Add CefRegisterWidevineCdm function and remove component updater support (issue #2009)

Mac: Check in widevinecdmadapter.plugin binary until Widevine GN build errors are resolved (https://crbug.com/626436).

libcef/browser/web_plugin_impl.cc

@@ -3,8 +3,10 @@
 // can be found in the LICENSE file.
 
 #include "libcef/browser/web_plugin_impl.h"
+
 #include "libcef/browser/context.h"
 #include "libcef/browser/thread_util.h"
+#include "libcef/common/widevine_loader.h"
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
@@ -28,6 +30,22 @@ void PluginsCallbackImpl(
   }
 }
 
+#if !(defined(WIDEVINE_CDM_AVAILABLE) && defined(ENABLE_PEPPER_CDMS)) || \
+    defined(OS_LINUX)
+
+void DeliverWidevineCdmError(const std::string& error_message,
+                             CefRefPtr<CefRegisterCdmCallback> callback) {
+  LOG(ERROR) << error_message;
+  if (callback.get()) {
+    CEF_POST_TASK(CEF_UIT,
+        base::Bind(&CefRegisterCdmCallback::OnCdmRegistrationComplete,
+                   callback.get(), CEF_CDM_REGISTRATION_ERROR_NOT_SUPPORTED,
+                   error_message));
+  }
+}
+
+#endif
+
 }  // namespace
 
 
@@ -150,3 +168,24 @@ void CefIsWebPluginUnstable(
     CEF_POST_TASK(CEF_IOT, base::Bind(CefIsWebPluginUnstable, path, callback));
   }
 }
+
+void CefRegisterWidevineCdm(const CefString& path,
+                            CefRefPtr<CefRegisterCdmCallback> callback) {
+#if defined(WIDEVINE_CDM_AVAILABLE) && defined(ENABLE_PEPPER_CDMS)
+#if defined(OS_LINUX)
+  // Enforce the requirement that CefRegisterWidevineCdm() is called before
+  // CefInitialize() on Linux. See comments in
+  // CefWidevineLoader::AddPepperPlugins for details.
+  if (CONTEXT_STATE_VALID()) {
+    DeliverWidevineCdmError(
+        "Widevine registration is not supported after context initialization",
+        callback);
+    return;
+  }
+#endif  // defined(OS_LINUX)
+
+  CefWidevineLoader::GetInstance()->LoadWidevineCdm(path, callback);
+#else
+  DeliverWidevineCdmError("Widevine registration is not supported", callback);
+#endif  // defined(WIDEVINE_CDM_AVAILABLE) && defined(ENABLE_PEPPER_CDMS)
+}