Update ColorFilterImageFilter & BlurImageFilter debugger strings

src/effects/SkBlurImageFilter.cpp

 /*
  * Copyright 2011 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmap.h"
 #include "SkBlurImageFilter.h"
 #include "SkColorPriv.h"
@@ skipping 273 matching lines @@
     return true;
 #else
     SkDEBUGFAIL("Should not call in GPU-less build");
     return false;
 #endif
 }
 
 #ifndef SK_IGNORE_TO_STRING
 void SkBlurImageFilter::toString(SkString* str) const {
     str->appendf("SkBlurImageFilter: (");
-    str->appendf("sigma: (%f, %f)", fSigma.fWidth, fSigma.fHeight);
-    str->append(")");
+    str->appendf("sigma: (%f, %f) input (", fSigma.fWidth, fSigma.fHeight);
+
+    if (this->getInput(0)) {
+        this->getInput(0)->toString(str);
+    }
+
+    str->append("))");
 }
 #endif