Display transparent text when it's being searched and selected.

Source/core/paint/InlineTextBoxPainter.h

 // Copyright 2014 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 InlineTextBoxPainter_h
 #define InlineTextBoxPainter_h
 
+#include "core/paint/TextPainter.h"

[pdr., 2015/07/21 05:59:46]

I think you can just forward declare this ("class TextPainter" below "class
LayoutTextCombine") instead of including another header.

 #include "core/style/ComputedStyleConstants.h"
 #include "platform/geometry/LayoutRect.h"
 
 namespace blink {
 
 struct CompositionUnderline;
 struct PaintInfo;
 
 class Color;
 class ComputedStyle;
 class DocumentMarker;
 class FloatPoint;
 class FloatRect;
 class Font;
 class GraphicsContext;
 class InlineTextBox;
 class LayoutPoint;
 class LayoutTextCombine;
 
 class InlineTextBoxPainter {
 public:
     InlineTextBoxPainter(InlineTextBox& inlineTextBox) : m_inlineTextBox(inlineTextBox) { }
 
     void paint(const PaintInfo&, const LayoutPoint&);
+    void paintTextMatchMarkerText(TextPainter, int, const ComputedStyle&);

[pdr., 2015/07/21 05:59:46]

TextPainter is a large class so we shouldn't pass it by value. For a large
object like TextPainter, we'd want to use "TextPainter&" here.

Unless the meaning is trivial (like TextPainter and ComputedStyle), we should
include a name for all variables. In this case, just change "int" to "int
length".

In general we shouldn't pass Painter classes around though, as they are meant to
be short-lived for simplicity. If you'd like, in a followup patch, we could add
"STACK_ALLOCATED();" and "WTF_MAKE_NONCOPYABLE(...)" to all of the painter
classes to enforce this.

     void paintDocumentMarkers(GraphicsContext*, const LayoutPoint& boxOrigin, const ComputedStyle&, const Font&, bool background);
     void paintDocumentMarker(GraphicsContext*, const LayoutPoint& boxOrigin, DocumentMarker*, const ComputedStyle&, const Font&, bool grammar);
     void paintTextMatchMarker(GraphicsContext*, const LayoutPoint& boxOrigin, DocumentMarker*, const ComputedStyle&, const Font&);
 
     static void removeFromTextBlobCache(InlineTextBox&);
 
 private:
     enum class PaintOptions { Normal, CombinedText };
 
     void paintCompositionBackgrounds(GraphicsContext*, const LayoutPoint& boxOrigin, const ComputedStyle&, const Font&, bool useCustomUnderlines);
     void paintSingleCompositionBackgroundRun(GraphicsContext*, const LayoutPoint& boxOrigin, const ComputedStyle&, const Font&, Color backgroundColor, int startPos, int endPos);
     template <PaintOptions>
     void paintSelection(GraphicsContext*, const LayoutRect& boxRect, const ComputedStyle&, const Font&, Color textColor, LayoutTextCombine* = nullptr);
     void paintDecoration(GraphicsContext*, const LayoutPoint& boxOrigin, TextDecoration);
     void paintCompositionUnderline(GraphicsContext*, const LayoutPoint& boxOrigin, const CompositionUnderline&);
     unsigned underlinePaintStart(const CompositionUnderline&);
     unsigned underlinePaintEnd(const CompositionUnderline&);
 
     InlineTextBox& m_inlineTextBox;
 };
 
 } // namespace blink
 
 #endif // InlineTextBoxPainter_h