Implement HTMLMediaElement::srcObject.

Source/bindings/core/v8/custom/V8HTMLMediaElementCustom.cpp

+// Copyright 2014 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 "bindings/core/v8/V8HTMLMediaElement.h"
+
+#include "bindings/core/v8/ScriptState.h"
+#include "bindings/core/v8/ScriptValue.h"
+#include "core/html/MediaProvider.h"
+
+namespace blink {
+
+static v8::Handle<v8::Value> toV8Object(MediaProvider* provider, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
+{
+    if (provider && provider->eventTarget())
+        return toV8(provider->eventTarget(), creationContext, isolate);
+
+    return v8Undefined();
+}
+
+void blink::V8HTMLMediaElement::srcObjectAttributeGetterCustom(const v8::PropertyCallbackInfo<v8::Value>& info)
+{
+    HTMLMediaElement* impl = V8HTMLMediaElement::toImpl(info.Holder());
+    v8SetReturnValue(info, toV8Object(impl->srcObject(), info.Holder(), info.GetIsolate()));
+}
+
+void blink::V8HTMLMediaElement::srcObjectAttributeSetterCustom(v8::Local<v8::Value> value, const v8::PropertyCallbackInfo<void>& info)
+{
+    HTMLMediaElement* impl = V8HTMLMediaElement::toImpl(info.Holder());
+    ScriptValue scriptValue(ScriptState::current(info.GetIsolate()), value);

[haraken, 2014/09/20 08:52:20]

I'm sorry for the back & forth, but I begin to think that the original approach
(something like the patch set 2) looks simpler.

It looks a bit redundant (and complicated) to convert the |value| to ScriptValue
and then have the core/ do the value conversion using binding methods. It looks
simpler just to do all the conversion here in custom bindings like this:

if (V8Blob::hasInstance(value)) {
  ...;
} else if (V8MediaStream::hasInstance(value)) {
  ...;
} else if (...) {
  ...;
}

[perkj_chrome, 2014/09/24 11:39:38]

But that would require this to include bindings/modules/v8/V8MediaStream.h which
I guess is not allowed since this file is in core? Do you have a suggestion for
how to avoid that?

+    impl->setSrcObject(MediaProvider::convert(scriptValue));
+}
+
+} // namespace blink