Reenable fastbuild (for windows only)....

build/common.gypi

 # 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   'variables': {
     # .gyp files should set chromium_code to 1 if they build Chromium-specific
@@ skipping 39 matching lines @@
       # ~/.gyp/include.gypi .
       'toolkit_views%': 0,
 
       # Defaults to a desktop build, overridden via command line/env.
       'chromeos%': 0,
 
       # 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 disabled debug info for fastest
+      # compilation.
+      'fastbuild%': 0,
     },
 
     # Define branding and buildtype on the basis of their settings within the
     # variables sub-dict above, unless overridden.
     'branding%': '<(branding)',
     'buildtype%': '<(buildtype)',
     'target_arch%': '<(target_arch)',
     'toolkit_views%': '<(toolkit_views)',
     'chromeos%': '<(chromeos)',
     'inside_chromium_build%': '<(inside_chromium_build)',
+    'fastbuild%': '<(fastbuild)',
 
     # Override chromium_mac_pch and set it to 0 to suppress the use of
     # precompiled headers on the Mac.  Prefix header injection may still be
     # used, but prefix headers will not be precompiled.  This is useful when
     # using distcc to distribute a build to compile slaves that don't
     # share the same compiler executable as the system driving the compilation,
     # because precompiled headers rely on pointers into a specific compiler
     # executable's image.  Setting this to 0 is needed to use an experimental
     # Linux-Mac cross compiler distcc farm.
     'chromium_mac_pch%': 1,
@@ skipping 173 matching lines @@
       }],
       ['chrome_frame_define', {
         'defines': ['CHROME_FRAME_BUILD'],
       }],
       ['toolkit_views==1', {
         'defines': ['TOOLKIT_VIEWS=1'],
       }],
       ['chromeos==1', {
         'defines': ['OS_CHROMEOS=1'],
       }],
+      ['fastbuild!=0', {
+        'conditions': [
+          # Finally, for Windows, we simply turn on profiling.
+          ['OS=="win"', {
+            'msvs_settings': {
+              'VCLinkerTool': {
+                'GenerateDebugInformation': 'false',
+              },
+              'VCCLCompilerTool': {
+                'DebugInformationFormat': '0',
+              }
+            }
+         }],  # OS==win
+        ],  # conditions for fastbuild.
+      }],  # fastbuild!=0
       ['selinux==1', {
         'defines': ['CHROMIUM_SELINUX=1'],
       }],
       ['coverage!=0', {
         'conditions': [
           ['OS=="mac"', {
             'xcode_settings': {
               'GCC_INSTRUMENT_PROGRAM_FLOW_ARCS': 'YES',  # -fprofile-arcs
               'GCC_GENERATE_TEST_COVERAGE_FILES': 'YES',  # -ftest-coverage
             },
@@ skipping 602 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }