[S.P.] Add drawing recorder for FrameSetPainter

Source/core/paint/FrameSetPainter.cpp

Index: Source/core/paint/FrameSetPainter.cpp
diff --git a/Source/core/paint/FrameSetPainter.cpp b/Source/core/paint/FrameSetPainter.cpp
index 07e92c2fb91c56b4a18f7fd724fd2d7853feaf66..3a6bc5370fe8f099beeb7a27c30812414d7af0a1 100644
--- a/Source/core/paint/FrameSetPainter.cpp
+++ b/Source/core/paint/FrameSetPainter.cpp
@@ -8,6 +8,7 @@
 #include "core/html/HTMLFrameSetElement.h"
 #include "core/layout/PaintInfo.h"
 #include "core/paint/GraphicsContextAnnotator.h"
+#include "core/paint/RenderDrawingRecorder.h"
 #include "core/rendering/RenderFrameSet.h"
 
 namespace blink {
@@ -34,6 +35,10 @@ void FrameSetPainter::paintColumnBorder(const PaintInfo& paintInfo, const IntRec
 
     // FIXME: We should do something clever when borders from distinct framesets meet at a join.
 
+    RenderDrawingRecorder renderDrawingRecorder(paintInfo.context, m_renderFrameSet, paintInfo.phase, borderRect);

[jbroman, 2015/02/26 00:22:35]

For future reference, this will produce lots of display items with the same ID,
which the merge/caching algorithm won't like very much.

+    if (renderDrawingRecorder.canUseCachedDrawing())
+        return;
+
     // Fill first.
     GraphicsContext* context = paintInfo.context;
     context->fillRect(borderRect, m_renderFrameSet.frameSet()->hasBorderColor() ? m_renderFrameSet.resolveColor(CSSPropertyBorderLeftColor) : borderFillColor());
@@ -53,6 +58,10 @@ void FrameSetPainter::paintRowBorder(const PaintInfo& paintInfo, const IntRect&
 
     // FIXME: We should do something clever when borders from distinct framesets meet at a join.
 
+    RenderDrawingRecorder renderDrawingRecorder(paintInfo.context, m_renderFrameSet, paintInfo.phase, borderRect);
+    if (renderDrawingRecorder.canUseCachedDrawing())
+        return;
+
     // Fill first.
     GraphicsContext* context = paintInfo.context;
     context->fillRect(borderRect, m_renderFrameSet.frameSet()->hasBorderColor() ? m_renderFrameSet.resolveColor(CSSPropertyBorderLeftColor) : borderFillColor());