Removed most calls to GraphicsContext3D from DrawingBuffer

Source/core/html/canvas/WebGLRenderingContext.cpp

Index: Source/core/html/canvas/WebGLRenderingContext.cpp
diff --git a/Source/core/html/canvas/WebGLRenderingContext.cpp b/Source/core/html/canvas/WebGLRenderingContext.cpp
index 387b5581e7e15d28e7e8af818006a0b5655250b6..0d097a754733b69c9f540c9265510efdab0471bb 100644
--- a/Source/core/html/canvas/WebGLRenderingContext.cpp
+++ b/Source/core/html/canvas/WebGLRenderingContext.cpp
@@ -126,7 +126,7 @@ size_t WebGLRenderingContext::oldestContextIndex()
     size_t candidateID = 0;
     for (size_t ii = 1; ii < activeContexts().size(); ++ii) {
         WebGLRenderingContext* context = activeContexts()[ii];
-        if (context->graphicsContext3D() && candidate->graphicsContext3D() && context->graphicsContext3D()->lastFlushID() < candidate->graphicsContext3D()->lastFlushID()) {
+        if (context->webGraphicsContext3D() && candidate->webGraphicsContext3D() && context->webGraphicsContext3D()->lastFlushID() < candidate->webGraphicsContext3D()->lastFlushID()) {
             candidate = context;
             candidateID = ii;
         }
@@ -577,7 +577,7 @@ WebGLRenderingContext::WebGLRenderingContext(HTMLCanvasElement* passedCanvas, Pa
 
     // Create the DrawingBuffer and initialize the platform layer.
     DrawingBuffer::PreserveDrawingBuffer preserve = preserveDrawingBuffer ? DrawingBuffer::Preserve : DrawingBuffer::Discard;
-    m_drawingBuffer = DrawingBuffer::create(m_contextSupport.get(), clampedCanvasSize(), preserve, contextEvictionManager.release());
+    m_drawingBuffer = DrawingBuffer::create(m_context.get(), clampedCanvasSize(), preserve, contextEvictionManager.release());
 
     if (!m_drawingBuffer->isZeroSized()) {
         m_drawingBuffer->bind();
@@ -5432,7 +5432,7 @@ void WebGLRenderingContext::maybeRestoreContext(Timer<WebGLRenderingContext>*)
     // Construct a new drawing buffer with the new GraphicsContext3D.
     m_drawingBuffer->releaseResources();
     DrawingBuffer::PreserveDrawingBuffer preserve = m_preserveDrawingBuffer ? DrawingBuffer::Preserve : DrawingBuffer::Discard;
-    m_drawingBuffer = DrawingBuffer::create(contextSupport.get(), clampedCanvasSize(), preserve, contextEvictionManager.release());
+    m_drawingBuffer = DrawingBuffer::create(context.get(), clampedCanvasSize(), preserve, contextEvictionManager.release());
 
     if (m_drawingBuffer->isZeroSized())
         return;