Oilpan: Expose Heap::collectGarbage to the web layer

Source/web/WebHeap.cpp

 /*
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "public/web/WebHeap.h"
 
-#include "platform/heap/ThreadState.h"
+#include "platform/heap/Handle.h"
 
 namespace blink {
 
 WebHeap::SafePointScope::SafePointScope()
 {
     ThreadState::current()->enterSafePointWithPointers(this);
 }
 
 WebHeap::SafePointScope::~SafePointScope()
 {
     ThreadState::current()->leaveSafePoint();
 }
 
+void WebHeap::collectGarbageForTesting()
+{
+    Heap::collectGarbage(ThreadState::HeapPointersOnStack);
+}
+
+void WebHeap::collectAllGarbageForTesting()
+{
+    Heap::collectAllGarbage();
+}
+
 } // namespace blink