Wrap MediaMetadata in base::Optional in content and chrome

content/browser/media/android/browser_media_session_manager_browsertest.cc

Index: content/browser/media/android/browser_media_session_manager_browsertest.cc
diff --git a/content/browser/media/android/browser_media_session_manager_browsertest.cc b/content/browser/media/android/browser_media_session_manager_browsertest.cc
index f98d73f7df0a334c91935ace43f88119ee87fd3e..370375d07dcd29f57184fa93107edb222279847e 100644
--- a/content/browser/media/android/browser_media_session_manager_browsertest.cc
+++ b/content/browser/media/android/browser_media_session_manager_browsertest.cc
@@ -30,19 +30,28 @@ namespace content {
 namespace {
 
 // Helper function for build test javascripts.
-std::string BuildSetMetadataScript(const MediaMetadata& metadata) {
+std::string BuildSetMetadataScript(
+    const base::Optional<MediaMetadata>& metadata) {
   std::ostringstream generated_script;
 
-  generated_script << "var audio = document.createElement(\'audio\');"
-     << "audio.session = new MediaSession();"
-     << "audio.session.metadata = new MediaMetadata({"
-     << "title: \"" << metadata.title << "\", "
-     << "artist: \"" << metadata.artist << "\", "
-     << "album: \"" << metadata.album << "\", "
-     << "artwork: [";
+  generated_script
+      << "var audio = document.createElement(\'audio\');"
+      << "audio.session = new MediaSession();";
+
+  if (!metadata.has_value()) {
+    generated_script << "audio.session.metadata = null;";
+    return generated_script.str();
+  }
+
+  generated_script
+      << "audio.session.metadata = new MediaMetadata({"
+      << "title: \"" << metadata->title << "\", "
+      << "artist: \"" << metadata->artist << "\", "
+      << "album: \"" << metadata->album << "\", "
+      << "artwork: [";
 
   std::string artwork_separator = "";
-  for (const auto& artwork : metadata.artwork) {
+  for (const auto& artwork : metadata->artwork) {
     generated_script << artwork_separator << "{"
        << "src: \"" << artwork.src.spec() << "\", "
        << "type: \"" << artwork.type.string() << "\", "
@@ -61,12 +70,17 @@ std::string BuildSetMetadataScript(const MediaMetadata& metadata) {
 }  // anonymous namespace
 
 // Helper function to be pretty-print error messages by GMock.
-void PrintTo(const MediaMetadata& metadata, std::ostream* os) {
-  *os << "{ title=" << metadata.title << ", ";
-  *os << "artist=" << metadata.artist << ", ";
-  *os << "album=" << metadata.album << ", ";
+void PrintTo(const base::Optional<MediaMetadata>& metadata, std::ostream* os) {
+  if (!metadata.has_value()) {
+    *os << "<null MediaMetadata>";
+    return;
+  }
+
+  *os << "{ title=" << metadata->title << ", ";
+  *os << "artist=" << metadata->artist << ", ";
+  *os << "album=" << metadata->album << ", ";
   *os << "artwork=[";
-  for (const auto& artwork : metadata.artwork) {
+  for (const auto& artwork : metadata->artwork) {
     *os << "{ src=" << artwork.src.spec() << ", ";
     *os << "type=" << artwork.type.string() << ", ";
     *os << "sizes=[";
@@ -85,8 +99,8 @@ class MockBrowserMediaSessionManager : public BrowserMediaSessionManager {
 
   MOCK_METHOD2(OnActiveate, void(int session_id, int request_id));
   MOCK_METHOD2(OnDeactiveate, void(int session_id, int request_id));
-  MOCK_METHOD2(OnSetMetadata, void(int session_id,
-                                   const MediaMetadata& metadata));
+  MOCK_METHOD2(OnSetMetadata, void(
+      int session_id, const base::Optional<MediaMetadata>& metadata));
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MockBrowserMediaSessionManager);
@@ -129,15 +143,15 @@ class BrowserMediaSessionManagerBrowserTest : public ContentBrowserTest {
 
