Add ENABLE_PRINTING and disable it on Android.

chrome/chrome_browser.gypi

Index: chrome/chrome_browser.gypi
diff --git a/chrome/chrome_browser.gypi b/chrome/chrome_browser.gypi
index d86e0cc14555ce096761dbcfa68aa54e2cb9ecfa..dc03dd56c794455eecb99877f65d65d0b672a830 100644
--- a/chrome/chrome_browser.gypi
+++ b/chrome/chrome_browser.gypi
@@ -4633,6 +4633,12 @@
             ['exclude', '^browser/automation/'],
           ],
         }],
+        ['enable_printing!=1', {
+          'sources/': [
+            ['exclude', '^browser/printing/'],
+            ['exclude', '^browser/ui/webui/print_preview/'],
+          ],
+        }],
         ['enable_session_service!=1', {
           'sources!': [
             'browser/sessions/session_restore.cc',
@@ -4694,7 +4700,6 @@
             ['exclude', '^browser/captive_portal/'],
             ['exclude', '^browser/chrome_to_mobile'],
             ['exclude', '^browser/importer/'],
-            ['exclude', '^browser/printing/'],
             ['exclude', '^browser/ui/panels/'],
             ['exclude', '^browser/ui/tabs/'],
             ['exclude', '^browser/ui/toolbar/'],
@@ -4705,7 +4710,6 @@
             ['exclude', '^browser/ui/webui/inspect_'],
             ['exclude', '^browser/ui/webui/options'],
             ['exclude', '^browser/ui/webui/options2'],
-            ['exclude', '^browser/ui/webui/print_preview/'],
             ['exclude', '^browser/ui/webui/signin/'],
             ['exclude', '^browser/ui/webui/sync_promo'],
             ['exclude', '^browser/usb/'],