refactor to Introduce AUDIO_CAPTURE and VIDEO_CAPTURE permissions.

chrome/browser/media/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/media_stream_device_permission_context.h"
+#include "chrome/browser/media/media_stream_device_permissions.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/common/pref_names.h"
+#include "components/content_settings/core/browser/host_content_settings_map.h"
+
+MediaStreamDevicePermissionContext::MediaStreamDevicePermissionContext(
+    Profile* profile,
+    const ContentSettingsType permission_type)
+    : PermissionContextBase(profile, permission_type) {
+  CHECK(permission_type == CONTENT_SETTINGS_TYPE_MEDIASTREAM_MIC ||
+        permission_type == CONTENT_SETTINGS_TYPE_MEDIASTREAM_CAMERA);
+}
+
+MediaStreamDevicePermissionContext::~MediaStreamDevicePermissionContext() {}
+
+bool MediaStreamDevicePermissionContext::IsRestrictedToSecureOrigins() const {

[raymes, 2015/08/26 03:07:36]

Please keep functions in the same order as the header file

[guoweis_left_chromium, 2015/08/26 22:29:57]

Done.

+  return true;
+}
+
+void MediaStreamDevicePermissionContext::RequestPermission(
+    content::WebContents* web_contents,
+    const PermissionRequestID& id,
+    const GURL& requesting_frame,
+    bool user_gesture,
+    const BrowserPermissionCallback& callback) {
+  CHECK(0) << "RequestPermission is not implemented";

[raymes, 2015/08/26 03:07:36]

We would typically use NOTREACHED() here. (and below)

[guoweis_left_chromium, 2015/08/26 22:29:57]

Done.

+}
+
+ContentSetting MediaStreamDevicePermissionContext::GetPermissionStatus(
+    const GURL& requesting_origin,
+    const GURL& embedding_origin) const {
+  // TODO(raymes): Merge this policy check into content settings
+  // crbug.com/244389.
+  const char* policy_name = nullptr;
+  const char* urls_policy_name = nullptr;
+  if (content_settings_type() == CONTENT_SETTINGS_TYPE_MEDIASTREAM_MIC) {
+    policy_name = prefs::kAudioCaptureAllowed;
+    urls_policy_name = prefs::kAudioCaptureAllowedUrls;
+  } else if (content_settings_type() ==
+             CONTENT_SETTINGS_TYPE_MEDIASTREAM_CAMERA) {
+    policy_name = prefs::kVideoCaptureAllowed;
+    urls_policy_name = prefs::kVideoCaptureAllowedUrls;
+  } else {
+    NOTREACHED();
+  }
+
+  // TODO(guoweis): why are we using embedding_origin?

[raymes, 2015/08/26 03:07:36]

You tell me: why are we using embedding origin :)?

[mlamouri (slow - plz ping), 2015/08/26 13:49:34]

If embedder.com has an iframe to website.com and website.com gets a permission,
it might be different than website.com getting it while it's the top frame.

[guoweis_left_chromium, 2015/08/26 22:29:57]

Done.

+  MediaStreamDevicePolicy policy = GetDevicePolicy(
+      profile(), embedding_origin, policy_name, urls_policy_name);
+
+  if (policy == ALWAYS_DENY)
+    return CONTENT_SETTING_BLOCK;
+
+  if (policy == ALWAYS_ALLOW)
+    return CONTENT_SETTING_ALLOW;
+
+  DCHECK(policy == POLICY_NOT_SET);

[raymes, 2015/08/26 03:07:36]

DCHECK_EQ

[guoweis_left_chromium, 2015/08/26 22:29:57]

Done.

+  // Check the content setting.
+  ContentSetting setting =
+      profile()->GetHostContentSettingsMap()->GetContentSetting(
+          requesting_origin, embedding_origin, content_settings_type(),

[raymes, 2015/08/26 03:07:36]

This should use requesting_origin, requesting_origin to match the previous
behavior.

[mlamouri (slow - plz ping), 2015/08/26 13:49:34]

Could you just call PermissionContextBase::GetPermissionStatus() ?

[guoweis_left_chromium, 2015/08/26 22:29:57]

Done.

[raymes, 2015/08/27 05:54:18]

This will break the current behavior for the media permission, which is to
consider only the requesting origin. I would suggest keeping this as
GetPermissionStatus(requesting_origin, requesting_origin) in this CL. If we want
to change the scoping, we should do it as a separate change.

+          content_settings::ResourceIdentifier());
+
+  if (setting == CONTENT_SETTING_DEFAULT)
+    return CONTENT_SETTING_ASK;
+
+  return setting;
+}
+
+void MediaStreamDevicePermissionContext::ResetPermission(
+    const GURL& requesting_origin,
+    const GURL& embedding_origin) {
+  CHECK(0) << "ResetPermission is not implemented";
+}
+
+void MediaStreamDevicePermissionContext::CancelPermissionRequest(
+    content::WebContents* web_contents,
+    const PermissionRequestID& id) {
+  CHECK(0) << "CancelPermissionRequest is not implemented";
+}