MediaCaptureFromElement: add support for audio captureStream().

third_party/WebKit/Source/modules/mediacapturefromelement/HTMLMediaElementCapture.cpp

Index: third_party/WebKit/Source/modules/mediacapturefromelement/HTMLMediaElementCapture.cpp
diff --git a/third_party/WebKit/Source/modules/mediacapturefromelement/HTMLMediaElementCapture.cpp b/third_party/WebKit/Source/modules/mediacapturefromelement/HTMLMediaElementCapture.cpp
index 478a74db936ae535ef8852c4ddb8a58bf16d5d13..aad4dab4c61a1e4856448a4223b901f9342494eb 100644
--- a/third_party/WebKit/Source/modules/mediacapturefromelement/HTMLMediaElementCapture.cpp
+++ b/third_party/WebKit/Source/modules/mediacapturefromelement/HTMLMediaElementCapture.cpp
@@ -6,6 +6,8 @@
 
 #include "core/dom/ExceptionCode.h"
 #include "core/html/HTMLMediaElement.h"
+#include "core/html/track/AudioTrackList.h"
+#include "core/html/track/VideoTrackList.h"
 #include "modules/encryptedmedia/HTMLMediaElementEncryptedMedia.h"
 #include "modules/encryptedmedia/MediaKeys.h"
 #include "modules/mediastream/MediaStream.h"
@@ -37,17 +39,14 @@ MediaStream* HTMLMediaElementCapture::captureStream(HTMLMediaElement& element, E
         return MediaStream::create(element.getExecutionContext(), MediaStreamRegistry::registry().lookupMediaStreamDescriptor(element.currentSrc().getString()));
     }
 
-    // TODO(mcasas): Only <video> tags are supported at the moment.
-    if (element.isHTMLAudioElement()) {
-        NOTIMPLEMENTED();
-        return nullptr;
-    }
-
     WebMediaStream webStream;
     webStream.initialize(WebVector<WebMediaStreamTrack>(), WebVector<WebMediaStreamTrack>());
     MediaStreamCenter::instance().didCreateMediaStream(webStream);
 
-    Platform::current()->createHTMLVideoElementCapturer(&webStream, element.webMediaPlayer());
+    if (element.hasVideo())
+        Platform::current()->createHTMLVideoElementCapturer(&webStream, element.webMediaPlayer());
+    if (element.hasAudio())
+        Platform::current()->createHTMLAudioElementCapturer(&webStream, element.webMediaPlayer());
     return MediaStream::create(element.getExecutionContext(), webStream);
 }