GTK: Add a dialog for printing.

Add an infobar directing users to tell us if they have problems with printing.

Hide printing behind --enable-printing flag on linux/gtk.

BUG=9847
TEST=none
Review URL: http://codereview.chromium.org/200138

git-svn-id: http://src.chromium.org/svn/trunk/src/build@26400 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

linux/system.gyp

@@ -33,6 +33,23 @@
         ],
       },
     },
+    {
+      'target_name': 'gtkprint',
+      'type': 'settings',
+      'direct_dependent_settings': {
+        'cflags': [
+          '<!@(<(pkg-config) --cflags gtk+-unix-print-2.0)',
+        ],
+      },
+      'link_settings': {
+        'ldflags': [
+          '<!@(<(pkg-config) --libs-only-L --libs-only-other gtk+-unix-print-2.0)',
+        ],
+        'libraries': [
+          '<!@(<(pkg-config) --libs-only-l gtk+-unix-print-2.0)',
+        ],
+      },
+    },
     {
       'target_name': 'nss',
       'type': 'settings',