<webview>: First stab at implementing media permission request for guests.

content/browser/browser_plugin/browser_plugin_guest.h

Index: content/browser/browser_plugin/browser_plugin_guest.h
diff --git a/content/browser/browser_plugin/browser_plugin_guest.h b/content/browser/browser_plugin/browser_plugin_guest.h
index 3c8254fa1d3e396818ff939dda40ed133e27d069..7ac8416b985a94cd590f5ff99e7e2f80a0931fb9 100644
--- a/content/browser/browser_plugin/browser_plugin_guest.h
+++ b/content/browser/browser_plugin/browser_plugin_guest.h
@@ -53,6 +53,7 @@ namespace content {
 class BrowserPluginHostFactory;
 class BrowserPluginEmbedder;
 class RenderProcessHost;
+struct MediaStreamRequest;
 
 // A browser plugin guest provides functionality for WebContents to operate in
 // the guest role and implements guest specific overrides for ViewHostMsg_*
@@ -119,6 +120,10 @@ class CONTENT_EXPORT BrowserPluginGuest : public NotificationObserver,
                            const std::string& request_method) OVERRIDE;
   virtual bool HandleContextMenu(const ContextMenuParams& params) OVERRIDE;
   virtual void RendererUnresponsive(WebContents* source) OVERRIDE;
+  virtual void RequestMediaAccessPermission(
+      WebContents* web_contents,
+      const content::MediaStreamRequest* request,
+      const content::MediaResponseCallback& callback) OVERRIDE;
 
   void UpdateRect(RenderViewHost* render_view_host,
                   const ViewHostMsg_UpdateRect_Params& params);
@@ -166,6 +171,11 @@ class CONTENT_EXPORT BrowserPluginGuest : public NotificationObserver,
   // Kill the guest process.
   void Terminate();
 
+  // Allows or denies media access request.
+  void AllowMediaAccess(WebContents* embedder_web_contents,
+                        int request_id,
+                        bool allow);
+
   // Overridden in tests.
   virtual bool ViewTakeFocus(bool reverse);
   // If possible, navigate the guest to |relative_index| entries away from the
@@ -186,6 +196,11 @@ class CONTENT_EXPORT BrowserPluginGuest : public NotificationObserver,
                                float scale_factor);
 
  private:
+  typedef std::pair<content::MediaStreamRequest, content::MediaResponseCallback>
+      MediaStreamRequestAndCallbackPair;
+  typedef std::map<int, MediaStreamRequestAndCallbackPair>
+      MediaStreamRequestsMap;
+
   friend class TestBrowserPluginGuest;
 
   BrowserPluginGuest(int instance_id,
@@ -234,6 +249,11 @@ class CONTENT_EXPORT BrowserPluginGuest : public NotificationObserver,
   int pending_update_counter_;
   base::TimeDelta guest_hang_timeout_;
   bool visible_;
+  // A map to store WebContents's media request object and callback.
+  // We need to store these because we need a roundtrip to the embedder to know
+  // if we allow or disallow the request. The key of the map is unique only for
+  // a given BrowserPluginGuest.
+  MediaStreamRequestsMap media_requests_map_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserPluginGuest);
 };