Implement offscreenCanvas.getContext('webgl') on a worker thread

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

Index: third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.h
diff --git a/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.h b/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.h
index 8d225171f7490da6c60aa362ee397a2ccaf55959..58c2a4c8628f125f9fb427b1868d25a0d2397cf3 100644
--- a/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.h
+++ b/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.h
@@ -44,6 +44,8 @@
 #include "platform/graphics/gpu/DrawingBuffer.h"
 #include "platform/graphics/gpu/Extensions3DUtil.h"
 #include "platform/graphics/gpu/WebGLImageConversion.h"
+#include "public/platform/Platform.h"
+#include "public/platform/WebGraphicsContext3DProvider.h"
 #include "third_party/khronos/GLES2/gl2.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/text/WTFString.h"
@@ -83,6 +85,7 @@ class OESTextureFloatLinear;
 class OESTextureHalfFloat;
 class OESTextureHalfFloatLinear;
 class OESVertexArrayObject;
+class WaitableEvent;
 class WebGLActiveInfo;
 class WebGLBuffer;
 class WebGLCompressedTextureASTC;
@@ -1090,6 +1093,27 @@ protected:
 
 private:
     WebGLRenderingContextBase(HTMLCanvasElement*, OffscreenCanvas*, PassOwnPtr<WebGraphicsContext3DProvider>, const WebGLContextAttributes&);
+    static PassOwnPtr<WebGraphicsContext3DProvider> createWebGraphicsContext3DProviderInternal(HTMLCanvasElement*, ScriptState*, WebGLContextAttributes, unsigned);

[Ken Russell (switch to Gerrit), 2016/05/06 17:56:46]

WebGraphicsContext3D has been removed as a concept from the codebase thanks to
danakj@ and the last remaining references like WebGraphicsContext3DProvider are
due to be renamed. Let's please not add more uses of the name. Everywhere
WebGraphicsContext3D is referenced, let's just use Context. Let's call this
method createContextProviderInternal.

+    class createWebGraphicsContext3DProviderUtils {

[Ken Russell (switch to Gerrit), 2016/05/06 17:56:46]

Classes' names should be capitalized. This should be something like
ContextProviderCreationInfo or ContextProviderCreationUtils.

+    public:
+        createWebGraphicsContext3DProviderUtils(Platform::ContextAttributes contextAttributes, Platform::GraphicsInfo glInfo, ScriptState* scriptState)
+        {
+            m_contextAttributes = contextAttributes;
+            m_glInfo = glInfo;
+            m_scriptState = scriptState;
+        }
+        Platform::ContextAttributes contextAttributes() { return m_contextAttributes; }
+        Platform::GraphicsInfo glInfo() { return m_glInfo; }
+        ScriptState* scriptState() { return m_scriptState; }
+        void setContextProvider(PassOwnPtr<WebGraphicsContext3DProvider> provider) { m_provider = std::move(provider); }
+        PassOwnPtr<WebGraphicsContext3DProvider> releaseContextProvider() { return m_provider.release(); }
+    private:
+        Platform::ContextAttributes m_contextAttributes;
+        Platform::GraphicsInfo m_glInfo;
+        ScriptState* m_scriptState;
+        OwnPtr<WebGraphicsContext3DProvider> m_provider;
+    };
+    static void createWebGraphicsContext3DProviderOnMainThread(createWebGraphicsContext3DProviderUtils*, WaitableEvent*);
 };
 
 DEFINE_TYPE_CASTS(WebGLRenderingContextBase, CanvasRenderingContext, context, context->is3d(), context.is3d());