Implement modal permission prompts for media permissions on Android.

chrome/browser/permissions/permission_dialog_delegate.h

Index: chrome/browser/permissions/permission_dialog_delegate.h
diff --git a/chrome/browser/permissions/permission_dialog_delegate.h b/chrome/browser/permissions/permission_dialog_delegate.h
index 6215383d9ca7bd013c51333008e03bd1845677b5..de9c47d82abc7f9d74b10810ab0ae70dfc905338 100644
--- a/chrome/browser/permissions/permission_dialog_delegate.h
+++ b/chrome/browser/permissions/permission_dialog_delegate.h
@@ -21,6 +21,7 @@ namespace content {
 class WebContents;
 }
 
+class MediaStreamDevicesController;
 class GURL;
 class PermissionInfoBarDelegate;
 class Profile;
@@ -46,6 +47,12 @@ class PermissionDialogDelegate : content::WebContentsObserver {
                      Profile* profile,
                      const PermissionSetCallback& callback);
 
+  // Creates a modal dialog for a media stream permission request.
+  // TODO: remove this when media stream requests are eventually folded in with

[raymes, 2016/11/02 08:09:04]

nit: Please add yourself as the TODO(author). Having yourself in a TODO doesn't
mean that you have to be the one to fix it, it just means that your are the one
who knows something about it.

[dominickn, 2016/11/03 00:34:09]

Done.

+  // other permission requests.
+  static void CreateMediaStreamDialog(
+      content::WebContents* web_contents,
+      std::unique_ptr<MediaStreamDevicesController> controller);
 
   // Returns true if we should show the user a modal permission prompt rather
   // than an infobar.