Merge 92520 - [chromium] Accelerated canvas breaks when moving canvases or resources between Pages

Source/WebCore/platform/graphics/chromium/WebGLLayerChromium.h

Index: Source/WebCore/platform/graphics/chromium/WebGLLayerChromium.h
===================================================================
--- Source/WebCore/platform/graphics/chromium/WebGLLayerChromium.h	(revision 93254)
+++ Source/WebCore/platform/graphics/chromium/WebGLLayerChromium.h	(working copy)
@@ -66,12 +66,15 @@
     explicit WebGLLayerChromium(GraphicsLayerChromium* owner);
     friend class WebGLLayerChromiumRateLimitTask;
 
+    virtual unsigned textureId() const { return m_textureId; }
     void rateLimitContext(Timer<WebGLLayerChromium>*);
 
     // GraphicsContext3D::platformLayer has a side-effect of assigning itself
     // to the layer. Because of that GraphicsContext3D's destructor will reset
     // layer's context to 0.
     GraphicsContext3D* m_context;
+    unsigned m_textureId;
+    bool m_textureChanged;
     bool m_contextSupportsRateLimitingExtension;
     Timer<WebGLLayerChromium> m_rateLimitingTimer;
     bool m_textureUpdated;