Reduce copying of local data structures in GeometryMapper and PaintLayerClipper.

third_party/WebKit/Source/platform/graphics/paint/FloatClipRect.h

 // Copyright 2017 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.
 
 #ifndef FloatClipRect_h
 #define FloatClipRect_h
 
 #include "platform/geometry/FloatRect.h"
 #include "platform/geometry/LayoutRect.h"
 #include "wtf/Allocator.h"
 
 namespace blink {
 
 class PLATFORM_EXPORT FloatClipRect {
   USING_FAST_MALLOC(FloatClipRect);
 
  public:
   FloatClipRect()
       : m_rect(FloatRect(LayoutRect::infiniteIntRect())),
         m_hasRadius(false),
         m_isInfinite(true) {}
 
-  FloatClipRect(const FloatRect& rect)
+  explicit FloatClipRect(const FloatRect& rect)
       : m_rect(rect), m_hasRadius(false), m_isInfinite(false) {}
 
   const FloatRect& rect() const { return m_rect; }
 
   void intersect(const FloatRect& other) {
     if (m_isInfinite) {
       m_rect = other;
       m_isInfinite = false;
     } else {
       m_rect.intersect(other);
@@ skipping 29 matching lines @@
   if (a.isInfinite() && b.isInfinite())
     return true;
   if (!a.isInfinite() && !b.isInfinite())
     return a.rect() == b.rect() && a.hasRadius() == b.hasRadius();
   return false;
 }
 
 }  // namespace blink
 
 #endif  // FloatClipRect_h