[Oilpan] Prepare full definition of classes before using Member

third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp

 /*
  * Copyright (C) 2009 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 103 matching lines @@
 
 using WebGLRenderingContextBaseMap = WillBePersistentHeapHashMap<RawPtrWillBeWeakMember<WebGLRenderingContextBase>, int>;
 WebGLRenderingContextBaseMap& forciblyEvictedContexts()
 {
     DEFINE_STATIC_LOCAL(WebGLRenderingContextBaseMap, forciblyEvictedContexts, ());
     return forciblyEvictedContexts;
 }
 
 } // namespace
 
+WebGLRenderingContextBase::ScopedDrawingBufferBinder::ScopedDrawingBufferBinder(DrawingBuffer* drawingBuffer, WebGLFramebuffer* framebufferBinding)
+    : m_drawingBuffer(drawingBuffer)
+    , m_readFramebufferBinding(framebufferBinding)
+{
+    // Commit DrawingBuffer if needed (e.g., for multisampling)
+    if (!m_readFramebufferBinding && m_drawingBuffer)
+        m_drawingBuffer->commit();
+}
+
+WebGLRenderingContextBase::ScopedDrawingBufferBinder::~ScopedDrawingBufferBinder()
+{
+    // Restore DrawingBuffer if needed
+    if (!m_readFramebufferBinding && m_drawingBuffer)
+        m_drawingBuffer->restoreFramebufferBindings();
+}
+
 void WebGLRenderingContextBase::forciblyLoseOldestContext(const String& reason)
 {
     WebGLRenderingContextBase* candidate = oldestContext();
     if (!candidate)
         return;
 
     // This context could belong to a dead page and the last JavaScript reference has already
     // been lost. Garbage collection might be triggered in the middle of this function, for
     // example, printWarningToConsole() causes an upcall to JavaScript.
     // Must make sure that the context is not deleted until the call stack unwinds.
@@ skipping 6794 matching lines @@
 
     return totalBytesPerPixel;
 }
 
 DrawingBuffer* WebGLRenderingContextBase::drawingBuffer() const
 {
     return m_drawingBuffer.get();
 }
 
 } // namespace blink