Oilpan: eagerly finalize WebGLRenderingContext objects.

Source/core/html/canvas/WebGLContextGroup.h

Index: Source/core/html/canvas/WebGLContextGroup.h
diff --git a/Source/core/html/canvas/WebGLContextGroup.h b/Source/core/html/canvas/WebGLContextGroup.h
index 486b2bcd7bfc39db423d09ae6500fd2f8081e770..3cdafaa9c225e30a386d2b653e3ef5e1d5f5371d 100644
--- a/Source/core/html/canvas/WebGLContextGroup.h
+++ b/Source/core/html/canvas/WebGLContextGroup.h
@@ -32,16 +32,11 @@
 #include "wtf/RefCounted.h"
 
 namespace blink {
-class WebGraphicsContext3D;
-}
-
-namespace blink {
 
+class WebGraphicsContext3D;
 class WebGLSharedObject;
 class WebGLRenderingContextBase;
 
-typedef int ExceptionCode;
-
 class WebGLContextGroup final : public RefCounted<WebGLContextGroup> {
 public:
     static PassRefPtr<WebGLContextGroup> create();
@@ -57,6 +52,23 @@ public:
 
     void loseContextGroup(WebGLRenderingContextBase::LostContextMode, WebGLRenderingContextBase::AutoRecoveryMethod);
 
+#if ENABLE(OILPAN) && defined(ADDRESS_SANITIZER)
+    void poisonContext(bool);
+    void poisonObject(WebGLSharedObject*, bool);
+
+    class UnpoisonScope final {
+        STACK_ALLOCATED();
+    public:
+        UnpoisonScope(WebGLContextGroup*);
+        UnpoisonScope(WebGLContextGroup*, WebGLSharedObject*);
+        ~UnpoisonScope();
+
+    private:
+        Member<WebGLContextGroup> m_context;
+        Member<WebGLSharedObject> m_object;
+    };
+#endif
+
 private:
     friend class WebGLObject;