Added ToolTip support for CDB.

Make debugger tooltip API more general, have the engines check the
correct file type, figure out the expression and context from the text
editor.

Put common functionality in watchutils.cpp. In the CDB engine, check
whether a tooltip expression is a known variable within the stack frame
context. If so, retrieve via symbol group or dumpers. Cache by function
and expression.
Reviewed-by: hjk <qtc-committer@nokia.com>

src/plugins/debugger/cdb/cdbdebugengine_p.h

@@ -39,6 +39,7 @@
 
 #include <utils/consoleprocess.h>
 #include <QtCore/QSharedPointer>
+#include <QtCore/QMap>
 
 namespace Debugger {
 namespace Internal {
@@ -94,7 +95,9 @@ struct CdbComInterfaces
 };
 
 struct CdbDebugEnginePrivate
-{    
+{
+    typedef QMap<QString, QString> EditorToolTipCache;
+
     enum HandleBreakEventMode { // Special modes for break event handler.
         BreakEventHandle,
         BreakEventIgnoreOnce,
@@ -160,6 +163,8 @@ struct CdbDebugEnginePrivate
     DebuggerManager *m_debuggerManager;
     IDebuggerManagerAccessForEngines *m_debuggerManagerAccess;
     CdbStackTraceContext *m_currentStackTrace;
+    EditorToolTipCache m_editorToolTipCache;
+
     bool m_firstActivatedFrame;
 
     DebuggerStartMode m_mode;