Add STACK_ALLOCATED to LayoutObject referencing structs

Add STACK_ALLOCATED to LayoutObject referencing structs in anticipation of oilpanization of LayoutObjects.

Bug: 1030176
Change-Id: I81bc2a6db7b6ce891885ed106311299dd6c26b9d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2298884Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Keishi Hattori <keishi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#788784}

third_party/blink/renderer/core/editing/caret_display_item_client.h

@@ -72,6 +72,9 @@ class CORE_EXPORT CaretDisplayItemClient final : public DisplayItemClient {
   friend class ParameterizedComputeCaretRectTest;
 
   struct CaretRectAndPainterBlock {
+    STACK_ALLOCATED();
+
+   public:
     PhysicalRect caret_rect;  // local to |painter_block|
     LayoutBlock* painter_block = nullptr;
   };

third_party/blink/renderer/core/layout/flexible_box_algorithm.h

@@ -66,6 +66,8 @@ enum class TransformedWritingMode {
 typedef Vector<FlexItem, 8> FlexItemVector;
 
 class AutoClearOverrideLogicalHeight {
+  STACK_ALLOCATED();
+
  public:
   explicit AutoClearOverrideLogicalHeight(LayoutBox* box)
       : box_(box), old_override_height_(-1) {

third_party/blink/renderer/core/layout/layout_block_flow_line.cc

@@ -1458,6 +1458,9 @@ void LayoutBlockFlow::MarkDirtyFloatsForPaintInvalidation(
 //     can have distinct borders/margin/padding that contribute to the min/max
 //     width.
 struct InlineMinMaxIterator {
+  STACK_ALLOCATED();
+
+ public:
   LayoutObject* parent;
   LayoutObject* current;
   bool end_of_inline;

third_party/blink/renderer/core/layout/layout_deprecated_flexible_box.cc

@@ -40,6 +40,8 @@
 namespace blink {
 
 class FlexBoxIterator {
+  STACK_ALLOCATED();
+
  public:
   FlexBoxIterator(LayoutDeprecatedFlexibleBox* parent)
       : box_(parent), largest_ordinal_(1) {