Media Controls a11y: add text/description/role to more controls components.

third_party/WebKit/public/platform/WebLocalizedString.h

Index: third_party/WebKit/public/platform/WebLocalizedString.h
diff --git a/third_party/WebKit/public/platform/WebLocalizedString.h b/third_party/WebKit/public/platform/WebLocalizedString.h
index ae2e50e152c193f0cc1fa2d92b45b3266b8c94a0..13ffbbc14d4e93d2550cf5abe41708ce7644069f 100644
--- a/third_party/WebKit/public/platform/WebLocalizedString.h
+++ b/third_party/WebKit/public/platform/WebLocalizedString.h
@@ -53,13 +53,14 @@ struct WebLocalizedString {
     AXMediaAudioElement,
     AXMediaAudioElementHelp,
     AXMediaAudioSliderHelp,
-    AxMediaCastOffButton,
-    AxMediaCastOffButtonHelp,
-    AxMediaCastOnButton,
-    AxMediaCastOnButtonHelp,
+    AXMediaCastOffButton,
+    AXMediaCastOffButtonHelp,
+    AXMediaCastOnButton,
+    AXMediaCastOnButtonHelp,
     AXMediaCurrentTimeDisplay,
     AXMediaCurrentTimeDisplayHelp,
     AXMediaDefault,
+    AXMediaDownloadButton,
     AXMediaEnterFullscreenButton,
     AXMediaEnterFullscreenButtonHelp,
     AXMediaExitFullscreenButton,
@@ -68,7 +69,8 @@ struct WebLocalizedString {
     AXMediaHideClosedCaptionsButtonHelp,
     AXMediaMuteButton,
     AXMediaMuteButtonHelp,
-    AxMediaOverflowButton,
+    AXMediaOverflowButton,
+    AXMediaOverflowButtonHelp,
     AXMediaPauseButton,
     AXMediaPauseButtonHelp,
     AXMediaPlayButton,