media: Add External Clear Key content browser test on Android

components/cdm/renderer/external_clear_key_key_system_properties.h

+// Copyright 2016 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.
+
+#ifndef COMPONENTS_CDM_RENDERER_EXTERNAL_CLEAR_KEY_KEY_SYSTEM_PROPERTIES_H_
+#define COMPONENTS_CDM_RENDERER_EXTERNAL_CLEAR_KEY_KEY_SYSTEM_PROPERTIES_H_
+
+#include <string>
+
+#include "build/build_config.h"
+#include "media/base/key_system_properties.h"
+
+namespace cdm {
+
+#if defined(ENABLE_PEPPER_CDMS)
+static const char kExternalClearKeyPepperType[];
+#endif
+
+// KeySystemProperties implementation for external Clear Key key systems.
+class ExternalClearKeyProperties : public media::KeySystemProperties {
+ public:
+  explicit ExternalClearKeyProperties(const std::string& key_system_name);
+  ~ExternalClearKeyProperties() override;
+
+  std::string GetKeySystemName() const override;
+  bool IsSupportedInitDataType(
+      media::EmeInitDataType init_data_type) const override;
+  media::SupportedCodecs GetSupportedCodecs() const override;
+  media::EmeConfigRule GetRobustnessConfigRule(
+      media::EmeMediaType media_type,
+      const std::string& requested_robustness) const override;
+  media::EmeSessionTypeSupport GetPersistentLicenseSessionSupport()
+      const override;
+  media::EmeSessionTypeSupport GetPersistentReleaseMessageSessionSupport()
+      const override;
+  media::EmeFeatureSupport GetPersistentStateSupport() const override;
+  media::EmeFeatureSupport GetDistinctiveIdentifierSupport() const override;
+#if defined(ENABLE_PEPPER_CDMS)
+  std::string GetPepperType() const override;

[jrummell, 2016/08/24 20:36:52]

media::KeySystemProperties always specifies GetPepperType(). Shouldn't this be
defined, even if !ENABLE_PEPPER_CDMS? It looks like Widevine does this as well,
but all the calls aren't conditionally compiled in (although I guess the
assumption is that the properties won't be included if !ENABLE_PEPPER_CDMS).

[xhwang, 2016/08/24 23:31:03]

There's a default implementation for this where it'll return an empty string:

https://cs.chromium.org/chromium/src/media/base/key_system_properties.cc?rcl=...

The default implementation also has a nice DCHECK that this shouldn't be called
if ENABLE_PEPPER_CDMS is not defined.

+#endif
+
+ private:
+  const std::string key_system_name_;
+};
+
+}  // namespace cdm
+
+#endif  // COMPONENTS_CDM_RENDERER_EXTERNAL_CLEAR_KEY_KEY_SYSTEM_PROPERTIES_H_