media: CdmFactory creates CDM (MediaKeys) asynchronously.

media/blink/webcontentdecryptionmodule_impl.cc

 // Copyright 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 "webcontentdecryptionmodule_impl.h"
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/numerics/safe_conversions.h"
@@ skipping 44 matching lines @@
 
   // If unique security origin, don't try to create the CDM.
   if (security_origin.isUnique() || security_origin.toString() == "null") {
     result.completeWithError(
         blink::WebContentDecryptionModuleExceptionNotSupportedError, 0,
         "CDM use not allowed for unique security origin.");
     return;
   }
 
   GURL security_origin_as_gurl(security_origin.toString());
+
+  // CdmSessionAdapter::CreateCdm() will keep a reference to |adapter|. Then
+  // if WebContentDecryptionModuleImpl is successfully created (returned in
+  // |result|), it will keep a reference to |adapter|. Otherwise, |adapter| will
+  // be destructed.
   scoped_refptr<CdmSessionAdapter> adapter(new CdmSessionAdapter());
-
-  // TODO(jrummell): Pass WebContentDecryptionModuleResult (or similar) to
-  // Initialize() so that more specific errors can be reported.
-  if (!adapter->Initialize(cdm_factory, key_system_ascii,
-                           allow_distinctive_identifier,
-                           allow_persistent_state, security_origin_as_gurl)) {
-    result.completeWithError(
-        blink::WebContentDecryptionModuleExceptionNotSupportedError, 0,
-        "Failed to initialize CDM.");
-    return;
-  }
-
-  result.completeWithContentDecryptionModule(
-      new WebContentDecryptionModuleImpl(adapter));
+  adapter->CreateCdm(cdm_factory, key_system_ascii,
+                     allow_distinctive_identifier, allow_persistent_state,
+                     security_origin_as_gurl, result);
 }
 
 WebContentDecryptionModuleImpl::WebContentDecryptionModuleImpl(
     scoped_refptr<CdmSessionAdapter> adapter)
     : adapter_(adapter) {
 }
 
 WebContentDecryptionModuleImpl::~WebContentDecryptionModuleImpl() {
 }
 
@@ skipping 13 matching lines @@
       base::saturated_cast<int>(server_certificate_length),
       scoped_ptr<SimpleCdmPromise>(
           new CdmResultPromise<>(result, std::string())));
 }
 
 CdmContext* WebContentDecryptionModuleImpl::GetCdmContext() {
   return adapter_->GetCdmContext();
 }
 
 }  // namespace media