Introduce some util code for drawing vector assets.

ui/views/controls/image_view.cc

Index: ui/views/controls/image_view.cc
diff --git a/ui/views/controls/image_view.cc b/ui/views/controls/image_view.cc
index 4025713b6ab6cdd6d3ee2faed051ea11fba74483..5e55a15026eb0a0dd837b40054e354c491ab66d3 100644
--- a/ui/views/controls/image_view.cc
+++ b/ui/views/controls/image_view.cc
@@ -31,6 +31,8 @@ const char ImageView::kViewClassName[] = "ImageView";
 
 ImageView::ImageView()
     : image_size_set_(false),
+      vector_id_(gfx::VectorIconId::VECTOR_ICON_NONE),
+      vector_color_(SK_ColorGREEN),

[sadrul, 2015/07/07 21:45:04]

Hm, are you sure this is the right color? ;)

[Evan Stade, 2015/07/07 22:30:31]

that's the color I chose for "not set", we should never actually use this value
though.

       horiz_alignment_(CENTER),
       vert_alignment_(CENTER),
       interactive_(true),
@@ -67,19 +69,20 @@ const gfx::ImageSkia& ImageView::GetImage() {
   return image_;
 }
 
+void ImageView::SetVectorIcon(gfx::VectorIconId id,
+                              SkColor color,
+                              const gfx::Size& image_size) {
+  SetImageSize(image_size);
+  vector_id_ = id;
+  vector_color_ = color;
+}
+
 void ImageView::SetImageSize(const gfx::Size& image_size) {
   image_size_set_ = true;
   image_size_ = image_size;
   PreferredSizeChanged();
 }
 
-bool ImageView::GetImageSize(gfx::Size* image_size) const {
-  DCHECK(image_size);
-  if (image_size_set_)
-    *image_size = image_size_;
-  return image_size_set_;
-}
-
 gfx::Rect ImageView::GetImageBounds() const {
   gfx::Size image_size(image_size_set_ ?
     image_size_ : gfx::Size(image_.width(), image_.height()));
@@ -97,8 +100,7 @@ void ImageView::SetFocusPainter(scoped_ptr<Painter> focus_painter) {
 gfx::Size ImageView::GetPreferredSize() const {
   gfx::Insets insets = GetInsets();
   if (image_size_set_) {
-    gfx::Size image_size;
-    GetImageSize(&image_size);
+    gfx::Size image_size = image_size_;
     image_size.Enlarge(insets.width(), insets.height());
     return image_size;
   }
@@ -161,6 +163,7 @@ void ImageView::OnBlur() {
 void ImageView::OnPaint(gfx::Canvas* canvas) {
   View::OnPaint(canvas);
   OnPaintImage(canvas);
+  OnPaintVectorIcon(canvas);
   Painter::PaintFocusPainter(this, canvas, focus_painter_.get());
 }
 
@@ -240,4 +243,13 @@ void ImageView::OnPaintImage(gfx::Canvas* canvas) {
   last_painted_bitmap_pixels_ = GetBitmapPixels(image_, last_paint_scale_);
 }
 
+void ImageView::OnPaintVectorIcon(gfx::Canvas* canvas) {
+  if (vector_id_ == gfx::VectorIconId::VECTOR_ICON_NONE)
+    return;
+
+  DCHECK(image_size_set_);
+  canvas->Translate(ComputeImageOrigin(image_size_).OffsetFromOrigin());
+  gfx::PaintVectorIcon(canvas, vector_id_, image_size_.width(), vector_color_);
+}
+
 }  // namespace views