Create mojom and StructTraits for ui/display/types/display_mode.cc

ui/ozone/common/mojo/display_mode_proxy_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 "base/logging.h"
+#include "base/message_loop/message_loop.h"
+#include "mojo/public/cpp/bindings/binding.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "ui/ozone/common/mojo/display_mode_proxy_test.mojom.h"

[kylechar, 2017/01/17 17:19:27]

Missing #include for ui::DisplayMode_Params.

[thanhph1, 2017/01/17 20:19:06]

Done.

+
+namespace ui {
+
+class DisplayModeProxyTestImpl : public mojom::DisplayModeProxyTest {

[kylechar, 2017/01/17 17:19:27]

You'll want to put the DisplaySnapshotParams test in here too. So I would
recommend you change the name of the test class and test interface to something
more general.

[thanhph1, 2017/01/17 20:19:06]

Done.

+ public:
+  explicit DisplayModeProxyTestImpl(
+      mojo::InterfaceRequest<mojom::DisplayModeProxyTest> request)
+      : binding_(this, std::move(request)) {}
+
+  // DisplayModeProxyTest:
+  void BounceDisplayModeProxy(
+      const DisplayMode_Params& input,
+      const BounceDisplayModeProxyCallback& callback) override {
+    callback.Run(input);
+  }
+
+ private:
+  mojo::Binding<DisplayModeProxyTest> binding_;
+
+  DISALLOW_COPY_AND_ASSIGN(DisplayModeProxyTestImpl);
+};
+
+TEST(MojoDisplayModeStructTraitsTest, Basic) {
+  // A MessageLoop is needed for Mojo IPC to work.
+  base::MessageLoop message_loop;
+
+  mojom::DisplayModeProxyTestPtr proxy;
+  DisplayModeProxyTestImpl impl(MakeRequest(&proxy));
+
+  // sample random data
+  gfx::Size size(15, 29);

[kylechar, 2017/01/17 17:19:27]

If you aren't going to use these again, there is no point in defining the
variables instead of just setting input directly. If you are going to compare
against them, make them const.

[thanhph1, 2017/01/17 20:19:06]

Done.

+  bool is_interlaced = true;
+  float refresh_rate = 61;
+
+  // prepare input values
+  DisplayMode_Params input;
+  input.size = size;
+  input.is_interlaced = is_interlaced;
+  input.refresh_rate = refresh_rate;
+  ui::DisplayMode_Params output;
+
+  EXPECT_TRUE(proxy->BounceDisplayModeProxy(input, &output));
+
+  // We want to test each component individually to make sure each data member
+  // was correctly serialized and deserialized.
+  EXPECT_NE(&input, &output);  // Make sure they aren't the same object.

[kylechar, 2017/01/17 17:19:27]

You know what input and output aren't the same object here, since they are both
defined in this function. If this was a separate function where both input and
output were passed in that would be different.

[thanhph1, 2017/01/17 20:19:06]

Done, thanks!

+  EXPECT_EQ(input.size.width(), output.size.width());

[kylechar, 2017/01/17 17:19:27]

gfx::Size has == defined, so you can compare them directly.

[thanhph1, 2017/01/17 20:19:06]

Done.

+  EXPECT_EQ(input.size.height(), output.size.height());
+  EXPECT_EQ(input.is_interlaced, output.is_interlaced);
+  EXPECT_EQ(input.refresh_rate, output.refresh_rate);
+}
+
+}  // namespace ui