Revert 177827 "WebGL: Free temporary GPU resources held by inact..."

trunk/Source/platform/graphics/gpu/DrawingBuffer.h

Index: trunk/Source/platform/graphics/gpu/DrawingBuffer.h
===================================================================
--- trunk/Source/platform/graphics/gpu/DrawingBuffer.h	(revision 177853)
+++ trunk/Source/platform/graphics/gpu/DrawingBuffer.h	(working copy)
@@ -142,7 +142,6 @@
     void markContentsChanged();
     void markLayerComposited();
     bool layerComposited() const;
-    void setIsHidden(bool);
 
     blink::WebLayer* platformLayer();
     void paintCompositedResultsToCanvas(ImageBuffer*);
@@ -179,7 +178,7 @@
     bool initialize(const IntSize&);
 
 private:
-    void mailboxReleasedWithoutRecycling(const blink::WebExternalTextureMailbox&);
+    void mailboxReleasedWhileDestructionInProgress(const blink::WebExternalTextureMailbox&);
 
     unsigned createColorTexture();
     // Create the depth/stencil and multisample buffers, if needed.
@@ -196,7 +195,6 @@
     PassRefPtr<MailboxInfo> recycledMailbox();
     PassRefPtr<MailboxInfo> createNewMailbox(const TextureInfo&);
     void deleteMailbox(const blink::WebExternalTextureMailbox&);
-    void freeRecycledMailboxes();
 
     // Updates the current size of the buffer, ensuring that s_currentResourceUsePixels is updated.
     void setSize(const IntSize& size);
@@ -281,7 +279,6 @@
     int m_sampleCount;
     int m_packAlignment;
     bool m_destructionInProgress;
-    bool m_isHidden;
 
     OwnPtr<blink::WebExternalTextureLayer> m_layer;