cc: refactor of MathUtil::AddToTracedValue

cc/output/filter_operation.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <algorithm>
 
 #include "base/debug/trace_event_argument.h"
 #include "base/values.h"
 #include "cc/base/math_util.h"
 #include "cc/output/filter_operation.h"
@@ skipping 254 matching lines @@
     case FilterOperation::INVERT:
     case FilterOperation::BRIGHTNESS:
     case FilterOperation::CONTRAST:
     case FilterOperation::OPACITY:
     case FilterOperation::BLUR:
     case FilterOperation::SATURATING_BRIGHTNESS:
       value->SetDouble("amount", amount_);
       break;
     case FilterOperation::DROP_SHADOW:
       value->SetDouble("std_deviation", amount_);
-      value->BeginArray("offset");
-      MathUtil::AddToTracedValue(drop_shadow_offset_, value);
-      value->EndArray();
+      MathUtil::AddToTracedValue("offset", drop_shadow_offset_, value);
       value->SetInteger("color", drop_shadow_color_);
       break;
     case FilterOperation::COLOR_MATRIX: {
       value->BeginArray("matrix");
       for (size_t i = 0; i < arraysize(matrix_); ++i)
         value->AppendDouble(matrix_[i]);
       value->EndArray();
       break;
     }
     case FilterOperation::ZOOM:
@@ skipping 23 matching lines @@
           value->AppendInteger(it.rect().width());
           value->AppendInteger(it.rect().height());
         }
         value->EndArray();
       }
       break;
   }
 }
 
 }  // namespace cc