media: Add MediaPermission interface and MediaPermissionDispatcher.

media/blink/webencryptedmediaclient_impl.cc

Index: media/blink/webencryptedmediaclient_impl.cc
diff --git a/media/blink/webencryptedmediaclient_impl.cc b/media/blink/webencryptedmediaclient_impl.cc
index af7b7f487a99cc44cf5254257835e1d4c8fbdfe9..755bbe29ee11620a33670cfbb3fd88ababde7de9 100644
--- a/media/blink/webencryptedmediaclient_impl.cc
+++ b/media/blink/webencryptedmediaclient_impl.cc
@@ -4,10 +4,12 @@
 
 #include "webencryptedmediaclient_impl.h"
 
+#include "base/bind.h"
 #include "base/logging.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "media/base/key_systems.h"
+#include "media/base/media_permission.h"
 #include "net/base/mime_util.h"
 #include "third_party/WebKit/public/platform/WebEncryptedMediaRequest.h"
 #include "third_party/WebKit/public/platform/WebMediaKeySystemConfiguration.h"
@@ -131,17 +133,27 @@ static bool GetSupportedConfiguration(
 }
 
 WebEncryptedMediaClientImpl::WebEncryptedMediaClientImpl(
-    scoped_ptr<CdmFactory> cdm_factory)
-    : cdm_factory_(cdm_factory.Pass()) {
+    scoped_ptr<CdmFactory> cdm_factory,
+    MediaPermission* media_permission)
+    : cdm_factory_(cdm_factory.Pass()), media_permission_(media_permission) {
 }
 
 WebEncryptedMediaClientImpl::~WebEncryptedMediaClientImpl() {
 }
 
+static void OnPermissionStatus(bool granted) {
+  DVLOG(2) << __FUNCTION__ << ": " << granted;
+}
+
 void WebEncryptedMediaClientImpl::requestMediaKeySystemAccess(
     blink::WebEncryptedMediaRequest request) {
   // TODO(jrummell): This should be asynchronous.
 
+  GURL security_origin_as_gurl(request.securityOrigin().toString());
+  media_permission_->HasPermission(MediaPermission::PROTECTED_MEDIA_IDENTIFIER,
+                                   security_origin_as_gurl,
+                                   base::Bind(&OnPermissionStatus));

[xhwang, 2015/01/22 23:40:54]

FYI: This is how I test this CL with
LayoutTests/media/encrypted-media/encrypted-media-requestmediakeysystemaccess.html
test.

+
   // Continued from requestMediaKeySystemAccess(), step 7, from
   // https://w3c.github.io/encrypted-media/#requestmediakeysystemaccess
   //