CompilationDbProjectManager: Sanitize project parsing

The parsing code used to access all kinds of stuff (e.g. the project
tree and the toolchain manager) from the non-UI thread, which is not
allowed.

Fixes: QTCREATORBUG-22420
Change-Id: I4be47919d7e543376d31826dd380f66f4e060458
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@qt.io>

src/plugins/compilationdatabaseprojectmanager/compilationdatabaseutils.h

@@ -28,7 +28,9 @@
 #include "compilationdatabaseconstants.h"
 
 #include <cpptools/cppprojectfile.h>
+#include <utils/fileutils.h>
 
+#include <QHash>
 #include <QStringList>
 
 namespace ProjectExplorer {
@@ -37,6 +39,23 @@ class Macro;
 }
 
 namespace CompilationDatabaseProjectManager {
+namespace Internal {
+
+class DbEntry {
+public:
+    QStringList flags;
+    Utils::FileName fileName;
+    QString workingDir;
+};
+
+class DbContents {
+public:
+    std::vector<DbEntry> entries;
+    QString extraFileName;
+    QStringList extras;
+};
+
+using MimeBinaryCache = QHash<QString, bool>;
 
 QStringList filterFromFileName(const QStringList &flags, QString baseName);
 
@@ -50,4 +69,5 @@ void filteredFlags(const QString &fileName,
 
 QStringList splitCommandLine(QString commandLine, QSet<QString> &flagsCache);
 
+} // namespace Internal
 } // namespace CompilationDatabaseProjectManager