Open a login tab on captive portal detection on SSL loads.

build/common.gypi

Index: build/common.gypi
===================================================================
--- build/common.gypi	(revision 139574)
+++ build/common.gypi	(working copy)
@@ -492,6 +492,12 @@
           'enable_automation%': 1,
         }],
 
+        ['OS=="android"', {
+          'enable_captive_portal_detection%': 0,
+        }, {
+          'enable_captive_portal_detection%': 1,
+        }],
+
         # Enable Skia UI text drawing incrementally on different platforms.
         # http://crbug.com/105550
         #
@@ -573,6 +579,7 @@
     'test_isolation_mode%': '<(test_isolation_mode)',
     'test_isolation_outdir%': '<(test_isolation_outdir)',
     'enable_automation%': '<(enable_automation)',
+    'enable_captive_portal_detection%': '<(enable_captive_portal_detection)',
     'force_rlz_use_chrome_net%': '<(force_rlz_use_chrome_net)',
     'enable_task_manager%': '<(enable_task_manager)',
     'platformsdk_path%': '<(platformsdk_path)',
@@ -1527,6 +1534,9 @@
       ['enable_automation==1', {
         'defines': ['ENABLE_AUTOMATION=1'],
       }],
+      ['enable_captive_portal_detection==1', {
+        'defines': ['ENABLE_CAPTIVE_PORTAL_DETECTION=1'],
+      }],
     ],  # conditions for 'target_defaults'
     'target_conditions': [
       ['enable_wexit_time_destructors==1', {