Implement feature policy checks in the browser process

chrome/browser/media/webrtc/media_stream_device_permission_context.cc

 // Copyright 2015 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/media/webrtc/media_stream_device_permission_context.h"
 #include "base/feature_list.h"
 #include "chrome/browser/media/webrtc/media_stream_device_permissions.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/chrome_features.h"
 #include "chrome/common/pref_names.h"
 #include "components/content_settings/core/browser/host_content_settings_map.h"
 #include "components/content_settings/core/common/content_settings.h"
 #include "content/public/common/content_features.h"
 #include "content/public/common/url_constants.h"
 #include "extensions/common/constants.h"
 
+namespace {
+
+blink::WebFeaturePolicyFeature GetFeaturePolicyFeature(
+    ContentSettingsType type) {
+  if (type == CONTENT_SETTINGS_TYPE_MEDIASTREAM_MIC) {
+    return blink::WebFeaturePolicyFeature::kMicrophone;
+  } else {

[Sergey Ulanov, 2017/05/30 18:21:06]

No else after return, please
https://chromium.googlesource.com/chromium/src/+/master/styleguide/c++/c++.md

Or alternatively use switch statement here

[raymes, 2017/05/31 07:07:54]

Done.

+    DCHECK_EQ(CONTENT_SETTINGS_TYPE_MEDIASTREAM_CAMERA, type);
+    return blink::WebFeaturePolicyFeature::kCamera;
+  }
+}
+
+}  // namespace
+
 MediaStreamDevicePermissionContext::MediaStreamDevicePermissionContext(
     Profile* profile,
     const ContentSettingsType content_settings_type)
-    : PermissionContextBase(profile, content_settings_type),
+    : PermissionContextBase(profile,
+                            content_settings_type,
+                            GetFeaturePolicyFeature(content_settings_type)),
       content_settings_type_(content_settings_type) {
   DCHECK(content_settings_type_ == CONTENT_SETTINGS_TYPE_MEDIASTREAM_MIC ||
          content_settings_type_ == CONTENT_SETTINGS_TYPE_MEDIASTREAM_CAMERA);
 }
 
 MediaStreamDevicePermissionContext::~MediaStreamDevicePermissionContext() {}
 
 void MediaStreamDevicePermissionContext::DecidePermission(
     content::WebContents* web_contents,
     const PermissionRequestID& id,
@@ skipping 57 matching lines @@
 void MediaStreamDevicePermissionContext::CancelPermissionRequest(
     content::WebContents* web_contents,
     const PermissionRequestID& id) {
   NOTREACHED() << "CancelPermissionRequest is not implemented";
 }
 
 bool MediaStreamDevicePermissionContext::IsRestrictedToSecureOrigins() const {
   return base::FeatureList::IsEnabled(
       features::kRequireSecureOriginsForPepperMediaRequests);
 }