Revert of Enable fast/images with slimming paint

Source/core/paint/TransparencyDisplayItem.cpp

Index: Source/core/paint/TransparencyDisplayItem.cpp
diff --git a/Source/core/paint/TransparencyDisplayItem.cpp b/Source/core/paint/TransparencyDisplayItem.cpp
index 90dd628be3af5750359c3a68fdd9975dd668bea4..77605749f74b035fee3a09e5c0dd1def7c8bb693 100644
--- a/Source/core/paint/TransparencyDisplayItem.cpp
+++ b/Source/core/paint/TransparencyDisplayItem.cpp
@@ -5,15 +5,15 @@
 #include "config.h"
 #include "core/paint/TransparencyDisplayItem.h"
 
-#include "core/rendering/RenderObject.h"
-#include "core/rendering/RenderView.h"
-#include "platform/RuntimeEnabledFeatures.h"
 #include "platform/graphics/GraphicsContext.h"
 
 namespace blink {
 
 void BeginTransparencyDisplayItem::replay(GraphicsContext* context)
 {
+    context->save();
+    context->clip(m_clipRect);
+
     bool hasBlendMode = this->hasBlendMode();
     if (hasBlendMode)
         context->setCompositeOperation(context->compositeOperation(), m_blendMode);
@@ -22,13 +22,17 @@
 
     if (hasBlendMode)
         context->setCompositeOperation(context->compositeOperation(), WebBlendModeNormal);
+#ifdef REVEAL_TRANSPARENCY_LAYERS
+    context->fillRect(clipRect, Color(0.0f, 0.0f, 0.5f, 0.2f));
+#endif
 }
 
 #ifndef NDEBUG
 WTF::String BeginTransparencyDisplayItem::asDebugString() const
 {
-    return String::format("{%s, type: \"%s\", hasBlendMode: %d, blendMode: %d, opacity: %f}",
+    return String::format("{%s, type: \"%s\", clip bounds: [%f,%f,%f,%f], hasBlendMode: %d, blendMode: %d, opacity: %f}",
         rendererDebugString(renderer()).utf8().data(), typeAsDebugString(type()).utf8().data(),
+        m_clipRect.x().toFloat(), m_clipRect.y().toFloat(), m_clipRect.width().toFloat(), m_clipRect.height().toFloat(),
         hasBlendMode(), m_blendMode, m_opacity);
 }
 #endif
@@ -36,6 +40,7 @@
 void EndTransparencyDisplayItem::replay(GraphicsContext* context)
 {
     context->endLayer();
+    context->restore();
 }
 
 #ifndef NDEBUG
@@ -46,25 +51,4 @@
 }
 #endif
 
-TransparencyRecorder::TransparencyRecorder(GraphicsContext* graphicsContext, const RenderObject* renderer, DisplayItem::Type type, const WebBlendMode& blendMode, const float opacity)
-    : m_renderer(renderer)
-    , m_type(type)
-    , m_graphicsContext(graphicsContext)
-{
-    OwnPtr<BeginTransparencyDisplayItem> beginTransparencyDisplayItem = adoptPtr(new BeginTransparencyDisplayItem(renderer, type, blendMode, opacity));
-    if (RuntimeEnabledFeatures::slimmingPaintEnabled())
-        renderer->view()->viewDisplayList().add(beginTransparencyDisplayItem.release());
-    else
-        beginTransparencyDisplayItem->replay(graphicsContext);
-}
-
-TransparencyRecorder::~TransparencyRecorder()
-{
-    OwnPtr<EndTransparencyDisplayItem> endTransparencyDisplayItem = adoptPtr(new EndTransparencyDisplayItem(m_renderer, m_type));
-    if (RuntimeEnabledFeatures::slimmingPaintEnabled())
-        m_renderer->view()->viewDisplayList().add(endTransparencyDisplayItem.release());
-    else
-        endTransparencyDisplayItem->replay(m_graphicsContext);
-}
-
 } // namespace blink