Whitelist Google Hangouts origins to access Screen Capture API.

chrome/browser/ui/screen_capture_infobar_delegate.cc

 // Copyright (c) 2013 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.
 
 #include "chrome/browser/ui/screen_capture_infobar_delegate.h"
 
 #include "base/command_line.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/api/infobars/infobar_service.h"
 #include "chrome/common/chrome_switches.h"
 #include "grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 
+namespace {
+
+// This is a short-term solution to allow testing of the the Screen Capture API
+// with Google Hangouts in M27.
+// TODO(sergeyu): Remove this whitelist as soon as possible.
+bool IsWhitelistedOrigin(const GURL& origin) {
+#if defined(OFFICIAL_BUILD)
+  return origin.spec() == "https://staging.talkgadget.google.com/" ||
+      origin.spec() == "https://plus.google.com/";
+#else
+  return false;
+#endif
+}
+
+}  // namespace
+
 // static
 void ScreenCaptureInfoBarDelegate::Create(
     content::WebContents* web_contents,
     const content::MediaStreamRequest& request,
     const content::MediaResponseCallback& callback) {
   bool screen_capture_enabled = CommandLine::ForCurrentProcess()->HasSwitch(
-      switches::kEnableUserMediaScreenCapturing);
+      switches::kEnableUserMediaScreenCapturing) ||
+      IsWhitelistedOrigin(request.security_origin);
   // Deny request automatically in the following cases:
   //  1. Screen capturing is not enabled via command line switch.
   //  2. Audio capture was requested (it's not supported yet).
   //  3. Request from a page that was not loaded from a secure origin.
   if (!screen_capture_enabled ||
       request.audio_type != content::MEDIA_NO_SERVICE ||
       !request.security_origin.SchemeIsSecure()) {
     callback.Run(content::MediaStreamDevices());
     return;
   }
@@ skipping 62 matching lines @@
 }
 
 bool ScreenCaptureInfoBarDelegate::Cancel() {
   Deny();
   return true;
 }
 
 void ScreenCaptureInfoBarDelegate::Deny() {
   callback_.Run(content::MediaStreamDevices());
 }