Linux: implement Page Actions support.

chrome/chrome.gyp

 # Copyright (c) 2009 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.
 
 {
   'variables': {
     'chromium_code': 1,
 
     # Define the common dependencies that contain all the actual
     # Chromium functionality.  This list gets pulled in below by
@@ skipping 1428 matching lines @@
         'browser/icon_loader.h',
         'browser/icon_loader.cc',
         'browser/icon_loader_linux.cc',
         'browser/icon_loader_mac.mm',
         'browser/icon_loader_win.cc',
         'browser/icon_manager.cc',
         'browser/icon_manager.h',
         'browser/icon_manager_linux.cc',
         'browser/icon_manager_mac.mm',
         'browser/icon_manager_win.cc',
+        'browser/image_loading_tracker.cc',
+        'browser/image_loading_tracker.h',
         'browser/ime_input.cc',
         'browser/ime_input.h',
         'browser/importer/firefox2_importer.cc',
         'browser/importer/firefox2_importer.h',
         'browser/importer/firefox3_importer.cc',
         'browser/importer/firefox3_importer.h',
         'browser/importer/firefox_importer_utils.cc',
         'browser/importer/firefox_importer_utils_linux.cc',
         'browser/importer/firefox_importer_utils_mac.mm',
         'browser/importer/firefox_importer_utils_win.cc',
@@ skipping 4620 matching lines @@
               # Use outputs of this action as inputs for the main target build.
               # Seems as a misnomer but makes this happy on Linux (scons).
               'process_outputs_as_sources': 1,
             },
           ],  # 'actions'
         },
       ]
     }],
   ],  # 'conditions'
 }