[Slimming Paint] Implement deferred SVG filters

Source/core/rendering/svg/RenderSVGResourceFilter.cpp

Index: Source/core/rendering/svg/RenderSVGResourceFilter.cpp
diff --git a/Source/core/rendering/svg/RenderSVGResourceFilter.cpp b/Source/core/rendering/svg/RenderSVGResourceFilter.cpp
index d864b2238e41cde1d088da76734497f9e3b021d1..8644d981cab724538b5e91163c7c562bec7e1976 100644
--- a/Source/core/rendering/svg/RenderSVGResourceFilter.cpp
+++ b/Source/core/rendering/svg/RenderSVGResourceFilter.cpp
@@ -30,6 +30,7 @@
 #include "platform/graphics/filters/SkiaImageFilterBuilder.h"
 #include "platform/graphics/filters/SourceAlpha.h"
 #include "platform/graphics/filters/SourceGraphic.h"
+#include "platform/graphics/paint/DisplayItemList.h"
 #include "third_party/skia/include/core/SkPicture.h"
 
 namespace blink {
@@ -114,8 +115,6 @@ PassRefPtrWillBeRawPtr<SVGFilterBuilder> RenderSVGResourceFilter::buildPrimitive
 
 static void beginDeferredFilter(GraphicsContext* context, FilterData* filterData)
 {
-    // FIXME: Create a new GraphicsContext here to replace the existing context instead
-    // of nesting recordings.
     context->beginRecording(filterData->boundaries);
 }
 
@@ -124,6 +123,8 @@ static void endDeferredFilter(GraphicsContext* context, FilterData* filterData)
     // FIXME: maybe filterData should just hold onto SourceGraphic after creation?
     SourceGraphic* sourceGraphic = static_cast<SourceGraphic*>(filterData->builder->getEffectById(SourceGraphic::effectName()));
     ASSERT(sourceGraphic);
+    if (context->displayItemList())

[chrishtr, 2015/01/24 00:02:02]

if (RuntimeEnabledFeatures::slimmingPaintEnabled()) {
  ASSERT(context->displayItemList());
  context->displayItemList()->replay(context);
}

[pdr., 2015/01/24 01:13:36]

Done.

+        context->displayItemList()->replay(context);
     sourceGraphic->setPicture(context->endRecording());
 }
 
@@ -222,7 +223,7 @@ bool RenderSVGResourceFilter::prepareEffect(RenderObject* object, GraphicsContex
     return true;
 }
 
-void RenderSVGResourceFilter::finishEffect(RenderObject* object, GraphicsContext* context)
+void RenderSVGResourceFilter::finishEffect(RenderObject* object, GraphicsContext* context, GraphicsContext* contentContext)
 {
     ASSERT(object);
     ASSERT(context);
@@ -232,7 +233,7 @@ void RenderSVGResourceFilter::finishEffect(RenderObject* object, GraphicsContext
         return;
 
     if (filterData->m_needToEndFilter)
-        endDeferredFilter(context, filterData);
+        endDeferredFilter(contentContext, filterData);
 
     drawDeferredFilter(context, filterData, toSVGFilterElement(element()));
     filterData->m_needToEndFilter = false;