Update all float attributes in HTMLMediaElement and related objects to double

LayoutTests/media/video-playbackrate.html

Index: LayoutTests/media/video-playbackrate.html
diff --git a/LayoutTests/media/video-playbackrate.html b/LayoutTests/media/video-playbackrate.html
index 9bf2839c6e76bc3b38e0b5904b27adebadc8c9ae..4999ff3bb001e6db9a7dabf7fd7ee27447247b04 100644
--- a/LayoutTests/media/video-playbackrate.html
+++ b/LayoutTests/media/video-playbackrate.html
@@ -62,6 +62,23 @@
                 testExpected("video.playbackRate", 1);
                 testExpected("video.defaultPlaybackRate", 2);
                 consoleWrite("");
+
+                consoleWrite("Test extreme playback rates");
+                run("video.defaultPlaybackRate = Number.MIN_VALUE");
+                testExpected("video.defaultPlaybackRate", Number.MIN_VALUE);
+                consoleWrite("");
+
+                run("video.defaultPlaybackRate = Number.MAX_VALUE");
+                testExpected("video.defaultPlaybackRate", Number.MAX_VALUE);
+                consoleWrite("");
+
+                run("video.playbackRate = Number.MIN_VALUE");
+                testExpected("video.playbackRate", Number.MIN_VALUE);
+                consoleWrite("");
+
+                run("video.playbackRate = Number.MAX_VALUE");
+                testExpected("video.playbackRate", Number.MAX_VALUE);
+                consoleWrite("");
                 endTest();
             }