Implement BackgroundFetchManager.fetch() and struct traits

content/common/background_fetch/background_fetch_struct_traits_unittest.cc

+// Copyright 2017 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 "content/common/background_fetch/background_fetch_struct_traits.h"
+
+#include "content/common/background_fetch/background_fetch_types.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace content {
+
+namespace {
+
+// Creates a new IconDefinition object for the given arguments.
+IconDefinition CreateIconDefinition(std::string src,

[dcheng, 2017/03/21 07:03:20]

FWIW, it's still more common to pass by ref and just copy. While it can be more
efficient, there's a binary size tradeoff: since the arguments are passed by
value, the compiler often has to emit code to clean up the temporaries (even if
the value is moved out).

[Peter Beverloo, 2017/03/21 13:46:27]

That's good to know, thanks. I'll look at some disassembly later in the week to
grow a better understanding of this.

The arguments given to this function are string literals, so we end up creating
the temporaries anyway. I've left this call as-is for that reason.

+                                    std::string sizes,
+                                    std::string type) {
+  IconDefinition definition;
+  definition.src = std::move(src);

[dcheng, 2017/03/21 07:03:20]

Nit: #include <utility>

[Peter Beverloo, 2017/03/21 13:46:27]

Done.

+  definition.sizes = std::move(sizes);
+  definition.type = std::move(type);
+
+  return definition;
+}
+
+// Returns whether the given IconDefinition objects are identical.
+bool IconDefinitionsAreIdentical(const IconDefinition& left,
+                                 const IconDefinition& right) {
+  return left.src == right.src && left.sizes == right.sizes &&
+         left.type == right.type;
+}
+
+}  // namespace
+
+TEST(BackgroundFetchStructTraitsTest, BackgroundFetchOptionsRoundtrip) {
+  BackgroundFetchOptions options;
+  options.icons = {
+      CreateIconDefinition("my_icon.png", "256x256", "image/png"),
+      CreateIconDefinition("my_small_icon.jpg", "128x128", "image/jpg")};
+  options.title = "My Background Fetch";
+  options.total_download_size = 9001;
+
+  BackgroundFetchOptions roundtrip_options;
+  ASSERT_TRUE(blink::mojom::BackgroundFetchOptions::Deserialize(
+      blink::mojom::BackgroundFetchOptions::Serialize(&options),
+      &roundtrip_options));
+
+  ASSERT_EQ(roundtrip_options.icons.size(), options.icons.size());
+  for (size_t i = 0; i < options.icons.size(); ++i) {
+    EXPECT_TRUE(IconDefinitionsAreIdentical(options.icons[i],
+                                            roundtrip_options.icons[i]));
+  }
+
+  EXPECT_EQ(roundtrip_options.title, options.title);
+  EXPECT_EQ(roundtrip_options.total_download_size, options.total_download_size);
+}
+
+TEST(BackgroundFetchStructTraitsTest, BackgroundFetchRegistrationRoundTrip) {
+  BackgroundFetchRegistration registration;
+  registration.tag = "my_tag";
+  registration.icons = {
+      CreateIconDefinition("my_icon.png", "256x256", "image/png"),
+      CreateIconDefinition("my_small_icon.jpg", "128x128", "image/jpg")};
+  registration.title = "My Background Fetch";
+  registration.total_download_size = 9001;
+
+  BackgroundFetchRegistration roundtrip_registration;
+  ASSERT_TRUE(blink::mojom::BackgroundFetchRegistration::Deserialize(
+      blink::mojom::BackgroundFetchRegistration::Serialize(&registration),
+      &roundtrip_registration));
+
+  EXPECT_EQ(roundtrip_registration.tag, registration.tag);
+
+  ASSERT_EQ(roundtrip_registration.icons.size(), registration.icons.size());
+  for (size_t i = 0; i < registration.icons.size(); ++i) {
+    EXPECT_TRUE(IconDefinitionsAreIdentical(registration.icons[i],
+                                            roundtrip_registration.icons[i]));
+  }
+
+  EXPECT_EQ(roundtrip_registration.title, registration.title);
+  EXPECT_EQ(roundtrip_registration.total_download_size,
+            registration.total_download_size);
+}
+
+TEST(BackgroundFetchStructTraitsTest, IconDefinitionRoundtrip) {
+  IconDefinition definition =
+      CreateIconDefinition("my_icon.png", "256x256", "image/png");
+
+  IconDefinition roundtrip_definition;
+  ASSERT_TRUE(blink::mojom::IconDefinition::Deserialize(
+      blink::mojom::IconDefinition::Serialize(&definition),
+      &roundtrip_definition));
+
+  EXPECT_TRUE(IconDefinitionsAreIdentical(definition, roundtrip_definition));
+}
+
+}  // namespace content