cc: Prevent float-cast-overflow in MapRectInternal.

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 <stddef.h>
 
 #include <algorithm>
 
 #include "base/trace_event/trace_event_argument.h"
 #include "base/values.h"
@@ skipping 318 matching lines @@
 
 gfx::Rect MapRectInternal(const FilterOperation& op,
                           const gfx::Rect& rect,
                           const SkMatrix& matrix,
                           SkImageFilter::MapDirection direction) {
   switch (op.type()) {
     case FilterOperation::BLUR: {
       SkVector spread = MapStdDeviation(op.amount(), matrix);
       float spread_x = std::abs(spread.x());
       float spread_y = std::abs(spread.y());
-      gfx::Rect result = rect;
+      gfx::RectF result(rect);
       result.Inset(-spread_x, -spread_y, -spread_x, -spread_y);
-      return result;
+      return gfx::ToEnclosingRect(result);
     }
     case FilterOperation::DROP_SHADOW: {
       SkVector spread = MapStdDeviation(op.amount(), matrix);
       float spread_x = std::abs(spread.x());
       float spread_y = std::abs(spread.y());
       gfx::RectF result(rect);
       result.Inset(-spread_x, -spread_y, -spread_x, -spread_y);
 
       gfx::Point drop_shadow_offset = op.drop_shadow_offset();
       SkVector mapped_drop_shadow_offset;
@@ skipping 25 matching lines @@
                          SkImageFilter::kForward_MapDirection);
 }
 
 gfx::Rect FilterOperation::MapRectReverse(const gfx::Rect& rect,
                                           const SkMatrix& matrix) const {
   return MapRectInternal(*this, rect, matrix,
                          SkImageFilter::kReverse_MapDirection);
 }
 
 }  // namespace cc