preferences { 14 15 void SetPreferences(const extensions::Extension* extension, 16 extensions::ViewType render_view_type, 17 WebPreferences* webkit_prefs) { 18 if (!extension) 19 return; 20 21 if (!extension->is_hosted_app()) { 22 // Extensions are trusted so we override any user preferences for disabling 23 // javascript or images. 24 webkit_prefs->loads_images_automatically = true; 25 webkit_prefs->javascript_enabled = true; 26 27 // Tabs aren't typically allowed to close windows. But extensions shouldn't 28 // be subject to that. 29 webkit_prefs->allow_scripts_to_close_windows = true; 30 31 // Disable gpu acceleration for extension background pages to avoid 32 // unecessarily creating a compositor context for them. 33 if (render_view_type == extensions::VIEW_TYPE_EXTENSION_BACKGROUND_PAGE) { 34 webkit_prefs->accelerated_compositing_enabled = false; 35 webkit_prefs->force_compositing_mode = false; 36 } 37 } 38 39 if (extension->is_platform_app()) { 40 webkit_prefs->databases_enabled = false; 41 webkit_prefs->local_storage_enabled = false; 42 webkit_prefs->sync_xhr_in_documents_enabled = false; 43 webkit_prefs->cookie_enabled = false; 44 } 45 46 // Enable WebGL features that regular pages can't access, since they add 47 // more risk of fingerprinting. 48 webkit_prefs->privileged_webgl_extensions_enabled = true; 49 50 // If this is a component extension, then apply the same poliy for 51 // accelerated compositing as for chrome: URLs (from 52 // WebContents::GetWebkitPrefs). This is important for component extensions 53 // like the file manager which are sometimes loaded using chrome: URLs and 54 // sometimes loaded with chrome-extension: URLs - we should expect the 55 // performance characteristics to be similar in both cases. 56 const CommandLine& command_line = *CommandLine::ForCurrentProcess(); 57 if (extension->location() == extensions::Manifest::COMPONENT && 58 !command_line.HasSwitch(switches::kAllowWebUICompositing)) { 59 webkit_prefs->accelerated_compositing_enabled = false; 60 webkit_prefs->accelerated_2d_canvas_enabled = false; 61 } 62 } 63 64 } // extension_webkit_preferences 65
