Add debugging output for visual rects in PaintController.

third_party/WebKit/Source/platform/graphics/paint/DrawingDisplayItem.cpp

Index: third_party/WebKit/Source/platform/graphics/paint/DrawingDisplayItem.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/paint/DrawingDisplayItem.cpp b/third_party/WebKit/Source/platform/graphics/paint/DrawingDisplayItem.cpp
index 5ac24ee3d9f0882e3bc419cc11239a55d2096926..702a008538b88ebbd838c1a16ccba4df628eb9e5 100644
--- a/third_party/WebKit/Source/platform/graphics/paint/DrawingDisplayItem.cpp
+++ b/third_party/WebKit/Source/platform/graphics/paint/DrawingDisplayItem.cpp
@@ -44,7 +44,7 @@ void DrawingDisplayItem::dumpPropertiesAsDebugString(WTF::StringBuilder& stringB
 {
     DisplayItem::dumpPropertiesAsDebugString(stringBuilder);
     if (m_picture) {
-        stringBuilder.append(WTF::String::format(", rect: [%f,%f,%f,%f]",
+        stringBuilder.append(WTF::String::format(", rect: [%f,%f %fx%f]",

[wkorman, 2016/07/01 19:04:06]

Can remove WTF:: here in two places, also here and in PaintController, can
alternatively do:

rect: [%s]", m_picture->ToString().ascii().data())

Is that better? I'm not sure. I've grown to deeply loathe ascii().data().

             m_picture->cullRect().x(), m_picture->cullRect().y(),
             m_picture->cullRect().width(), m_picture->cullRect().height()));
     }