Pass origin to StartObservingMediaSinks.

chrome/browser/media/router/media_source.h

Index: chrome/browser/media/router/media_source.h
diff --git a/chrome/browser/media/router/media_source.h b/chrome/browser/media/router/media_source.h
index 288cb27b7791bdfdca6d04ce345df9aeb64ce604..f95f154c8e386a06294a0b86dbffff3d7c2afdd9 100644
--- a/chrome/browser/media/router/media_source.h
+++ b/chrome/browser/media/router/media_source.h
@@ -26,6 +26,12 @@ class MediaSource {
   // Gets the ID of the media source.
   MediaSource::Id id() const;
 
+  // Gets the origin of the media source.
+  std::string origin() const;
+
+  // Sets the origin of the media source.
+  void set_origin(std::string origin);
+
   // Returns true if two MediaSource objects use the same media ID.
   bool Equals(const MediaSource& other) const;
 
@@ -35,17 +41,23 @@ class MediaSource {
   // Used for logging.
   std::string ToString() const;
 
-  // Hash operator for hash containers.
-  struct Hash {
-    size_t operator()(const MediaSource& source) const {
-      return base::Hash(source.id());
-    }
-  };
+  bool operator==(const MediaSource& other) const;
+  bool operator<(const MediaSource& other) const;
 
  private:
   MediaSource::Id id_;
+  std::string origin_;
 };
 
 }  // namespace media_router
 
+namespace std {
+template <> struct hash<media_router::MediaSource> {
+    size_t operator () (const media_router::MediaSource &m) const {
+      return base::HashInts32(base::Hash(m.id()),
+                              base::Hash(m.origin()));
+    }
+};
+}
+
 #endif  // CHROME_BROWSER_MEDIA_ROUTER_MEDIA_SOURCE_H_