Adding backgroundColor to WebCompositionUnderline and using it for InlineTextBox drawing.

Source/core/editing/CompositionUnderlineRangeFilter.cpp

Index: Source/core/editing/CompositionUnderlineRangeFilter.cpp
diff --git a/Source/core/editing/CompositionUnderlineRangeFilter.cpp b/Source/core/editing/CompositionUnderlineRangeFilter.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..cb532ba45f1e2ecd5cb1874bc75c5d250c31fbfa
--- /dev/null
+++ b/Source/core/editing/CompositionUnderlineRangeFilter.cpp
@@ -0,0 +1,35 @@
+// 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.
+
+#include "config.h"
+#include "core/editing/CompositionUnderlineRangeFilter.h"
+
+namespace WebCore {
+
+int CompositionUnderlineRangeFilter::seekValidIndex(int index)
+{
+    if (index < 0)
+        return ConstIterator::END;
+
+    size_t numUnderlines = m_underlines.size();
+    while (static_cast<size_t>(index) < numUnderlines) {
+        const CompositionUnderline& underline = m_underlines[index];
+
+        if (underline.endOffset <= m_indexLo) {
+            // underline is completely before interval. This may be an underline that appear

[huangs, 2014/06/06 23:38:32]

Remove comments about "runs".

[huangs, 2014/06/09 06:07:13]

Done.

+            // before the first run, or may be a underline within current run that got
+            // skipped due to truncation.
+            ++index;
+        } else if (underline.startOffset <= m_indexHi) {
+            // underline intersects range. Process it.
+            return index;
+        } else {
+            // underline is completely after this run, bail.
+            break;
+        }
+    }
+    return ConstIterator::END;
+}
+
+} // namespace WebCore