media: Add External Clear Key content browser test on Android

content/shell/renderer/shell_content_renderer_client.cc

Index: content/shell/renderer/shell_content_renderer_client.cc
diff --git a/content/shell/renderer/shell_content_renderer_client.cc b/content/shell/renderer/shell_content_renderer_client.cc
index 9d9b88a67b26a5644092fc2e3e687beb3ae6cd97..d36df7debda0fb74604bbdb23ef30420e6e98755 100644
--- a/content/shell/renderer/shell_content_renderer_client.cc
+++ b/content/shell/renderer/shell_content_renderer_client.cc
@@ -10,6 +10,7 @@
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/macros.h"
+#include "components/cdm/renderer/external_clear_key_key_system_properties.h"
 #include "components/web_cache/renderer/web_cache_impl.h"
 #include "content/public/test/test_mojo_service.mojom.h"
 #include "content/shell/common/shell_switches.h"
@@ -129,4 +130,14 @@ void ShellContentRendererClient::ExposeInterfacesToBrowser(
       base::Bind(&CreateTestMojoService));
 }
 
+#if defined(OS_ANDROID)
+void ShellContentRendererClient::AddSupportedKeySystems(
+    std::vector<std::unique_ptr<media::KeySystemProperties>>* key_systems) {
+  static const char kExternalClearKeyKeySystem[] =
+      "org.chromium.externalclearkey";
+  key_systems->emplace_back(
+      new cdm::ExternalClearKeyProperties(kExternalClearKeyKeySystem));
+}
+#endif
+
 }  // namespace content