Added toString to SkXfermode-derived classes (for debugger) 

https://codereview.appspot.com/7139058/



git-svn-id: http://skia.googlecode.com/svn/trunk@7308 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/debugger/SkDrawCommand.cpp b/debugger/SkDrawCommand.cpp
index c017f44..a2459b3 100644
--- a/debugger/SkDrawCommand.cpp
+++ b/debugger/SkDrawCommand.cpp
@@ -164,6 +164,9 @@
     this->fInfo.push(SkObjectParser::BitmapToString(bitmap));
     this->fInfo.push(SkObjectParser::ScalarToString(left, "SkScalar left: "));
     this->fInfo.push(SkObjectParser::ScalarToString(top, "SkScalar top: "));
+    if (NULL != paint) {
+        this->fInfo.push(SkObjectParser::PaintToString(*paint));
+    }
 }
 
 void DrawBitmap::execute(SkCanvas* canvas) {
@@ -184,7 +187,9 @@
 
     this->fInfo.push(SkObjectParser::BitmapToString(bitmap));
     this->fInfo.push(SkObjectParser::MatrixToString(matrix));
-    if (paint) this->fInfo.push(SkObjectParser::PaintToString(*paint));
+    if (NULL != paint) {
+        this->fInfo.push(SkObjectParser::PaintToString(*paint));
+    }
 }
 
 void DrawBitmapMatrix::execute(SkCanvas* canvas) {
@@ -207,7 +212,9 @@
     this->fInfo.push(SkObjectParser::BitmapToString(bitmap));
     this->fInfo.push(SkObjectParser::IRectToString(center));
     this->fInfo.push(SkObjectParser::RectToString(dst, "Dst: "));
-    if (paint) this->fInfo.push(SkObjectParser::PaintToString(*paint));
+    if (NULL != paint) {
+        this->fInfo.push(SkObjectParser::PaintToString(*paint));
+    }
 }
 
 void DrawBitmapNine::execute(SkCanvas* canvas) {
@@ -228,9 +235,13 @@
     this->fResizedBitmap = resizedBitmap;
 
     this->fInfo.push(SkObjectParser::BitmapToString(bitmap));
-    if (src) this->fInfo.push(SkObjectParser::RectToString(*src, "Src: "));
+    if (NULL != src) {
+        this->fInfo.push(SkObjectParser::RectToString(*src, "Src: "));
+    }
     this->fInfo.push(SkObjectParser::RectToString(dst, "Dst: "));
-    if (paint) this->fInfo.push(SkObjectParser::PaintToString(*paint));
+    if (NULL != paint) {
+        this->fInfo.push(SkObjectParser::PaintToString(*paint));
+    }
 }
 
 void DrawBitmapRect::execute(SkCanvas* canvas) {