NOT FOR LANDING Introduce and use WebMediaSession

Source/modules/mediasession/MediaSessionError.cpp

Index: Source/modules/mediasession/MediaSessionError.cpp
diff --git a/Source/modules/mediasession/MediaSessionError.cpp b/Source/modules/mediasession/MediaSessionError.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..18974ba5fcd6d0c75eae47b8461cd790a28e93a2
--- /dev/null
+++ b/Source/modules/mediasession/MediaSessionError.cpp
@@ -0,0 +1,28 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "config.h"
+#include "modules/mediasession/MediaSessionError.h"
+
+#include "bindings/core/v8/ScriptPromiseResolver.h"
+
+namespace blink {
+
+// static
+v8::Local<v8::Value> MediaSessionError::take(ScriptPromiseResolver* resolver, const WebMediaSessionError& webError)
+{
+    v8::Isolate* isolate = resolver->scriptState()->isolate();
+
+    switch (webError.errorType) {
+    case WebMediaSessionError::ErrorTypeActivate:
+        return v8::Exception::TypeError(v8String(isolate, "The media session activation failed."));
+    case WebMediaSessionError::ErrorTypeUnknown:
+        return v8::Exception::Error(v8String(isolate, "An unknown error occurred within media session."));
+    }
+
+    ASSERT_NOT_REACHED();
+    return v8::Exception::Error(v8String(isolate, "An unknown error occurred."));
+}
+
+} // namespace blink