Handle createCDM() when frame destroyed

media/blink/webcontentdecryptionmoduleaccess_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 "webcontentdecryptionmoduleaccess_impl.h"

[xhwang, 2015/02/03 18:45:48]

full path relative to src/

[jrummell, 2015/02/03 20:01:14]

Done.

 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/message_loop/message_loop_proxy.h"
-#include "third_party/WebKit/public/platform/WebContentDecryptionModuleResult.h"
-#include "webcontentdecryptionmodule_impl.h"
+#include "webencryptedmediaclient_impl.h"

[xhwang, 2015/02/03 18:45:49]

full path relative to src/

[jrummell, 2015/02/03 20:01:13]

Done.

 
 namespace media {
 
 // The caller owns the created cdm (passed back using |result|).
-static void CreateCdm(CdmFactory* cdm_factory,
+static void CreateCdm(base::WeakPtr<WebEncryptedMediaClientImpl> client,

[xhwang, 2015/02/03 18:45:49]

Add include for weak ptr.

[jrummell, 2015/02/03 20:01:14]

Already in the .h file.

                       blink::WebSecurityOrigin security_origin,
                       blink::WebString key_system,
                       blink::WebContentDecryptionModuleResult result) {

[xhwang, 2015/02/03 18:45:49]

Pass parameters by const-ref where possible?

[jrummell, 2015/02/03 20:01:14]

Done.

-  WebContentDecryptionModuleImpl::Create(cdm_factory, security_origin,
-                                         key_system, result);
+  // If |client| is gone (due to the frame getting destroyed), it is
+  // impossible to create the CDM, so fail.
+  if (client.get() == nullptr) {

[xhwang, 2015/02/03 18:45:48]

WeakPtr is Testable, no need to use get() and compare to nullptr:

See:
https://code.google.com/p/chromium/codesearch#chromium/src/base/memory/weak_p...

[jrummell, 2015/02/03 20:01:13]

Done.

+    result.completeWithError(
+        blink::WebContentDecryptionModuleExceptionInvalidStateError, 0,
+        "Failed to create CDM.");
+    return;
+  }
+
+  client->CreateCdm(security_origin, key_system, result);
 }
 
 WebContentDecryptionModuleAccessImpl*
 WebContentDecryptionModuleAccessImpl::Create(
     const blink::WebString& key_system,
     const blink::WebMediaKeySystemConfiguration& configuration,
     const blink::WebSecurityOrigin& security_origin,
-    CdmFactory* cdm_factory) {
+    base::WeakPtr<WebEncryptedMediaClientImpl> client) {

[xhwang, 2015/02/03 18:45:48]

ditto

[jrummell, 2015/02/03 20:01:13]

Done.

   return new WebContentDecryptionModuleAccessImpl(key_system, configuration,
-                                                  security_origin, cdm_factory);
+                                                  security_origin, client);
 }
 
 WebContentDecryptionModuleAccessImpl::WebContentDecryptionModuleAccessImpl(
     const blink::WebString& key_system,
     const blink::WebMediaKeySystemConfiguration& configuration,
     const blink::WebSecurityOrigin& security_origin,
-    CdmFactory* cdm_factory)
+    base::WeakPtr<WebEncryptedMediaClientImpl> client)

[xhwang, 2015/02/03 18:45:49]

ditto

[jrummell, 2015/02/03 20:01:14]

Done.

     : key_system_(key_system),
       configuration_(configuration),
       security_origin_(security_origin),
-      cdm_factory_(cdm_factory) {
+      client_(client) {
 }
 
 WebContentDecryptionModuleAccessImpl::~WebContentDecryptionModuleAccessImpl() {
 }
 
 blink::WebMediaKeySystemConfiguration
 WebContentDecryptionModuleAccessImpl::getConfiguration() {
   return configuration_;
 }
 
 void WebContentDecryptionModuleAccessImpl::createContentDecryptionModule(
     blink::WebContentDecryptionModuleResult result) {
   // This method needs to run asynchronously, as it may need to load the CDM.
   // As this object's lifetime is controlled by MediaKeySystemAccess on the
   // blink side, copy all values needed by CreateCdm() in case the blink object
   // gets garbage-collected.
   base::MessageLoopProxy::current()->PostTask(
-      FROM_HERE, base::Bind(&CreateCdm, cdm_factory_, security_origin_,
-                            key_system_, result));
+      FROM_HERE,
+      base::Bind(&CreateCdm, client_, security_origin_, key_system_, result));
 }
 
 }  // namespace media