Replicate to all renderers the accepted languages set by a layout test.

components/test_runner/layout_test_runtime_flags.h

 // Copyright 2016 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.
 
 #ifndef COMPONENTS_TEST_RUNNER_LAYOUT_TEST_RUNTIME_FLAGS_H_
 #define COMPONENTS_TEST_RUNNER_LAYOUT_TEST_RUNTIME_FLAGS_H_
 
 #include <string>
 
 #include "base/logging.h"
@@ skipping 20 matching lines @@
 
 #define DEFINE_BOOL_LAYOUT_TEST_RUNTIME_FLAG(name)                  \
   bool name() const {                                               \
     bool result;                                                    \
     bool found = dict_.current_values().GetBoolean(#name, &result); \
     DCHECK(found);                                                  \
     return result;                                                  \
   }                                                                 \
   void set_##name(bool new_value) { dict_.SetBoolean(#name, new_value); }
 
+#define DEFINE_STRING_LAYOUT_TEST_RUNTIME_FLAG(name)               \
+  std::string name() const {                                       \
+    std::string result;                                            \
+    bool found = dict_.current_values().GetString(#name, &result); \
+    DCHECK(found);                                                 \
+    return result;                                                 \
+  }                                                                \
+  void set_##name(const std::string& new_value) {                  \
+    dict_.SetString(#name, new_value);                             \
+  }
+
   // If true, the test_shell will generate pixel results in DumpAsText mode.
   DEFINE_BOOL_LAYOUT_TEST_RUNTIME_FLAG(generate_pixel_results)
 
   // If true, the test_shell will produce a plain text dump rather than a
   // text representation of the renderer.
   DEFINE_BOOL_LAYOUT_TEST_RUNTIME_FLAG(dump_as_text)
 
   // If true and if dump_as_text_ is true, the test_shell will recursively
   // dump all frames as plain text.
   DEFINE_BOOL_LAYOUT_TEST_RUNTIME_FLAG(dump_child_frames_as_text)
@@ skipping 22 matching lines @@
   // don't actually want to open the mail program.
   DEFINE_BOOL_LAYOUT_TEST_RUNTIME_FLAG(policy_delegate_enabled)
 
   // Toggles the behavior of the policy delegate. If true, then navigations
   // will be allowed. Otherwise, they will be ignored (dropped).
   DEFINE_BOOL_LAYOUT_TEST_RUNTIME_FLAG(policy_delegate_is_permissive)
 
   // If true, the policy delegate will signal layout test completion.
   DEFINE_BOOL_LAYOUT_TEST_RUNTIME_FLAG(policy_delegate_should_notify_done)
 
+  // Contents of Accept-Language HTTP header requested by the test.
+  DEFINE_STRING_LAYOUT_TEST_RUNTIME_FLAG(accept_languages)
+
 #undef DEFINE_BOOL_LAYOUT_TEST_RUNTIME_FLAG
+#undef DEFINE_STRING_LAYOUT_TEST_RUNTIME_FLAG
 
   // Reports whether recursing over child frames is necessary.
   bool dump_child_frames() const {
     if (dump_as_text())
       return dump_child_frames_as_text();
     else if (dump_as_markup())
       return dump_child_frames_as_markup();
     else
       return dump_child_frame_scroll_positions();
   }
 
  private:
   TrackedDictionary dict_;
 
   DISALLOW_COPY_AND_ASSIGN(LayoutTestRuntimeFlags);
 };
 
 }  // namespace test_runner
 
 #endif  // COMPONENTS_TEST_RUNNER_LAYOUT_TEST_RUNTIME_FLAGS_H_