Web MIDI: prepare to deprecate MIDIMessageEvent::receivedTime

third_party/WebKit/LayoutTests/webmidi/loopback-receive.html

Index: third_party/WebKit/LayoutTests/webmidi/loopback-receive.html
diff --git a/third_party/WebKit/LayoutTests/webmidi/loopback-receive.html b/third_party/WebKit/LayoutTests/webmidi/loopback-receive.html
index 9728155a3a70d1aa81c44e2be35522c4705aa1d1..e052dbeebc1aee7798f0a35290bea0b4a0c6457f 100644
--- a/third_party/WebKit/LayoutTests/webmidi/loopback-receive.html
+++ b/third_party/WebKit/LayoutTests/webmidi/loopback-receive.html
@@ -43,6 +43,8 @@ function verifyData(e) {
     expected = testData[receiveCount];
     actual = e.data;
     shouldBe("actual", "expected");
+    receivedTimeIsDefined = e.receivedTime !== undefined;
+    shouldBeDefined(receivedTimeIsDefined);

[kouhei (in TOK), 2016/06/29 05:25:32]

This is evaled. See:
https://cs.chromium.org/chromium/src/third_party/WebKit/LayoutTests/battery-s...

[Takashi Toyoshima, 2016/06/30 10:12:18]

That results in showing actual receivedTime value in the expectation log.
But, the value depends on timing, then expectation won't be matched.
This is a workaround to avoid that problem.

     receiveCount++;
     if (receiveCount == testData.length)
         e.target.resolve();