[oilpan] Completely move HTMLFormControlElement's hierarchy to the managed heap

Source/core/html/shadow/SliderThumbElement.cpp

Index: Source/core/html/shadow/SliderThumbElement.cpp
diff --git a/Source/core/html/shadow/SliderThumbElement.cpp b/Source/core/html/shadow/SliderThumbElement.cpp
index 775deb3aa00abce106ae6e2ac7614e6cdc0f3961..f9228bfcba91251fb5634389ef0562fe2acf7c94 100644
--- a/Source/core/html/shadow/SliderThumbElement.cpp
+++ b/Source/core/html/shadow/SliderThumbElement.cpp
@@ -54,14 +54,14 @@ namespace WebCore {
 
 using namespace HTMLNames;
 
-inline static Decimal sliderPosition(HTMLInputElement* element)
+inline static Decimal sliderPosition(Handle<HTMLInputElement> element)
 {
     const StepRange stepRange(element->createStepRange(RejectAny));
     const Decimal oldValue = parseToDecimalForNumberType(element->value(), stepRange.defaultValue());
     return stepRange.proportionFromValue(stepRange.clampValue(oldValue));
 }
 
-inline static bool hasVerticalAppearance(HTMLInputElement* input)
+inline static bool hasVerticalAppearance(Handle<HTMLInputElement> input)
 {
     ASSERT(input->renderer());
     RenderStyle* sliderStyle = input->renderer()->style();
@@ -137,7 +137,7 @@ private:
 
 void RenderSliderContainer::computeLogicalHeight(LayoutUnit logicalHeight, LayoutUnit logicalTop, LogicalExtentComputedValues& computedValues) const
 {
-    HTMLInputElement* input = node()->shadowHost()->toInputElement();
+    Handle<HTMLInputElement> input = node()->shadowHost()->toInputElement();
     bool isVertical = hasVerticalAppearance(input);
 
 #if ENABLE(DATALIST_ELEMENT)
@@ -165,7 +165,7 @@ void RenderSliderContainer::computeLogicalHeight(LayoutUnit logicalHeight, Layou
 
 void RenderSliderContainer::layout()
 {
-    HTMLInputElement* input = node()->shadowHost()->toInputElement();
+    Handle<HTMLInputElement> input = node()->shadowHost()->toInputElement();
     bool isVertical = hasVerticalAppearance(input);
     style()->setFlexDirection(isVertical ? FlowColumn : FlowRow);
     TextDirection oldTextDirection = style()->direction();
@@ -246,7 +246,7 @@ bool SliderThumbElement::matchesReadWritePseudoClass() const
 
 Node* SliderThumbElement::focusDelegate()
 {
-    return hostInput();
+    return Handle<HTMLInputElement>(hostInput()).raw();
 }
 
 void SliderThumbElement::dragFrom(const LayoutPoint& point)
@@ -257,8 +257,8 @@ void SliderThumbElement::dragFrom(const LayoutPoint& point)
 
 void SliderThumbElement::setPositionFromPoint(const LayoutPoint& point)
 {
-    HTMLInputElement* input = hostInput();
-    HTMLElement* trackElement = sliderTrackElementOf(input);
+    Handle<HTMLInputElement> input = hostInput();
+    HTMLElement* trackElement = sliderTrackElementOf(input.raw());
 
     if (!input->renderer() || !renderBox() || !trackElement->renderBox())
         return;
@@ -347,7 +347,7 @@ void SliderThumbElement::defaultEventHandler(Event* event)
 
     // FIXME: Should handle this readonly/disabled check in more general way.
     // Missing this kind of check is likely to occur elsewhere if adding it in each shadow element.
-    HTMLInputElement* input = hostInput();
+    Handle<HTMLInputElement> input = hostInput();
     if (!input || input->isDisabledOrReadOnly()) {
         stopDragging();
         HTMLDivElement::defaultEventHandler(event);
@@ -378,7 +378,7 @@ void SliderThumbElement::defaultEventHandler(Event* event)
 
 bool SliderThumbElement::willRespondToMouseMoveEvents()
 {
-    const HTMLInputElement* input = hostInput();
+    Handle<const HTMLInputElement> input = hostInput();
     if (input && !input->isDisabledOrReadOnly() && m_inDragMode)
         return true;
 
@@ -387,7 +387,7 @@ bool SliderThumbElement::willRespondToMouseMoveEvents()
 
 bool SliderThumbElement::willRespondToMouseClickEvents()
 {
-    const HTMLInputElement* input = hostInput();
+    Handle<const HTMLInputElement> input = hostInput();
     if (input && !input->isDisabledOrReadOnly())
         return true;
 
@@ -403,7 +403,7 @@ void SliderThumbElement::detach()
     HTMLDivElement::detach();
 }
 
-HTMLInputElement* SliderThumbElement::hostInput() const
+Result<HTMLInputElement> SliderThumbElement::hostInput() const
 {
     // Only HTMLInputElement creates SliderThumbElement instances as its shadow nodes.
     // So, shadowHost() must be an HTMLInputElement.
@@ -424,7 +424,7 @@ static const AtomicString& mediaSliderThumbShadowPseudoId()
 
 const AtomicString& SliderThumbElement::shadowPseudoId() const
 {
-    HTMLInputElement* input = hostInput();
+    Handle<HTMLInputElement> input = hostInput();
     if (!input)
         return sliderThumbShadowPseudoId();
 
@@ -464,7 +464,7 @@ const AtomicString& SliderContainerElement::shadowPseudoId() const
     DEFINE_STATIC_LOCAL(const AtomicString, mediaSliderContainer, ("-webkit-media-slider-container", AtomicString::ConstructFromLiteral));
     DEFINE_STATIC_LOCAL(const AtomicString, sliderContainer, ("-webkit-slider-container", AtomicString::ConstructFromLiteral));
 
-    HTMLInputElement* input = shadowHost()->toInputElement();
+    Handle<HTMLInputElement> input = shadowHost()->toInputElement();
     if (!input)
         return sliderContainer;