Make the debugger left panel resizable.

debugger/QT/SkDebuggerGUI.h

Index: debugger/QT/SkDebuggerGUI.h
diff --git a/debugger/QT/SkDebuggerGUI.h b/debugger/QT/SkDebuggerGUI.h
index a478428505c096887fe39e24141af8325956a9bf..cdda861acb4eddaa9fec7f971c129511c342d8d5 100644
--- a/debugger/QT/SkDebuggerGUI.h
+++ b/debugger/QT/SkDebuggerGUI.h
@@ -28,6 +28,7 @@
 #include <QtGui/QListView>
 #include <QtGui/QListWidget>
 #include <QtGui/QMainWindow>
+#include <QtGui/QSplitter>
 #include <QtGui/QStatusBar>
 #include <QtGui/QToolBar>
 #include <QtGui/QVBoxLayout>
@@ -234,7 +235,7 @@ private slots:
     void toggleFilter(QString string);
 
 private:
-    QWidget fCentralWidget;
+    QSplitter fCentralSplitter;
     QStatusBar fStatusBar;
     QToolBar fToolBar;
 
@@ -266,8 +267,8 @@ private:
     QWidget fSpacer;
     QComboBox fFilter;
 
-    QHBoxLayout fContainerLayout;
-    QVBoxLayout fLeftColumnLayout;
+    QSplitter fLeftColumnSplitter;
+    QWidget fMainAndRightColumnWidget;
     QVBoxLayout fMainAndRightColumnLayout;
     QHBoxLayout fCanvasSettingsAndImageLayout;
     QVBoxLayout fSettingsAndImageLayout;