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

Source/core/paint/InlineTextBoxPainter.h

Index: Source/core/paint/InlineTextBoxPainter.h
diff --git a/Source/core/paint/InlineTextBoxPainter.h b/Source/core/paint/InlineTextBoxPainter.h
index 5b8afb638c4ed1019c0e558aea3aebc7350bdb64..81337086948736327b03af625fb52a50410777ff 100644
--- a/Source/core/paint/InlineTextBoxPainter.h
+++ b/Source/core/paint/InlineTextBoxPainter.h
@@ -5,6 +5,7 @@
 #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"
 
@@ -29,6 +30,7 @@ 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&);