Set needs paint property update for changes of SVG isolation and blending.

BUG=677241
TEST=css3/blending/svg-isolation-*
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2

Review-Url: https://codereview.chromium.org/2607003002
Cr-Commit-Position: refs/heads/master@{#440913}

third_party/WebKit/Source/core/layout/svg/LayoutSVGContainer.cpp

@@ -111,18 +111,23 @@ void LayoutSVGContainer::styleDidChange(StyleDifference diff,
   bool hadIsolation =
       oldStyle && !isSVGHiddenContainer() &&
       SVGLayoutSupport::willIsolateBlendingDescendantsForStyle(*oldStyle);
-  bool isolationChanged =
-      hadIsolation ==
-      !SVGLayoutSupport::willIsolateBlendingDescendantsForObject(this);
+
+  bool willIsolateBlendingDescendants =
+      SVGLayoutSupport::willIsolateBlendingDescendantsForObject(this);
+
+  bool isolationChanged = hadIsolation != willIsolateBlendingDescendants;
+
+  if (isolationChanged)
+    setNeedsPaintPropertyUpdate();
 
   if (!parent() || !isolationChanged)
     return;
 
-  if (hasNonIsolatedBlendingDescendants())
+  if (hasNonIsolatedBlendingDescendants()) {
     parent()->descendantIsolationRequirementsChanged(
-        SVGLayoutSupport::willIsolateBlendingDescendantsForObject(this)
-            ? DescendantIsolationNeedsUpdate
+        willIsolateBlendingDescendants ? DescendantIsolationNeedsUpdate
                                        : DescendantIsolationRequired);
+  }
 }
 
 bool LayoutSVGContainer::hasNonIsolatedBlendingDescendants() const {

third_party/WebKit/Source/core/layout/svg/LayoutSVGModelObject.cpp

@@ -125,6 +125,9 @@ void LayoutSVGModelObject::styleDidChange(StyleDifference diff,
       parent()->descendantIsolationRequirementsChanged(
           style()->hasBlendMode() ? DescendantIsolationRequired
                                   : DescendantIsolationNeedsUpdate);
+
+    if (hasBlendModeChanged)
+      setNeedsPaintPropertyUpdate();
   }
 
   LayoutObject::styleDidChange(diff, oldStyle);

third_party/WebKit/Source/core/paint/FindPropertiesNeedingUpdate.h

@@ -187,10 +187,12 @@ class FindObjectPropertiesNeedingUpdateScope {
                                   originalBorderBox->propertyTreeState.scroll(),
                                   objectBorderBox->propertyTreeState.scroll());
       } else {
-        DCHECK_EQ(!!originalBorderBox, !!objectBorderBox);
+        DCHECK_EQ(!!originalBorderBox, !!objectBorderBox)
+            << " Object: " << m_object.debugName();
       }
     } else {
-      DCHECK_EQ(!!m_originalProperties, !!objectProperties);
+      DCHECK_EQ(!!m_originalProperties, !!objectProperties)
+          << " Object: " << m_object.debugName();
     }
     // Restore original clean bit.
     m_object.getMutableForPainting().clearNeedsPaintPropertyUpdateForTesting();