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diff --git a/gfx/angle/src/libANGLE/Debug.h b/gfx/angle/src/libANGLE/Debug.h
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+++ b/gfx/angle/src/libANGLE/Debug.h
@@ -0,0 +1,120 @@
+//
+// Copyright (c) 2015 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+
+// Debug.h: Defines debug state used for GL_KHR_debug
+
+#ifndef LIBANGLE_DEBUG_H_
+#define LIBANGLE_DEBUG_H_
+
+#include "angle_gl.h"
+#include "common/angleutils.h"
+
+#include <deque>
+#include <string>
+#include <vector>
+
+namespace gl
+{
+
+class LabeledObject
+{
+ public:
+ virtual ~LabeledObject() {}
+ virtual void setLabel(const std::string &label) = 0;
+ virtual const std::string &getLabel() const = 0;
+};
+
+class Debug : angle::NonCopyable
+{
+ public:
+ Debug();
+
+ void setMaxLoggedMessages(GLuint maxLoggedMessages);
+
+ void setOutputEnabled(bool enabled);
+ bool isOutputEnabled() const;
+
+ void setOutputSynchronous(bool synchronous);
+ bool isOutputSynchronous() const;
+
+ void setCallback(GLDEBUGPROCKHR callback, const void *userParam);
+ GLDEBUGPROCKHR getCallback() const;
+ const void *getUserParam() const;
+
+ void insertMessage(GLenum source,
+ GLenum type,
+ GLuint id,
+ GLenum severity,
+ const std::string &message);
+ void insertMessage(GLenum source,
+ GLenum type,
+ GLuint id,
+ GLenum severity,
+ std::string &&message);
+
+ void setMessageControl(GLenum source,
+ GLenum type,
+ GLenum severity,
+ std::vector<GLuint> &&ids,
+ bool enabled);
+ size_t getMessages(GLuint count,
+ GLsizei bufSize,
+ GLenum *sources,
+ GLenum *types,
+ GLuint *ids,
+ GLenum *severities,
+ GLsizei *lengths,
+ GLchar *messageLog);
+ size_t getNextMessageLength() const;
+ size_t getMessageCount() const;
+
+ void pushGroup(GLenum source, GLuint id, std::string &&message);
+ void popGroup();
+ size_t getGroupStackDepth() const;
+
+ private:
+ bool isMessageEnabled(GLenum source, GLenum type, GLuint id, GLenum severity) const;
+
+ void pushDefaultGroup();
+
+ struct Message
+ {
+ GLenum source;
+ GLenum type;
+ GLuint id;
+ GLenum severity;
+ std::string message;
+ };
+
+ struct Control
+ {
+ GLenum source;
+ GLenum type;
+ GLenum severity;
+ std::vector<GLuint> ids;
+ bool enabled;
+ };
+
+ struct Group
+ {
+ GLenum source;
+ GLuint id;
+ std::string message;
+
+ std::vector<Control> controls;
+ };
+
+ bool mOutputEnabled;
+ GLDEBUGPROCKHR mCallbackFunction;
+ const void *mCallbackUserParam;
+ std::deque<Message> mMessages;
+ GLuint mMaxLoggedMessages;
+ bool mOutputSynchronous;
+ std::vector<Group> mGroups;
+};
+} // namespace gl
+
+#endif // LIBANGLE_DEBUG_H_