Introduce some util code for drawing vector assets.

ui/gfx/vector_icons.h

Index: ui/gfx/vector_icons.h
diff --git a/ui/gfx/vector_icons.h b/ui/gfx/vector_icons.h
new file mode 100644
index 0000000000000000000000000000000000000000..cf0448b8959c748338bee5f36dc7a60d058a0a27
--- /dev/null
+++ b/ui/gfx/vector_icons.h
@@ -0,0 +1,33 @@
+// 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.
+
+#ifndef UI_GFX_VECTOR_ICONS_H_
+#define UI_GFX_VECTOR_ICONS_H_
+
+#include "base/basictypes.h"
+#include "third_party/skia/include/core/SkColor.h"
+#include "ui/gfx/gfx_export.h"
+
+namespace gfx {
+
+class Canvas;
+
+enum class VectorIconId {
+  VECTOR_ICON_NONE,
+
+  CHECK_CIRCLE,
+  PHOTO_CAMERA,
+};
+
+// Draws a vector icon identified by |id| onto |canvas| at (0, 0). |dp_size|
+// is the length of a single edge of the square icon, in device pixels. |color|
+// is used as the fill.
+GFX_EXPORT void PaintVectorIcon(Canvas* canvas,
+                                VectorIconId id,
+                                size_t dp_size,

[sadrul, 2015/07/07 04:18:11]

We generally use 'dip_' prefix for device-independent pixels, and 'pixel_' for
physical pixels. I assume 'dp' here is the latter? If so, mind changing this to
'pixel_size'? (also applies to the new variables in throbber.cc)

[Evan Stade, 2015/07/07 16:47:50]

Done.

+                                SkColor color);
+
+}  // namespace gfx
+
+#endif  // UI_GFX_VECTOR_ICONS_H_