 IN_PROC_BROWSER_TEST_F(BrowserMediaSessionManagerBrowserTest,
                        TestMetadataPropagated) {
-  MediaMetadata expected;
-  expected.title = base::ASCIIToUTF16("title1");
-  expected.artist = base::ASCIIToUTF16("artist1");
-  expected.album = base::ASCIIToUTF16("album1");
+  base::Optional<MediaMetadata> expected = MediaMetadata();
+  expected->title = base::ASCIIToUTF16("title1");
+  expected->artist = base::ASCIIToUTF16("artist1");
+  expected->album = base::ASCIIToUTF16("album1");
   MediaMetadata::Artwork artwork;
   artwork.src = GURL("http://foo.com/bar.png");
   artwork.type = base::NullableString16(base::ASCIIToUTF16("image/png"), false);
   artwork.sizes.push_back(gfx::Size(128, 128));
-  expected.artwork.push_back(artwork);
+  expected->artwork.push_back(artwork);
 
   message_loop_runner_ = new MessageLoopRunner();
   EXPECT_CALL(*browser_media_session_manager_, OnSetMetadata(_, expected))
@@ -152,18 +166,46 @@ IN_PROC_BROWSER_TEST_F(BrowserMediaSessionManagerBrowserTest,
   // Make expectations ordered.
   InSequence s;
 
-  MediaMetadata dont_care_metadata;
+  base::Optional<MediaMetadata> dont_care_metadata = MediaMetadata();
 
-  MediaMetadata expected;
-  expected.title = base::ASCIIToUTF16("title2");
-  expected.artist = base::ASCIIToUTF16("artist2");
-  expected.album = base::ASCIIToUTF16("album2");
+  base::Optional<MediaMetadata> expected = MediaMetadata();
+  expected->title = base::ASCIIToUTF16("title2");
+  expected->artist = base::ASCIIToUTF16("artist2");
+  expected->album = base::ASCIIToUTF16("album2");
   MediaMetadata::Artwork artwork;
   artwork.src = GURL("http://foo.com/bar.jpg");
   artwork.type = base::NullableString16(
       base::ASCIIToUTF16("image/jpeg"), false);
   artwork.sizes.push_back(gfx::Size(256, 256));
-  expected.artwork.push_back(artwork);
+  expected->artwork.push_back(artwork);
+
+  // Set metadata for the first time.
+  message_loop_runner_ = new MessageLoopRunner();
+  EXPECT_CALL(*browser_media_session_manager_,
+              OnSetMetadata(_, dont_care_metadata))
+      .Times(1);
+  ASSERT_TRUE(ExecuteScript(web_contents_->GetMainFrame(),
+                            BuildSetMetadataScript(dont_care_metadata)));
+  message_loop_runner_->Run();
+
+  // Set metadata for the second time.
+  message_loop_runner_ = new MessageLoopRunner();
+  EXPECT_CALL(*browser_media_session_manager_, OnSetMetadata(_, expected))
+      .Times(1);
+  ASSERT_TRUE(ExecuteScript(web_contents_->GetMainFrame(),
+                            BuildSetMetadataScript(expected)));
+  message_loop_runner_->Run();
+}
+
+
+IN_PROC_BROWSER_TEST_F(BrowserMediaSessionManagerBrowserTest,
+                       TestNullMetadata) {
+  // Make expectations ordered.
+  InSequence s;
+
+  base::Optional<MediaMetadata> dont_care_metadata = MediaMetadata();
+
+  base::Optional<MediaMetadata> expected;
 
   // Set metadata for the first time.
   message_loop_runner_ = new MessageLoopRunner();
@@ -188,14 +230,14 @@ IN_PROC_BROWSER_TEST_F(BrowserMediaSessionManagerBrowserTest,
   // Make expectations ordered.
   InSequence s;
 
-  MediaMetadata dirty_metadata;
+  base::Optional<MediaMetadata> dirty_metadata = MediaMetadata();
   MediaMetadata::Artwork file_artwork;
   file_artwork.src = GURL("file:///foo/bar.jpg");
   file_artwork.type = base::NullableString16(
       base::ASCIIToUTF16("image/jpeg"), false);
-  dirty_metadata.artwork.push_back(file_artwork);
+  dirty_metadata->artwork.push_back(file_artwork);
 
-  MediaMetadata expected;
+  base::Optional<MediaMetadata> expected = MediaMetadata();
 
   // Set metadata for the first time.
   message_loop_runner_ = new MessageLoopRunner();