Reland: 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