Adds media license nodes to cookie tree model and cookies view.

storage/browser/fileapi/plugin_private_file_system_backend.cc

Index: storage/browser/fileapi/plugin_private_file_system_backend.cc
diff --git a/storage/browser/fileapi/plugin_private_file_system_backend.cc b/storage/browser/fileapi/plugin_private_file_system_backend.cc
index 06e9aefb3f1f49a0db1f66b796b502854e998cfb..323c90f9b28bf9d382343533becdbd12a1387dd3 100644
--- a/storage/browser/fileapi/plugin_private_file_system_backend.cc
+++ b/storage/browser/fileapi/plugin_private_file_system_backend.cc
@@ -266,8 +266,61 @@ int64_t PluginPrivateFileSystemBackend::GetOriginUsageOnFileTaskRunner(
     FileSystemContext* context,
     const GURL& origin_url,
     FileSystemType type) {
-  // We don't track usage on this filesystem.
-  return 0;
+  DCHECK(file_task_runner_->RunsTasksOnCurrentThread());
+
+  if (!CanHandleType(type))
+    return 0;
+
+  int64_t total_size;
+  base::Time last_modified_time;
+  GetOriginDetailsOnFileTaskRunner(context, origin_url, &total_size,
+                                   &last_modified_time);
+  return total_size;
+}
+
+void PluginPrivateFileSystemBackend::GetOriginDetailsOnFileTaskRunner(
+    FileSystemContext* context,
+    const GURL& origin_url,
+    int64_t* total_size,
+    base::Time* last_modified_time) {
+  DCHECK(file_task_runner_->RunsTasksOnCurrentThread());
+
+  *total_size = 0;
+  *last_modified_time = base::Time::UnixEpoch();
+  std::string fsid =
+      storage::IsolatedContext::GetInstance()->RegisterFileSystemForVirtualPath(
+          storage::kFileSystemTypePluginPrivate, "pluginprivate",
+          base::FilePath());
+  DCHECK(storage::ValidateIsolatedFileSystemId(fsid));
+
+  std::string root = storage::GetIsolatedFileSystemRootURIString(
+      origin_url, fsid, "pluginprivate");
+
+  std::unique_ptr<FileSystemOperationContext> operation_context(
+      new FileSystemOperationContext(context));
+
+  std::vector<std::string> supported_plugins = {
+      "application_x-ppapi-widevine-cdm",  // Widevine
+      "application_x-ppapi-clearkey-cdm",  // ClearKey

[nhiroki, 2016/09/30 08:34:19]

I'd prefer to avoid widevine-specific code from the fileapi component as much as
possible. Could we replace these hard-coded strings with collecting supported
plugins from directory names like plugin_private_storage_helper.cc?

[jrummell, 2016/10/03 19:05:47]

Done.

+  };
+
+  for (const auto& plugin : supported_plugins) {
+    if (OpenFileSystemOnFileTaskRunner(
+            obfuscated_file_util(), plugin_map_, origin_url, fsid, plugin,
+            storage::OPEN_FILE_SYSTEM_FAIL_IF_NONEXISTENT) ==
+        base::File::FILE_OK) {

[nhiroki, 2016/09/30 08:34:19]

nit: Early-continue could be more readable because it can reduce the nest level:

if (OpenFSOnFileTaskRunner() != FILE_OK)
  continue;

[jrummell, 2016/10/03 19:05:47]

Done.

+      std::unique_ptr<FileSystemFileUtil::AbstractFileEnumerator> enumerator(
+          obfuscated_file_util()->CreateFileEnumerator(
+              operation_context.get(), context->CrackURL(GURL(root)), true));
+
+      base::FilePath current;
+      while (!(current = enumerator->Next()).empty()) {
+        *total_size += enumerator->Size();
+        if (enumerator->LastModifiedTime() > *last_modified_time)
+          *last_modified_time = enumerator->LastModifiedTime();
+      }
+    }
+  }
 }
 
 scoped_refptr<QuotaReservation>