Revert of Remove MediaStreamTrack.getSources().

third_party/WebKit/Source/modules/mediastream/MediaStreamTrackSourcesRequestImpl.cpp

Index: third_party/WebKit/Source/modules/mediastream/MediaStreamTrackSourcesRequestImpl.cpp
diff --git a/third_party/WebKit/Source/modules/mediastream/MediaStreamTrackSourcesRequestImpl.cpp b/third_party/WebKit/Source/modules/mediastream/MediaStreamTrackSourcesRequestImpl.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..1f5dfa7c86b3ae9d1d2b9ea15ca39594f28fec86
--- /dev/null
+++ b/third_party/WebKit/Source/modules/mediastream/MediaStreamTrackSourcesRequestImpl.cpp
@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2013 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY GOOGLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL GOOGLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "modules/mediastream/MediaStreamTrackSourcesRequestImpl.h"
+
+#include "core/dom/ExecutionContext.h"
+#include "core/dom/ExecutionContextTask.h"
+#include "modules/mediastream/MediaStreamTrackSourcesCallback.h"
+#include "platform/weborigin/SecurityOrigin.h"
+#include "public/platform/WebSourceInfo.h"
+#include "public/platform/WebTraceLocation.h"
+#include "wtf/Functional.h"
+
+namespace blink {
+
+MediaStreamTrackSourcesRequestImpl* MediaStreamTrackSourcesRequestImpl::create(
+    ExecutionContext& context,
+    MediaStreamTrackSourcesCallback* callback) {
+  return new MediaStreamTrackSourcesRequestImpl(context, callback);
+}
+
+MediaStreamTrackSourcesRequestImpl::MediaStreamTrackSourcesRequestImpl(
+    ExecutionContext& context,
+    MediaStreamTrackSourcesCallback* callback)
+    : m_callback(callback), m_executionContext(&context) {}
+
+MediaStreamTrackSourcesRequestImpl::~MediaStreamTrackSourcesRequestImpl() {}
+
+PassRefPtr<SecurityOrigin> MediaStreamTrackSourcesRequestImpl::origin() {
+  return m_executionContext->getSecurityOrigin()->isolatedCopy();
+}
+
+void MediaStreamTrackSourcesRequestImpl::requestSucceeded(
+    const WebVector<WebSourceInfo>& webSourceInfos) {
+  DCHECK(m_callback);
+
+  for (size_t i = 0; i < webSourceInfos.size(); ++i)
+    m_sourceInfos.append(SourceInfo::create(webSourceInfos[i]));
+  m_executionContext->postTask(
+      BLINK_FROM_HERE, createCrossThreadTask(
+                           &MediaStreamTrackSourcesRequestImpl::performCallback,
+                           wrapCrossThreadPersistent(this)));
+}
+
+void MediaStreamTrackSourcesRequestImpl::performCallback() {
+  m_callback->handleEvent(m_sourceInfos);
+  m_callback.clear();
+}
+
+DEFINE_TRACE(MediaStreamTrackSourcesRequestImpl) {
+  visitor->trace(m_callback);
+  visitor->trace(m_executionContext);
+  visitor->trace(m_sourceInfos);
+  MediaStreamTrackSourcesRequest::trace(visitor);
+}
+
+}  // namespace blink