MediaDrm: Only apply Widevine security levels to the Widevine key system.

media/base/android/media_drm_bridge.cc

Index: media/base/android/media_drm_bridge.cc
diff --git a/media/base/android/media_drm_bridge.cc b/media/base/android/media_drm_bridge.cc
index a89522df7115e8426a6df794cf6d0323f6fd485f..ecac70483763e99f3c0a60f7794615a6d57a9a2f 100644
--- a/media/base/android/media_drm_bridge.cc
+++ b/media/base/android/media_drm_bridge.cc
@@ -298,6 +298,7 @@ bool MediaDrmBridge::IsAvailable() {
   return true;
 }
 
+// TODO(ddorwin): This is specific to Widevine. http://crbug.com/459400
 // static
 bool MediaDrmBridge::IsSecureDecoderRequired(SecurityLevel security_level) {
   DCHECK(IsAvailable());
@@ -305,20 +306,6 @@ bool MediaDrmBridge::IsSecureDecoderRequired(SecurityLevel security_level) {
 }
 
 // static
-bool MediaDrmBridge::IsSecurityLevelSupported(const std::string& key_system,
-                                              SecurityLevel security_level) {
-  if (!IsAvailable())
-    return false;
-
-  scoped_ptr<MediaDrmBridge> media_drm_bridge =
-      MediaDrmBridge::CreateWithoutSessionSupport(key_system);
-  if (!media_drm_bridge)
-    return false;
-
-  return media_drm_bridge->SetSecurityLevel(security_level);
-}
-
-// static
 std::vector<std::string> MediaDrmBridge::GetPlatformKeySystemNames() {
   return g_key_system_uuid_manager.Get().GetPlatformKeySystemNames();
 }
@@ -404,6 +391,13 @@ scoped_ptr<MediaDrmBridge> MediaDrmBridge::CreateWithoutSessionSupport(
 }
 
 bool MediaDrmBridge::SetSecurityLevel(SecurityLevel security_level) {
+  if (security_level != SECURITY_LEVEL_NONE &&
+      !std::equal(scheme_uuid_.begin(), scheme_uuid_.end(), kWidevineUuid)) {
+    NOTREACHED() << "Widevine security level " << security_level
+                 << "used with another key system";
+    return false;
+  }
+
   JNIEnv* env = AttachCurrentThread();
 
   std::string security_level_str = GetSecurityLevelString(security_level);
@@ -636,7 +630,12 @@ MediaDrmBridge::SecurityLevel MediaDrmBridge::GetSecurityLevel() {
 }
 
 bool MediaDrmBridge::IsProtectedSurfaceRequired() {
-  return IsSecureDecoderRequired(GetSecurityLevel());
+  // For Widevine, this depends on the security level.
+  if (std::equal(scheme_uuid_.begin(), scheme_uuid_.end(), kWidevineUuid))
+    return IsSecureDecoderRequired(GetSecurityLevel());
+
+  // For other key systems, assume true.
+  return true;
 }
 
 void MediaDrmBridge::ResetDeviceCredentials(