Add ErrorPageTestCase to external url test suite.

ios/chrome/browser/ui/BUILD.gn

Index: ios/chrome/browser/ui/BUILD.gn
diff --git a/ios/chrome/browser/ui/BUILD.gn b/ios/chrome/browser/ui/BUILD.gn
index 34024c6a2452d58409a20024749248ec14724f40..06b911811a6025d84d3b71ed2585177993f06f8f 100644
--- a/ios/chrome/browser/ui/BUILD.gn
+++ b/ios/chrome/browser/ui/BUILD.gn
@@ -496,12 +496,30 @@ bundle_data("resources_unit_tests") {
   ]
 }
 
+# These tests use external URLs and hit network.  They will fail if the network
+# is unavailable. Reference to crbug.com/694662.
+source_set("external_url_eg_tests") {
+  configs += [ "//build/config/compiler:enable_arc" ]
+  testonly = true
+  sources = [
+    "error_page_egtest.mm",

[Eugene But (OOO till 7-30), 2017/04/20 22:50:36]

External URL tests have external_url_ prefix and live in
ios_internal/chrome/test/external_url directory. Is there a reason why error
page test should be different?

[huangml1, 2017/04/21 00:03:02]

No specific reason.  I moved these tests here since this external url suite
already exists upstream.  I guess we want to keep them run upstream?

+  ]
+  deps = [
+    "//components/strings",
+    "//ios/chrome/test/app:test_support",
+    "//ios/chrome/test/earl_grey:test_support",
+    "//ios/web:earl_grey_test_support",
+    "//ios/web:test_support",
+    "//ui/base",
+  ]
+  libs = [ "XCTest.framework" ]
+}
+
 source_set("eg_tests") {
   configs += [ "//build/config/compiler:enable_arc" ]
   testonly = true
   sources = [
     "browser_view_controller_egtest.mm",
-    "error_page_egtest.mm",
     "fullscreen_egtest.mm",
     "keyboard_commands_egtest.mm",
   ]