Revert of Make 2D canvas disable gpu acceleration when getImageData is called

third_party/WebKit/Source/platform/graphics/test/FakeWebGraphicsContext3DProvider.h

-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "gpu/command_buffer/client/gles2_interface.h"
-#include "gpu/command_buffer/common/capabilities.h"
-#include "public/platform/WebGraphicsContext3DProvider.h"
-#include "third_party/skia/include/gpu/GrContext.h"
-#include "third_party/skia/include/gpu/gl/GrGLInterface.h"
-#include "wtf/RefPtr.h"
-
-namespace blink {
-
-class FakeWebGraphicsContext3DProvider : public WebGraphicsContext3DProvider {
-public:
-    FakeWebGraphicsContext3DProvider(gpu::gles2::GLES2Interface* gl)
-        : m_gl(gl)
-    {
-        RefPtr<const GrGLInterface> glInterface = adoptRef(GrGLCreateNullInterface());
-        m_grContext = adoptRef(GrContext::Create(kOpenGL_GrBackend, reinterpret_cast<GrBackendContext>(glInterface.get())));
-    }
-
-    GrContext* grContext() override
-    {
-        return m_grContext.get();
-    }
-
-    gpu::Capabilities getCapabilities()
-    {
-        return gpu::Capabilities();
-    }
-
-    gpu::gles2::GLES2Interface* contextGL() override
-    {
-        return m_gl;
-    }
-
-    bool bindToCurrentThread() override { return false; }
-    void setLostContextCallback(WebClosure) override {}
-    void setErrorMessageCallback(WebFunction<void(const char*, int32_t id)>) {}
-
-private:
-    gpu::gles2::GLES2Interface* m_gl;
-    RefPtr<GrContext> m_grContext;
-};
-
-} // namespace blink