LayoutObject::invalidatePaintIfNeededForSynchronizedPainting() and plumbing

third_party/WebKit/Source/core/layout/LayoutObject.cpp

Index: third_party/WebKit/Source/core/layout/LayoutObject.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutObject.cpp b/third_party/WebKit/Source/core/layout/LayoutObject.cpp
index 4973d95d5ebc1706b4035522f31a2c6431fdfc04..d583aff8aa964246f0499d5fd45ba0e6845d8794 100644
--- a/third_party/WebKit/Source/core/layout/LayoutObject.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutObject.cpp
@@ -76,6 +76,7 @@
 #include "core/page/AutoscrollController.h"
 #include "core/page/Page.h"
 #include "core/paint/ObjectPainter.h"
+#include "core/paint/PaintInfo.h"
 #include "core/paint/PaintLayer.h"
 #include "core/style/ContentData.h"
 #include "core/style/ShadowList.h"
@@ -1416,6 +1417,32 @@ PaintInvalidationReason LayoutObject::invalidatePaintIfNeeded(PaintInvalidationS
     return invalidationReason;
 }
 
+void LayoutObject::invalidatePaintIfNeededForSynchronziedPainting(const PaintInfo& paintInfo)
+{
+    ASSERT(RuntimeEnabledFeatures::slimmingPaintSynchronizedPaintingEnabled());
+    ASSERT(document().lifecycle().state() == DocumentLifecycle::InPaint);
+    ASSERT(paintInfo.paintInvalidationState);
+    ASSERT(paintInfo.paintContainer());
+
+    DisplayItemList* displayItemList = paintInfo.context->displayItemList();
+    // TODO(chrishtr): paintInvalidationContainer for squashed layer.

[chrishtr, 2015/10/05 21:50:35]

This works out of the box. GraphicsLayer::paint calls into CLM::doPaintTask,
which
will loop over the paint layers and paint them.

[Xianzhu, 2015/10/05 22:04:15]

Done.

+    const LayoutBoxModelObject& paintInvalidationContainer = *paintInfo.paintContainer();
+
+    if (displayItemList->clientHasCheckedPaintInvalidation(displayItemClient())) {
+        ASSERT(displayItemList->clientCacheIsValid(displayItemClient())
+            == (invalidatePaintIfNeeded(*paintInfo.paintInvalidationState, paintInvalidationContainer) == PaintInvalidationNone));
+        return;
+    }
+
+    PaintInvalidationReason reason = invalidatePaintIfNeeded(*paintInfo.paintInvalidationState, paintInvalidationContainer);
+    clearPaintInvalidationState(*paintInfo.paintInvalidationState);
+
+    if (reason == PaintInvalidationDelayedFull)
+        paintInfo.paintInvalidationState->pushDelayedPaintInvalidationTarget(*this);
+
+    displayItemList->setClientHasCheckedPaintInvalidation(displayItemClient());
+}
+
 PaintInvalidationReason LayoutObject::paintInvalidationReason(const LayoutBoxModelObject& paintInvalidationContainer,
     const LayoutRect& oldBounds, const LayoutPoint& oldPositionFromPaintInvalidationBacking,
     const LayoutRect& newBounds, const LayoutPoint& newPositionFromPaintInvalidationBacking) const