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diff --git a/chromium/chrome/common/media_router/media_source.h b/chromium/chrome/common/media_router/media_source.h
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+++ b/chromium/chrome/common/media_router/media_source.h
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+// 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.
+
+#ifndef CHROME_COMMON_MEDIA_ROUTER_MEDIA_SOURCE_H_
+#define CHROME_COMMON_MEDIA_ROUTER_MEDIA_SOURCE_H_
+
+#include <iosfwd>
+#include <string>
+
+#include "base/hash/hash.h"
+#include "url/gurl.h"
+
+namespace media_router {
+
+// URL schemes used by Presentation URLs for Cast and DIAL.
+constexpr char kCastPresentationUrlScheme[] = "cast";
+constexpr char kCastDialPresentationUrlScheme[] = "cast-dial";
+constexpr char kDialPresentationUrlScheme[] = "dial";
+constexpr char kRemotePlaybackPresentationUrlScheme[] = "remote-playback";
+
+// URL prefix used by legacy Cast presentations.
+constexpr char kLegacyCastPresentationUrlPrefix[] =
+    "https://google.com/cast#__castAppId__=";
+
+// Strings used in presentation IDs by the Cast SDK implementation.
+// TODO(takumif): Move them out of this file, since they are not directly
+// related to MediaSource.
+//
+// This value must be the same as |chrome.cast.AUTO_JOIN_PRESENTATION_ID| in the
+// component extension.
+constexpr char kAutoJoinPresentationId[] = "auto-join";
+// This value must be the same as |chrome.cast.PRESENTATION_ID_PREFIX| in the
+// component extension.
+constexpr char kCastPresentationIdPrefix[] = "cast-session_";
+
+// Returns true if |url| represents a legacy Cast presentation URL, i.e., it
+// starts with |kLegacyCastPresentationUrlPrefix|.
+bool IsLegacyCastPresentationUrl(const GURL& url);
+
+// Returns true if |url| is a valid presentation URL.
+bool IsValidPresentationUrl(const GURL& url);
+
+// Returns true if |presentation_id| is an ID used by auto-join requests.
+bool IsAutoJoinPresentationId(const std::string& presentation_id);
+
+class MediaSource {
+ public:
+  using Id = std::string;
+
+  MediaSource();
+  explicit MediaSource(const MediaSource::Id& id);
+  explicit MediaSource(const GURL& presentation_url);
+  ~MediaSource();
+
+  // Gets the ID of the media source.
+  const Id& id() const { return id_; }
+
+  // If MediaSource is created from a URL, return the URL; otherwise return an
+  // empty GURL.
+  const GURL& url() const { return url_; }
+
+  // Returns true if two MediaSource objects use the same media ID.
+  bool operator==(const MediaSource& other) const { return id_ == other.id(); }
+
+  bool operator<(const MediaSource& other) const { return id_ < other.id(); }
+
+  // Hash operator for hash containers.
+  struct Hash {
+    uint32_t operator()(const MediaSource& source) const {
+      return base::Hash(source.id());
+    }
+  };
+
+  // Protocol-specific media source object creation.
+  // Returns MediaSource URI depending on the type of source.
+  static MediaSource ForTab(int tab_id);
+  static MediaSource ForTabContentRemoting(int tab_id);
+  static MediaSource ForDesktop();
+  static MediaSource ForPresentationUrl(const GURL& presentation_url);
+
+  // Returns true if source outputs its content via mirroring.
+  bool IsDesktopMirroringSource() const;
+  bool IsTabMirroringSource() const;
+  bool IsMirroringSource() const;
+
+  // Returns true if this is represents a Cast Presentation URL.
+  bool IsCastPresentationUrl() const;
+
+  // Parses the ID and returns the SessionTabHelper tab ID referencing a source
+  // tab. Returns a non-positive value on error.
+  int TabId() const;
+
+  // Checks that this is a parseable URN and is of a known type.
+  // Does not deeper protocol-level syntax checks.
+  bool IsValid() const;
+
+  // Returns true this source outputs its content via DIAL.
+  // TODO(crbug.com/804419): Move this to in-browser DIAL/Cast MRP when we have
+  // one.
+  bool IsDialSource() const;
+
+  // Returns empty string if this source is not DIAL media source, or is not a
+  // valid DIAL media source.
+  std::string AppNameFromDialSource() const;
+
+ private:
+  MediaSource::Id id_;
+  GURL url_;
+};
+
+// Only for debug logging.  This operator is defined inline so it doesn't add
+// any code in release builds.  (Omitting the definition entirely when NDEBUG is
+// defined causes linker errors on Android.)
+inline std::ostream& operator<<(std::ostream& stream,
+                                const MediaSource& source) {
+  return stream << "MediaSource[" << source.id() << "]";
+}
+
+}  // namespace media_router
+
+#endif  // CHROME_COMMON_MEDIA_ROUTER_MEDIA_SOURCE_H_