Oilpan: move 2D Canvas and WebGL objects to the heap.

Source/core/html/canvas/WebGLRenderingContext.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 61 matching lines @@
     Settings* settings = frame->settings();
 
     // The FrameLoaderClient might block creation of a new WebGL context despite the page settings; in
     // particular, if WebGL contexts were lost one or more times via the GL_ARB_robustness extension.
     if (!frame->loader().client()->allowWebGL(settings && settings->webGLEnabled())) {
         canvas->dispatchEvent(WebGLContextEvent::create(EventTypeNames::webglcontextcreationerror, false, true, "Web page was not allowed to create a WebGL context."));
         return nullptr;
     }
 
     // The only situation that attrs is null is through Document::getCSSCanvasContext().
-    RefPtr<WebGLContextAttributes> defaultAttrs;
+    RefPtrWillBeRawPtr<WebGLContextAttributes> defaultAttrs = nullptr;
     if (!attrs) {
         defaultAttrs = WebGLContextAttributes::create();
         attrs = defaultAttrs.get();
     }
     blink::WebGraphicsContext3D::Attributes attributes = attrs->attributes(document.topDocument().url().string(), settings, 1);
     OwnPtr<blink::WebGraphicsContext3D> context = adoptPtr(blink::Platform::current()->createOffscreenGraphicsContext3D(attributes, 0));
     if (!context || !context->makeContextCurrent()) {
         canvas->dispatchEvent(WebGLContextEvent::create(EventTypeNames::webglcontextcreationerror, false, true, "Could not create a WebGL context."));
         return nullptr;
     }
 
     OwnPtr<Extensions3DUtil> extensionsUtil = Extensions3DUtil::create(context.get());
     if (!extensionsUtil)
         return nullptr;
     if (extensionsUtil->supportsExtension("GL_EXT_debug_marker"))
         context->pushGroupMarkerEXT("WebGLRenderingContext");
 
     OwnPtrWillBeRawPtr<WebGLRenderingContext> renderingContext = adoptPtrWillBeNoop(new WebGLRenderingContext(canvas, context.release(), attrs));
     renderingContext->registerContextExtensions();
     renderingContext->suspendIfNeeded();
 
-    if (!renderingContext->m_drawingBuffer) {
+    if (!renderingContext->drawingBuffer()) {
         canvas->dispatchEvent(WebGLContextEvent::create(EventTypeNames::webglcontextcreationerror, false, true, "Could not create a WebGL context."));
         return nullptr;
     }
 
     return renderingContext.release();
 }
 
 WebGLRenderingContext::WebGLRenderingContext(HTMLCanvasElement* passedCanvas, PassOwnPtr<blink::WebGraphicsContext3D> context, WebGLContextAttributes* requestedAttributes)
     : WebGLRenderingContextBase(passedCanvas, context, requestedAttributes)
 {
     ScriptWrappable::init(this);
 }
 
 WebGLRenderingContext::~WebGLRenderingContext()
 {
-
 }
 
 void WebGLRenderingContext::registerContextExtensions()
 {
     // Register extensions.
     static const char* const bothPrefixes[] = { "", "WEBKIT_", 0, };
 
     registerExtension<ANGLEInstancedArrays>(m_angleInstancedArrays);
     registerExtension<EXTBlendMinMax>(m_extBlendMinMax);
     registerExtension<EXTFragDepth>(m_extFragDepth);
@@ skipping 10 matching lines @@
     registerExtension<WebGLCompressedTextureETC1>(m_webglCompressedTextureETC1);
     registerExtension<WebGLCompressedTexturePVRTC>(m_webglCompressedTexturePVRTC, ApprovedExtension, bothPrefixes);
     registerExtension<WebGLCompressedTextureS3TC>(m_webglCompressedTextureS3TC, ApprovedExtension, bothPrefixes);
     registerExtension<WebGLDebugRendererInfo>(m_webglDebugRendererInfo);
     registerExtension<WebGLDebugShaders>(m_webglDebugShaders);
     registerExtension<WebGLDepthTexture>(m_webglDepthTexture, ApprovedExtension, bothPrefixes);
     registerExtension<WebGLDrawBuffers>(m_webglDrawBuffers);
     registerExtension<WebGLLoseContext>(m_webglLoseContext, ApprovedExtension, bothPrefixes);
 }
 
+void WebGLRenderingContext::trace(Visitor* visitor)
+{
+    visitor->trace(m_angleInstancedArrays);
+    visitor->trace(m_extBlendMinMax);
+    visitor->trace(m_extFragDepth);
+    visitor->trace(m_extShaderTextureLOD);
+    visitor->trace(m_extTextureFilterAnisotropic);
+    visitor->trace(m_oesTextureFloat);
+    visitor->trace(m_oesTextureFloatLinear);
+    visitor->trace(m_oesTextureHalfFloat);
+    visitor->trace(m_oesTextureHalfFloatLinear);
+    visitor->trace(m_oesStandardDerivatives);
+    visitor->trace(m_oesVertexArrayObject);
+    visitor->trace(m_oesElementIndexUint);
+    visitor->trace(m_webglLoseContext);
+    visitor->trace(m_webglDebugRendererInfo);
+    visitor->trace(m_webglDebugShaders);
+    visitor->trace(m_webglDrawBuffers);
+    visitor->trace(m_webglCompressedTextureATC);
+    visitor->trace(m_webglCompressedTextureETC1);
+    visitor->trace(m_webglCompressedTexturePVRTC);
+    visitor->trace(m_webglCompressedTextureS3TC);
+    visitor->trace(m_webglDepthTexture);
+    WebGLRenderingContextBase::trace(visitor);
+}
+
 } // namespace blink