Made full tab file browser to open automatically when a new disk device is properly mounted.

build/common.gypi

 # Copyright (c) 2010 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
   'variables': {
     # Putting a variables dict inside another variables dict looks kind of
     # weird.  This is done so that 'host_arch', 'chromeos', etc are defined as
     # variables within the outer variables dict here.  This is necessary
     # to get these variables defined for the conditions within this variables
     # dict that operate on these variables (e.g., for setting 'toolkit_views',
     # we need to have 'chromeos' already set).
     'variables': {
       'variables': {
         'variables': {
           # Whether we're building a ChromeOS build.
           'chromeos%': 0,
 
           # Disable touch support by default.
           'touchui%': 0,
-
-          # Disable file manager component extension by default.
-          'file_manager_extension%': 0,
         },
         # Copy conditionally-set variables out one scope.
         'chromeos%': '<(chromeos)',
         'touchui%': '<(touchui)',
-        'file_manager_extension%': '<(file_manager_extension)',
 
         # To do a shared build on linux we need to be able to choose between
         # type static_library and shared_library. We default to doing a static
         # build but you can override this with "gyp -Dlibrary=shared_library"
         # or you can add the following line (without the #) to
         # ~/.gyp/include.gypi {'variables': {'library': 'shared_library'}}
         # to compile as shared by default
         'library%': 'static_library',
 
         # Compute the architecture that we're building on.
@@ skipping 14 matching lines @@
             'toolkit_views%': 1,
           }, {
             'toolkit_views%': 0,
           }],
         ],
       },
 
       # Copy conditionally-set variables out one scope.
       'chromeos%': '<(chromeos)',
       'touchui%': '<(touchui)',
-      'file_manager_extension%': '<(file_manager_extension)',
       'host_arch%': '<(host_arch)',
       'library%': '<(library)',
       'toolkit_views%': '<(toolkit_views)',
 
       # Override branding to select the desired branding flavor.
       'branding%': 'Chromium',
 
       # Override buildtype to select the desired build flavor.
       # Dev - everyday build for development/testing
       # Official - release build (generally implies additional processing)
@@ skipping 10 matching lines @@
 
       # This variable tells WebCore.gyp and JavaScriptCore.gyp whether they are
       # are built under a chromium full build (1) or a webkit.org chromium
       # build (0).
       'inside_chromium_build%': 1,
 
       # Set to 1 to enable fast builds. It disables debug info for fastest
       # compilation.
       'fastbuild%': 0,
 
+       # Disable file manager component extension by default.
+      'file_manager_extension%': 0,
+
       # Python version.
       'python_ver%': '2.5',
 
       # Set ARM-v7 compilation flags
       'armv7%': 0,
 
       # Set Neon compilation flags (only meaningful if armv7==1).
       'arm_neon%': 1,
 
       # The system root for cross-compiles. Default: none.
@@ skipping 51 matching lines @@
           # GTK+ and Mac wants Title Case strings
           'use_titlecase_in_grd_files%': 1,
         }],
 
         # Enable some hacks to support Flapper only on Chrome OS.
         ['chromeos==1', {
           'enable_flapper_hacks%': 1,
         }, {
           'enable_flapper_hacks%': 0,
         }],
+
+        # Enable file manager extension by default on Chrome OS.
+        ['chromeos==1', {
+          'file_manager_extension%': 1,
+        }, {
+          'file_manager_extension%': 0,
+        }],
       ],
     },
 
     # Copy conditionally-set variables out one scope.
     'branding%': '<(branding)',
     'buildtype%': '<(buildtype)',
     'target_arch%': '<(target_arch)',
     'host_arch%': '<(host_arch)',
     'toolkit_views%': '<(toolkit_views)',
     'use_gnome_keyring%': '<(use_gnome_keyring)',
@@ skipping 1497 matching lines @@
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }
 
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