Have HTMLMediaElement::play() return a Promise.

third_party/WebKit/Source/core/html/HTMLVideoElementTest.cpp

Index: third_party/WebKit/Source/core/html/HTMLVideoElementTest.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLVideoElementTest.cpp b/third_party/WebKit/Source/core/html/HTMLVideoElementTest.cpp
index b5ed951b2b0bdc21186ab55d21f0b55d24aa320f..dd83c36af0346c3986fa0f86e63df435ff41ebb8 100644
--- a/third_party/WebKit/Source/core/html/HTMLVideoElementTest.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLVideoElementTest.cpp
@@ -104,7 +104,7 @@ TEST_F(HTMLVideoElementTest, setBufferingStrategy_NonUserPause)
 
     // On play, the strategy is set to normal.
     EXPECT_CALL(*player, setBufferingStrategy(WebMediaPlayer::BufferingStrategy::Normal));
-    m_video->play();
+    m_video->playInternal();
     ::testing::Mock::VerifyAndClearExpectations(player);
 
     // On a non-user pause, the strategy is not changed.
@@ -113,7 +113,7 @@ TEST_F(HTMLVideoElementTest, setBufferingStrategy_NonUserPause)
 
     // On play, the strategy is set to normal.
     EXPECT_CALL(*player, setBufferingStrategy(WebMediaPlayer::BufferingStrategy::Normal));
-    m_video->play();
+    m_video->playInternal();
     ::testing::Mock::VerifyAndClearExpectations(player);
 }
 
@@ -125,7 +125,7 @@ TEST_F(HTMLVideoElementTest, setBufferingStrategy_UserPause)
 
     // On play, the strategy is set to normal.
     EXPECT_CALL(*player, setBufferingStrategy(WebMediaPlayer::BufferingStrategy::Normal));
-    m_video->play();
+    m_video->playInternal();
     ::testing::Mock::VerifyAndClearExpectations(player);
 
     // On a user pause, the strategy is set to aggressive.
@@ -138,7 +138,7 @@ TEST_F(HTMLVideoElementTest, setBufferingStrategy_UserPause)
 
     // On play, the strategy is set to normal.
     EXPECT_CALL(*player, setBufferingStrategy(WebMediaPlayer::BufferingStrategy::Normal));
-    m_video->play();
+    m_video->playInternal();
     ::testing::Mock::VerifyAndClearExpectations(player);
 }