[MediaRouter] Add implementation of PresentationServiceDelegate

chrome/browser/media/router/presentation_frame_map.h

+// 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_BROWSER_MEDIA_ROUTER_PRESENTATION_FRAME_MAP_H_
+#define CHROME_BROWSER_MEDIA_ROUTER_PRESENTATION_FRAME_MAP_H_
+
+#include <map>
+
+#include "base/containers/scoped_ptr_hash_map.h"
+#include "base/memory/scoped_ptr.h"
+#include "content/public/browser/presentation_service_delegate.h"
+
+namespace content {
+class PresentationScreenAvailabilityListener;
+class WebContents;
+}
+
+namespace media_router {
+class PresentationFrame;
+
+// Helper class for PresentationServiceDelegateImpl to manage

[mark a. foltz, 2015/05/14 22:20:46]

Similar comments to PresentationFrame:
- If it is an implementation detail that does not need a unit test
define+declare in PSDI.cc
- Otherwise merge with PSDI.h/.cc

[haibinlu, 2015/05/15 23:32:29]

Merged to PSDI.cc

+// PresentationFrames.
+class PresentationFrameMap {
+ public:
+  using RenderFrameHostId =
+      content::PresentationServiceDelegate::RenderFrameHostId;
+  using DelegateObserver = content::PresentationServiceDelegate::Observer;
+
+  explicit PresentationFrameMap(content::WebContents* web_contents);
+  ~PresentationFrameMap();

[mark a. foltz, 2015/05/14 22:20:45]

virtual

[haibinlu, 2015/05/15 23:32:29]

Done.

+
+  bool AddScreenAvailabilityListener(

[mark a. foltz, 2015/05/14 22:20:45]

Add docstrings to public method declarations

[haibinlu, 2015/05/15 23:32:29]

Done.

+      int render_process_id,
+      int render_frame_id,
+      content::PresentationScreenAvailabilityListener* listener);
+  void RemoveScreenAvailabilityListener(
+      int render_process_id,
+      int render_frame_id,
+      content::PresentationScreenAvailabilityListener* listener);
+
+  void SetDefaultPresentationInfo(int render_process_id,
+                                  int render_frame_id,
+                                  const std::string& default_presentation_url,
+                                  const std::string& default_presentation_id);
+  // Return empty string if no default presentation ID is set in the frame.
+  std::string GetDefaultPresentationId(RenderFrameHostId rfh_id) const;
+
+  void SetDelegateObserver(int render_process_id,
+                           int render_frame_id,
+                           DelegateObserver* observer);
+  DelegateObserver* GetDelegateObserver(RenderFrameHostId rfh_id) const;
+
+  void Reset(int render_process_id, int render_frame_id);
+
+ private:
+  base::ScopedPtrHashMap<RenderFrameHostId, scoped_ptr<PresentationFrame>>

[mark a. foltz, 2015/05/14 22:20:45]

Add a comment explaining this map, i.e. "Maps a frame identifier to a
PresentationFrame object for frames that are listening to screen availability."

[haibinlu, 2015/05/15 23:32:29]

Done.

+      frames_;
+
+  size_t num_sink_observers_;

[mark a. foltz, 2015/05/14 22:20:45]

What is a sink observer in this context?  Is it the same as a |listener| from
the API above?

Please add a comment explaining.

[haibinlu, 2015/05/15 23:32:29]

Removed. Calculated # of screen availability listener on-demand, the complexity
is O(# of presentation frames). 

+
+  // Does not own these two objects.

[mark a. foltz, 2015/05/14 22:20:45]

Please comment about why this is okay.

+  MediaRouter* router_;
+  content::WebContents* web_contents_;
+};
+
+}  // namespace media_router
+
+#endif  // CHROME_BROWSER_MEDIA_ROUTER_PRESENTATION_FRAME_MAP_H_