Added print out of SkShader information to debugger

https://codereview.appspot.com/7105045/



git-svn-id: http://skia.googlecode.com/svn/trunk@7201 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/effects/SkTransparentShader.cpp b/src/effects/SkTransparentShader.cpp
index 28b075f..2c7172f 100644
--- a/src/effects/SkTransparentShader.cpp
+++ b/src/effects/SkTransparentShader.cpp
@@ -9,6 +9,7 @@
 
 #include "SkTransparentShader.h"
 #include "SkColorPriv.h"
+#include "SkString.h"
 
 bool SkTransparentShader::setContext(const SkBitmap& device,
                                      const SkPaint& paint,
@@ -125,3 +126,13 @@
         memcpy(span, src, count << 1);
     }
 }
+
+#ifdef SK_DEVELOPER
+void SkTransparentShader::toString(SkString* str) const {
+    str->append("SkTransparentShader: (");
+    
+    this->INHERITED::toString(str);
+
+    str->append(")");
+}
+#endif