<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 f4a36614fe69c6952d07e53f784c7094d9e6f3c9..d7a216bb8c2e040f3b129c6fd28a1fe02a3785f8 100644
--- a/content/browser/browser_plugin/browser_plugin_guest.h
+++ b/content/browser/browser_plugin/browser_plugin_guest.h
@@ -38,8 +38,8 @@
 #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/WebDragStatus.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebDragOperation.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebDragStatus.h"
 #include "ui/gfx/rect.h"
 
 struct BrowserPluginHostMsg_AutoSize_Params;
@@ -59,6 +59,7 @@ 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_*
@@ -134,6 +135,10 @@ 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;
 
   void UpdateRect(RenderViewHost* render_view_host,
                   const ViewHostMsg_UpdateRect_Params& params);
@@ -200,6 +205,11 @@ class CONTENT_EXPORT BrowserPluginGuest : public NotificationObserver,
   // web contents.
   void Resize(RenderViewHost* embedder_rvh,
               const BrowserPluginHostMsg_ResizeGuest_Params& params);
+  // Allows or denies a media access request, after the embedder has had a
+  // chance to decide.
+  void AllowMediaAccess(WebContents* embedder_web_contents,
+                        int request_id,
+                        bool should_allow);
 
   // Overridden in tests.
   // Handles input event routed through the embedder (which is initiated in the
@@ -227,6 +237,11 @@ 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,
@@ -281,6 +296,14 @@ class CONTENT_EXPORT BrowserPluginGuest : public NotificationObserver,
   bool auto_size_;
   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);
 };