Add getDrawCommandAt and setDrawCommandAt to SkDebugCanvas

debugger/SkDebugCanvas.cpp

Index: debugger/SkDebugCanvas.cpp
===================================================================
--- debugger/SkDebugCanvas.cpp	(revision 8452)
+++ debugger/SkDebugCanvas.cpp	(working copy)
@@ -207,11 +207,23 @@
     fIndex = index;
 }
 
+void SkDebugCanvas::deleteDrawCommandAt(int index) {
+    SkASSERT(index < fCommandVector.count());
+    delete fCommandVector[index];
+    fCommandVector.remove(index);
+}
+
 SkDrawCommand* SkDebugCanvas::getDrawCommandAt(int index) {
     SkASSERT(index < fCommandVector.count());
     return fCommandVector[index];
 }
 
+void SkDebugCanvas::setDrawCommandAt(int index, SkDrawCommand* command) {
+    SkASSERT(index < fCommandVector.count());
+    delete fCommandVector[index];
+    fCommandVector[index] = command;
+}
+
 SkTDArray<SkString*>* SkDebugCanvas::getCommandInfo(int index) {
     SkASSERT(index < fCommandVector.count());
     return fCommandVector[index]->Info();