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..afd9de53d9bb139f9e321c66e3dd06c0c8a21bfb 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);

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

Where is the black color of the text coming from?

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

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

We generally try not to duplicate complex logic like this because it leads to
broken edge cases. For example, a developer fixing a bug in paintDocumentMarkers
below might not know to fix paintTextMatchMarkerText too. Maybe this is an
exception but can you think of a way to modify paintDocumentMarkers() to work
instead?

+    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())