Add support for animations in vector icons.

ui/gfx/paint_vector_icon.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.
 
 #ifndef UI_GFX_PAINT_VECTOR_ICON_H_
 #define UI_GFX_PAINT_VECTOR_ICON_H_
 
+#include "base/time/time.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/gfx/gfx_export.h"
 #include "ui/gfx/image/image_skia.h"
 
 namespace gfx {
 
 class Canvas;
 struct VectorIcon;
 
 GFX_EXPORT extern const VectorIcon kNoneIcon;
 
 // Draws a vector icon identified by |id| onto |canvas| at (0, 0). |color| is
 // used as the fill. The size will come from the .icon file (the 1x version, if
-// multiple versions exist).
+// multiple versions exist). |elapsed_time|, when non-null, is used to determine
+// the state of any transitions the icon may define. Null is equivalent to zero
+// elapsed time.
 GFX_EXPORT void PaintVectorIcon(Canvas* canvas,
                                 const VectorIcon& icon,
-                                SkColor color);
+                                SkColor color,
+                                const base::TimeDelta* elapsed_time = nullptr);

[sadrul, 2017/05/11 04:22:55]

Make these const-refs (TimeDelta() being the default value).

[Evan Stade, 2017/05/11 16:16:26]

Done.

 
 // As above, with a specificed size. |dip_size| is the length of a single edge
 // of the square icon, in device independent pixels.
 GFX_EXPORT void PaintVectorIcon(Canvas* canvas,
                                 const VectorIcon& icon,
                                 int dip_size,
-                                SkColor color);
+                                SkColor color,
+                                const base::TimeDelta* elapsed_time = nullptr);
 
 // Creates an ImageSkia which will render the icon on demand. The size will come
 // from the .icon file (the 1x version, if multiple versions exist).
 GFX_EXPORT ImageSkia CreateVectorIcon(const VectorIcon& icon, SkColor color);
 
 // As above, but creates the image at the given size.
 GFX_EXPORT ImageSkia CreateVectorIcon(const VectorIcon& icon,
                                       int dip_size,
                                       SkColor color);
 
 // As above, but also paints a badge defined by |badge_id| on top of the icon.
 // The badge uses the same canvas size and default color as the icon.
 GFX_EXPORT ImageSkia CreateVectorIconWithBadge(const VectorIcon& icon,
                                                int dip_size,
                                                SkColor color,
                                                const VectorIcon& badge_icon);
 
 #if defined(GFX_VECTOR_ICONS_UNSAFE) || defined(GFX_IMPLEMENTATION)
 // Takes a string of the format expected of .icon files and renders onto
 // a canvas. This should only be used as a debugging aid and should never be
 // used in production code.
 GFX_EXPORT ImageSkia CreateVectorIconFromSource(const std::string& source,
                                                 int dip_size,
                                                 SkColor color);
 #endif
 
 // Calculates the size that will be default for |icon|, in dip.
 GFX_EXPORT int GetDefaultSizeOfVectorIcon(const gfx::VectorIcon& icon);
 
+// Calculates and returns the elapsed time at which all animations/transitions
+// will be finished.
+base::TimeDelta GetDurationOfAnimation(const VectorIcon& icon);
+
 }  // namespace gfx
 
 #endif  // UI_GFX_PAINT_VECTOR_ICON_H_