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

Source/core/paint/InlineTextBoxPainter.cpp

Index: Source/core/paint/InlineTextBoxPainter.cpp
diff --git a/Source/core/paint/InlineTextBoxPainter.cpp b/Source/core/paint/InlineTextBoxPainter.cpp
index a7503c4527704aaa22ce931760ab6fc094b4e0ec..c17a8fc8cb6c5fe34566782b3f379729862fc9f9 100644
--- a/Source/core/paint/InlineTextBoxPainter.cpp
+++ b/Source/core/paint/InlineTextBoxPainter.cpp
@@ -218,6 +218,10 @@ void InlineTextBoxPainter::paint(const PaintInfo& paintInfo, const LayoutPoint&
         if (textBlobIsCacheable)
             cachedTextBlob = addToTextBlobCache(m_inlineTextBox);
         textPainter.paint(startOffset, endOffset, length, textStyle, cachedTextBlob);
+
+        // Paint the text with color:transparent here in Find In Page Scenario.
+        if (styleToUse.visitedDependentColor(CSSPropertyColor) == Color::transparent)
+            paintTextMatchMarkerText(textPainter, length, styleToUse);
     }
 
     if ((paintSelectedTextOnly || paintSelectedTextSeparately) && selectionStart < selectionEnd) {
@@ -305,6 +309,24 @@ void InlineTextBoxPainter::paintSingleCompositionBackgroundRun(GraphicsContext*
     context->drawHighlightForText(font, m_inlineTextBox.constructTextRun(style, font), localOrigin, selHeight, backgroundColor, sPos, ePos);
 }
 
+void InlineTextBoxPainter::paintTextMatchMarkerText(TextPainter textPainter,  int length, const ComputedStyle& style)

[pdr., 2015/07/06 22:09:16]

extra spaces around int length

[Sk.kumar, 2015/07/07 12:45:02]

Done.

+{
+    if (!m_inlineTextBox.layoutObject().node())
+        return;
+
+    TextPainter::Style textStyle = TextPainter::textPaintingStyle(m_inlineTextBox.layoutObject(), style, true, false);

[pdr., 2015/07/06 22:09:16]

We shouldn't add all of this code. Can you modify the existing marker paint code
to detect the transparent color and switch to another color?

[Sk.kumar, 2015/07/07 12:45:02]

This is being done to maintain the flow of Paint.
1st - background and then 2nd- foreground.
Also, at the point when the marker paint is executed, we don't have the
textpainter, so first we have to create one and then use.
Currently, we already have the textpainter at this point. So, it's easier to go
through DocumentMarkerVector of type TextMatch and paint the text with
color:transparent.
Please let me know your opinion on this. 

+    DocumentMarkerVector markers = m_inlineTextBox.layoutObject().document().markers().markersFor(m_inlineTextBox.layoutObject().node());
+    DocumentMarkerVector::const_iterator markerIt = markers.begin();
+    for ( ; markerIt != markers.end(); ++markerIt) {
+        DocumentMarker* marker = *markerIt;
+        if (marker->type() == DocumentMarker::TextMatch) {
+            int sPos = std::max(marker->startOffset() - m_inlineTextBox.start(), (unsigned)0);
+            int ePos = std::min(marker->endOffset() - m_inlineTextBox.start(), m_inlineTextBox.len());
+            textPainter.paint(sPos, ePos, length, textStyle, 0);
+        }
+    }
+}
+
 void InlineTextBoxPainter::paintDocumentMarkers(GraphicsContext* pt, const LayoutPoint& boxOrigin, const ComputedStyle& style, const Font& font, bool background)
 {
     if (!m_inlineTextBox.layoutObject().node())