Write mojom and EnumTraits for display::HDCPState.

ui/display/mojo/display_struct_traits_unittest.cc

 // 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.
 
 #include <memory>
 
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "mojo/public/cpp/bindings/binding_set.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 46 matching lines @@
       const DisplayPlacement& in,
       const EchoDisplayPlacementCallback& callback) override {
     callback.Run(in);
   }
 
   void EchoDisplayLayout(std::unique_ptr<display::DisplayLayout> in,
                          const EchoDisplayLayoutCallback& callback) override {
     callback.Run(std::move(in));
   }
 
+  void EchoHDCPState(display::HDCPState in,
+                     const EchoHDCPStateCallback& callback) override {
+    callback.Run(in);
+  }
+
   void EchoGammaRampRGBEntry(
       const GammaRampRGBEntry& in,
       const EchoGammaRampRGBEntryCallback& callback) override {
     callback.Run(in);
   }
 
   base::MessageLoop loop_;  // A MessageLoop is needed for Mojo IPC to work.
   mojo::BindingSet<mojom::DisplayStructTraitsTest> traits_test_bindings_;
 
   DISALLOW_COPY_AND_ASSIGN(DisplayStructTraitsTest);
@@ skipping 359 matching lines @@
           has_overscan, has_color_correction_matrix, display_name, sys_path,
           product_id, std::move(modes), edid, current_mode, native_mode,
           maximum_cursor_size);
 
   std::unique_ptr<DisplaySnapshotMojo> output;
   GetTraitsTestProxy()->EchoDisplaySnapshotMojo(input->Clone(), &output);
 
   CheckDisplaySnapShotMojoEqual(*input, *output);
 }
 
+TEST_F(DisplayStructTraitsTest, HDCPStateBasic) {
+  const display::HDCPState input(HDCP_STATE_ENABLED);
+  display::HDCPState output;
+  GetTraitsTestProxy()->EchoHDCPState(input, &output);
+  EXPECT_EQ(input, output);
+}
+
 }  // namespace display