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

content/browser/browser_plugin/browser_plugin_guest.h

 // Copyright (c) 2012 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.
 
 // A BrowserPluginGuest is the browser side of a browser <--> embedder
 // renderer channel. A BrowserPlugin (a WebPlugin) is on the embedder
 // renderer side of browser <--> embedder renderer communication.
 //
 // BrowserPluginGuest lives on the UI thread of the browser process. It has a
 // helper, BrowserPluginGuestHelper, which is a RenderViewHostObserver. The
 // helper object intercepts messages (ViewHostMsg_*) directed at the browser
 // process and redirects them to this class. Any messages about the guest render
 // process that the embedder might be interested in receiving should be listened
 // for here.
 //
 // BrowserPluginGuest is a WebContentsDelegate and WebContentsObserver for the
 // guest WebContents. BrowserPluginGuest operates under the assumption that the
 // guest will be accessible through only one RenderViewHost for the lifetime of
 // the guest WebContents. Thus, cross-process navigation is not supported.
 
 #ifndef CONTENT_BROWSER_BROWSER_PLUGIN_BROWSER_PLUGIN_GUEST_H_
 #define CONTENT_BROWSER_BROWSER_PLUGIN_BROWSER_PLUGIN_GUEST_H_
 
 #include <map>
 
 #include "base/compiler_specific.h"
 #include "base/id_map.h"
 #include "base/shared_memory.h"
 #include "base/time.h"
+#include "content/common/browser_plugin_message_enums.h"
 #include "content/port/common/input_event_ack_state.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/web_contents_delegate.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebDragOperation.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebDragStatus.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebInputEvent.h"
 #include "ui/gfx/rect.h"
 #include "ui/surface/transport_dib.h"
@@ skipping 11 matching lines @@
 
 namespace WebKit {
 class WebInputEvent;
 }
 
 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_*
 // messages.
 //
 // BrowserPluginEmbedder is responsible for creating and destroying a guest.
 class CONTENT_EXPORT BrowserPluginGuest : public NotificationObserver,
                                           public WebContentsDelegate,
                                           public WebContentsObserver {
  public:
@@ skipping 70 matching lines @@
   // WebContentsDelegate implementation.
   virtual bool CanDownload(RenderViewHost* render_view_host,
                            int request_id,
                            const std::string& request_method) OVERRIDE;
   virtual bool HandleContextMenu(const ContextMenuParams& params) OVERRIDE;
   virtual void RendererUnresponsive(WebContents* source) OVERRIDE;
   virtual void RendererResponsive(WebContents* source) OVERRIDE;
   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();
 
   // Kill the guest process.
   void Terminate();
 
   // Overridden in tests.
   virtual void SetDamageBuffer(
       const BrowserPluginHostMsg_ResizeGuest_Params& params);
@@ skipping 11 matching lines @@
   int instance_id() const { return instance_id_; }
 
   // Allow the embedder to call this for unhandled messages when
   // BrowserPluginGuest is already destroyed.
   static void AcknowledgeBufferPresent(int route_id,
                                        int gpu_host_id,
                                        const std::string& mailbox_name,
                                        uint32 sync_point);
 
  private:
+  typedef std::pair<content::MediaStreamRequest, content::MediaResponseCallback>
+      MediaStreamRequestAndCallbackPair;
+  typedef std::map<int, MediaStreamRequestAndCallbackPair>
+      MediaStreamRequestsMap;
+
   friend class TestBrowserPluginGuest;
 
   BrowserPluginGuest(int instance_id,
                      WebContentsImpl* embedder_web_contents,
                      WebContentsImpl* web_contents,
                      const BrowserPluginHostMsg_CreateGuest_Params& params);
 
   base::SharedMemory* damage_buffer() const { return damage_buffer_.get(); }
   const gfx::Size& damage_view_size() const { return damage_view_size_; }
   float damage_buffer_scale_factor() const {
     return damage_buffer_scale_factor_;
   }
   // Returns the damage buffer corresponding to the handle in resize |params|.
   base::SharedMemory* GetDamageBufferFromEmbedder(
       const BrowserPluginHostMsg_ResizeGuest_Params& params);
 
   // Called when a redirect notification occurs.
   void LoadRedirect(const GURL& old_url,
                     const GURL& new_url,
                     bool is_top_level);
 
   bool InAutoSizeBounds(const gfx::Size& size) const;
 
   // Message handlers for messsages from embedder.
 
+  // Allows or denies a permission request access, after the embedder has had a
+  // chance to decide.
+  void OnAllowPermission(int instance_id,
+                         BrowserPluginPermissionType permission_type,
+                         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
   // drag-message to the guest. This routes the drag-message to the guest
   // renderer.
   void OnDragStatusUpdate(int instance_id,
                           WebKit::WebDragStatus drag_status,
                           const WebDropData& drop_data,
                           WebKit::WebDragOperationsMask drag_mask,
                           const gfx::Point& location);
@@ skipping 96 matching lines @@
   gfx::Rect guest_screen_rect_;
   base::TimeDelta guest_hang_timeout_;
   bool focused_;
   bool guest_visible_;
   bool embedder_visible_;
   std::string name_;
   bool auto_size_enabled_;
   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);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_BROWSER_PLUGIN_BROWSER_PLUGIN_GUEST_H_