Fix missing StackFrameDepth constructor

third_party/WebKit/Source/platform/heap/StackFrameDepth.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef StackFrameDepth_h
 #define StackFrameDepth_h
 
 #include "platform/PlatformExport.h"
 #include "wtf/Allocator.h"
 #include "wtf/Assertions.h"
 #include <cstddef>
 #include <stdint.h>
 
 namespace blink {
 
 // StackFrameDepth keeps track of current call stack frame depth.
 // It is specifically used to control stack usage while tracing
 // the object graph during a GC.
 //
 // Use isSafeToRecurse() to determine if it is safe to consume
 // more stack by invoking another recursive call.
 class PLATFORM_EXPORT StackFrameDepth final {
     DISALLOW_NEW();
 public:
+    StackFrameDepth(): m_stackFrameLimit(kMinimumStackLimit) {}
     bool isSafeToRecurse()
     {
         // Asssume that the stack grows towards lower addresses, which
         // all the ABIs currently supported do.
         //
         // A unit test checks that the assumption holds for a target
         // (HeapTest.StackGrowthDirection.)
         return currentStackFrame() > m_stackFrameLimit;
     }
 
@@ skipping 71 matching lines @@
         m_depth->disableStackLimit();
     }
 
 private:
     StackFrameDepth* m_depth;
 };
 
 } // namespace blink
 
 #endif // StackFrameDepth_h