Revert of Revert vector icon CLs.

ui/gfx/vector_icons.h

+// Copyright 2015 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.
+
+// This file provides defines needed by PaintVectorIcon and is implemented
+// by the generated file vector_icons.cc.
+
+#ifndef UI_GFX_VECTOR_ICONS_H_
+#define UI_GFX_VECTOR_ICONS_H_
+
+#include "third_party/skia/include/core/SkScalar.h"
+
+namespace gfx {
+
+enum class VectorIconId;
+
+// The size of a single side of the square canvas to which path coordinates
+// are relative, in device independent pixels.
+const int kReferenceSizeDip = 48;
+
+// A path command; each correlates to an SVG path command.
+enum CommandType {
+  MOVE_TO,
+  R_MOVE_TO,
+  LINE_TO,
+  R_LINE_TO,
+  H_LINE_TO,
+  R_H_LINE_TO,
+  V_LINE_TO,
+  R_V_LINE_TO,
+  R_CUBIC_TO,
+  CIRCLE,
+  CLOSE,
+  END
+};
+
+// A POD that describes either a path command or an argument for it.
+struct PathElement {
+  PathElement(CommandType value) : type(value) {}
+  PathElement(SkScalar value) : arg(value) {}
+
+  union {
+    CommandType type;
+    SkScalar arg;
+  };
+};
+
+// Returns an array of path commands and arguments, terminated by END.
+const PathElement* GetPathForVectorIcon(VectorIconId id);
+
+}  // namespace gfx
+
+#endif  // UI_GFX_VECTOR_ICONS_H_