Have HTMLMediaElement::play() return a Promise.

third_party/WebKit/Source/core/testing/Internals.cpp

Index: third_party/WebKit/Source/core/testing/Internals.cpp
diff --git a/third_party/WebKit/Source/core/testing/Internals.cpp b/third_party/WebKit/Source/core/testing/Internals.cpp
index 61c65d97110aed9eee14f12335f19cf89b4757ce..071c4ec26f484d0c26693d911c94bb530c838666 100644
--- a/third_party/WebKit/Source/core/testing/Internals.cpp
+++ b/third_party/WebKit/Source/core/testing/Internals.cpp
@@ -2548,8 +2548,8 @@ double Internals::monotonicTimeToZeroBasedDocumentTime(double platformTime, Exce
 void Internals::setMediaElementNetworkState(HTMLMediaElement* mediaElement, int state)
 {
     ASSERT(mediaElement);
-    ASSERT(state >= HTMLMediaElement::NetworkState::NETWORK_EMPTY);
-    ASSERT(state <= HTMLMediaElement::NetworkState::NETWORK_NO_SOURCE);
+    ASSERT(state >= WebMediaPlayer::NetworkState::NetworkStateEmpty);
+    ASSERT(state <= WebMediaPlayer::NetworkState::NetworkStateDecodeError);
     mediaElement->setNetworkState(static_cast<WebMediaPlayer::NetworkState>(state));
 }