Added probe to determine if data reduction proxy can be used

build/common.gypi

 # 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.
 
 # 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.
@@ skipping 424 matching lines @@
 
       # Platform natively supports discardable memory.
       'native_discardable_memory%': 0,
 
       # Platform sends memory pressure signals natively.
       'native_memory_pressure_signals%': 0,
 
       'spdy_proxy_auth_origin%' : '',
       'spdy_proxy_auth_property%' : '',
       'spdy_proxy_auth_value%' : '',
+      'data_reduction_proxy_probe_url%' : '',
       'enable_mdns%' : 0,
 
       'conditions': [
         # A flag for POSIX platforms
         ['OS=="win"', {
           'os_posix%': 0,
         }, {
           'os_posix%': 1,
         }],
 
@@ skipping 434 matching lines @@
     'enable_settings_app%': '<(enable_settings_app)',
     'google_api_key%': '<(google_api_key)',
     'google_default_client_id%': '<(google_default_client_id)',
     'google_default_client_secret%': '<(google_default_client_secret)',
     'enable_managed_users%': '<(enable_managed_users)',
     'native_discardable_memory%': '<(native_discardable_memory)',
     'native_memory_pressure_signals%': '<(native_memory_pressure_signals)',
     'spdy_proxy_auth_origin%': '<(spdy_proxy_auth_origin)',
     'spdy_proxy_auth_property%': '<(spdy_proxy_auth_property)',
     'spdy_proxy_auth_value%': '<(spdy_proxy_auth_value)',
+    'data_reduction_proxy_probe_url%': '<(data_reduction_proxy_probe_url)',
     'enable_mdns%' : '<(enable_mdns)',
     'v8_optimized_debug': '<(v8_optimized_debug)',
     'proprietary_codecs%': '<(proprietary_codecs)',
 
     # Use system nspr instead of the bundled one.
     'use_system_nspr%': 0,
 
     # Use system protobuf instead of bundled one.
     'use_system_protobuf%': 0,
 
@@ skipping 1424 matching lines @@
       }],
       ['spdy_proxy_auth_origin != ""', {
         'defines': ['SPDY_PROXY_AUTH_ORIGIN="<(spdy_proxy_auth_origin)"'],
       }],
       ['spdy_proxy_auth_property != ""', {
         'defines': ['SPDY_PROXY_AUTH_PROPERTY="<(spdy_proxy_auth_property)"'],
       }],
       ['spdy_proxy_auth_value != ""', {
         'defines': ['SPDY_PROXY_AUTH_VALUE="<(spdy_proxy_auth_value)"'],
       }],
+      ['data_reduction_proxy_probe_url != ""', {
+        'defines': [
+          'DATA_REDUCTION_PROXY_PROBE_URL="<(data_reduction_proxy_probe_url)"'],
+      }],
       ['enable_mdns==1', {
         'defines': ['ENABLE_MDNS=1'],
       }]
     ],  # conditions for 'target_defaults'
     'target_conditions': [
       ['enable_wexit_time_destructors==1', {
         'conditions': [
           [ 'clang==1', {
             'cflags': [
               '-Wexit-time-destructors',
@@ skipping 2392 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',
   },
 }