<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 f0b3039019282c15f0822198145f4d4ffb08597c..6d2fdad681b8b95aca276cf09f5d1bcfc888c058 100644
--- a/content/browser/browser_plugin/browser_plugin_guest.h
+++ b/content/browser/browser_plugin/browser_plugin_guest.h
@@ -58,6 +58,7 @@ 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_*
@@ -147,6 +148,10 @@ class CONTENT_EXPORT BrowserPluginGuest : public NotificationObserver,
   virtual void RunFileChooser(WebContents* web_contents,
                               const FileChooserParams& params) OVERRIDE;
   virtual bool ShouldFocusPageAfterCrash() OVERRIDE;
+  virtual void RequestMediaAccessPermission(
+      WebContents* web_contents,
+      const content::MediaStreamRequest& request,
+      const content::MediaResponseCallback& callback) OVERRIDE;
 
   // Exposes the protected web_contents() from WebContentsObserver.
   WebContents* GetWebContents();
@@ -154,6 +159,7 @@ class CONTENT_EXPORT BrowserPluginGuest : public NotificationObserver,
   // Kill the guest process.
   void Terminate();
 
+
   // Overridden in tests.
   virtual void SetDamageBuffer(
       const BrowserPluginHostMsg_ResizeGuest_Params& params);
@@ -171,6 +177,11 @@ class CONTENT_EXPORT BrowserPluginGuest : public NotificationObserver,
   int instance_id() const { return instance_id_; }
 
  private:
+  typedef std::pair<content::MediaStreamRequest, content::MediaResponseCallback>
+      MediaStreamRequestAndCallbackPair;
+  typedef std::map<int, MediaStreamRequestAndCallbackPair>
+      MediaStreamRequestsMap;
+
   friend class TestBrowserPluginGuest;
 
   BrowserPluginGuest(int instance_id,
@@ -195,6 +206,9 @@ class CONTENT_EXPORT BrowserPluginGuest : public NotificationObserver,
 
   // Message handlers for messsages from embedder.
 
+  // Allows or denies a media access request, after the embedder has had a
+  // chance to decide.
+  void OnAllowMediaAccess(int instance_id, int request_id, bool should_allow);
   // Handles drag events from the embedder.
   // When dragging, the drag events go to the embedder first, and if the drag
   // happens on the browser plugin, then the plugin sends a corresponding
@@ -303,6 +317,15 @@ class CONTENT_EXPORT BrowserPluginGuest : public NotificationObserver,
   gfx::Size max_auto_size_;
   gfx::Size min_auto_size_;
 
+  // A counter to generate unique request id for a media access request.
+  // We only need the ids to be unique for a given BrowserPluginGuest.
+  int current_media_access_request_id_;
+  // 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);
 };